24年11月17日文献情报（17篇）

24年11月17日文献情报

1. 题目: Improving rice quality through biochar application in China: A meta–analysis

文章编号: N24111717
期刊: Journal of Environmental Management
作者: Hui He, Li Long, Zhiqiang Fu
更新时间: 2024-11-17
摘要: This research investigates the effects of biochar application on rice quality through a comprehensive meta-analysis, aiming to elucidate the ambiguous impacts of biochar on rice quality indicators and providing a comprehensive quantitative evaluation to inform sustainable agricultural practices and the practical application of biochar in rice cultivation.
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2. 题目: Grass clippings to biochar: A promising soil amendment for sustainable agriculture under drip irrigation

文章编号: N24111716
期刊: Journal of Environmental Chemical Engineering
作者: Yesid Murillo-Acevedo, Carlos A Grande
更新时间: 2024-11-17
摘要: Soil fertilization is commonly used to improve soil quality for enhanced agricultural production. Biochar has attracted attention due to its ability to improve soil fertility and decrease the requirements of multinutrient inorganic fertilizers that contribute to greenhouse gas emissions. This work assesses the effect of pyrolysis conditions on the physical and chemical properties of biochar derived from green waste, specifically St. Augustine grass (Stenotaphrum secundatum). The biochar has varying surface areas ranging from 24 to 187 m²/g and surface chemistry with a greater content of the basic groups. The results indicate that potassium and phosphorus can leach from biochar via different mechanisms, confirming that biochar has the potential to be used as fertilizer. Biochar loaded with NPK fertilizer changed the leachate mechanism and improved some chemical properties. Finally, the drip irrigation experimental setup proposed for evaluating ion leachate in biochar approximates an actual agricultural system.
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3. 题目: Iron and nitrogen co-doped biochar membrane for SMX removal in water by filtration and catalytic oxidation

文章编号: N24111715
期刊: Separation and Purification Technology
作者: Hongyu Liu, Fengqing Xin, Xin Wen, Huan Zhang, Huicai Wang, Junfu Wei
更新时间: 2024-11-17
摘要: Iron and nitrogen co-doped biochar membrane (Fe/N/BC membrane) was fabricated. Epoxy resin was used as a binder, 4,4́-diaminodiphenylmethane as curing agent, and polyethylpyrrolidone as pore-making agent, respectively. The Fe/N/BC membrane showed excellent performance of filtration and catalytic oxidative removal of sulfamethoxazole (SMX) in water and its water flux was 127 L·m⁻²·h⁻¹·bar⁻¹. The Fe/N/BC membrane had a good application prospect in a wide pH range (both acidic and neutral conditions). The contribution of Fe doping was higher than that of N doping in the SO₄^{• −} and ·OH radicals generation pathways but the contribution of N doping is higher than that of Fe doping for the ¹O₂ non-radical generation pathway. Finally, the membrane facilitates the recovery of catalytic materials and solves the problem of secondary pollution to the environment. This study provides an important practical prospect for efficient and rapid removal of SMX in water.
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4. 题目: Selective upgrading coal-based humic acid to fulvic acid through electrochemical oxidation coupled with hydrogen production

文章编号: N24111714
期刊: Separation and Purification Technology
作者: Jining Zhou, Haiyan Ge, Zhicai Wang, Chunxiu Pan, Xiaobiao Yan, Zhanku Li, Weidong Zhang, Honglei Yan, Jingchong Yan, Shibiao Ren, Zhiping Lei, Hengfu Shui
更新时间: 2024-11-17
摘要: This study presents an efficient approach to selectively upgrade coal-based humic acid (CBHA) from depolymerized lignite to fulvic acid (FA) while co-producing H₂ via electro-catalytic oxidation using NiCoOOH supported on nickel foam (NF) as the anode. In comparison, the prepared NiCoOOH/NF demonstrated a superior electro-catalytic oxidation performance than NiCuOOH/NF, NF, and Pt. The results showed that a 50.30 % conversion of CBHA with FA selectivity exceeding 85 % was achieved by conducting electrolysis in 1 mol/L KOH at 1.42 V (vs. RHE) for 2 h, meanwhile H₂ was produced with a Faradaic efficiency (FE) of 98 % at the cathode. Following this, a series of analytical techniques including SEM, XRD, CV, and LSV were utilized to characterize the structure and electrochemical performances of NiCoOOH/NF. Based on the results from ESI FT-ICR/MS, MALDI TOF/MS, and ¹³C NMR, the degradation of CBHA involves oxidative ring-opening of aromatic nuclei, which leads to the formation of polycarboxylic acids, including aromatic and aliphatic carboxylic acids. Overall, this study introduces a highly efficient and selective electro-oxidation upgrading strategy, presenting a promising method for the low-carbon and high-value utilization of lignite and its CBHA.
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5. 题目: Artificial humic acid mediated Fe(II) regeneration to restart Fe(III)/PMS for the degradation of atrazine

文章编号: N24111713
期刊: Separation and Purification Technology
作者: Shishun Wang, Shuang Gai, Kui Cheng, Zhuqing Liu, Markus Antonietti, Fan Yang
更新时间: 2024-11-17
摘要: The degradation efficiency of organic contaminants using Fenton-like system based on Fe(II) and peroxymonosulfate (PMS) has been hindered by the rapid transformation from Fe(II) to Fe(III) and the slow regeneration of Fe(II). To address this challenge, artificial humic acid (AHA) derived from biomass was incorporated into Fe(III)/PMS system to build AHA/Fe(III)/PMS system. The results demonstrated that the degradation rate of atrazine (ATZ) in AHA/Fe(III)/PMS system (98.83 %) is significantly superior to those in Fe(III)/PMS (16.51 %) and AHA/PMS system (41.76 %) within 90 min. Furthermore, Fe(II) measurement experiments revealed that AHA exhibited more significant iron-reducing potential. The analysis of FTIR, 3D-EEM, and liquid NMR indicated that AHA possessed more structures with reductive potential in comparison to commercial humic acid (CHA) and humic acid extracted from lignite (LHA). The results of persistent free radical indicated that CHA possessed oxidative potential, which also accounted for the lowest Fe(II) concentration in those system containing CHA. Furthermore, quenching experiments, EPR analysis, and PMSO probe analysis have indicated the presence of reactive species such as •OH, SO₄^•-, and Fe(IV) within AHA/Fe(III)/PMS system. The degradation products from ATZ were identified and determined to exhibit reduced toxicity relative to parent compound. Collectively, these findings presented an in-depth understanding to reactivate Fe(III)/PMS system, offering a promising alternative strategy for efficient degradation of organic pollutants in water treatment processes.
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6. 题目: Relationships between the spectral characteristics of dissolved organic matter and river ecological health indicators: A case study in the Shichuan River basin on a typical semi-arid and semi-humid region of China

文章编号: N24111712
期刊: Ecological Indicators
作者: Daoping Xi, En Hu, Ming Li, Jian Gao
更新时间: 2024-11-17
摘要: The spectral characteristics of dissolved organic matter (DOM) in rivers are considered as potential indicators of river health status. In this study, relationships between DOM spectral properties and river ecological health indicators in Shichuan River, such as total nitrogen (TN), total phosphorus (TP), chlorophyll-a (Chl-a) content, diversity of macrobenthic invertebrates, water quality index (WQI), and trophic level index (TLI), etc., were investigated. According to the WQI values, the water quality of the Ju River and Taoqupo Reservoir was generally better than that of other river sections, while the Qinghe and the mainstream sections performed the worst. The fluorescence index (FI) and WQI reflects that the mainstream of the Shichuan River bears a significant amount of sewage input. Besides, FI showed a significant positive correlation with nitrate nitrogen (NO3⁻-N), TN, TP, Chl-a, and TLI, while a significant negative correlation with WQI. The specific ultraviolet absorbance of 254 nm (SUVA254) had a positive correlation with TLI. Indeed, the UVC humic-like component (C1) showed a significant positive correlation with the macroinvertebrates diversity. The humification index (HIX) was significantly negatively correlated with sediment pollution index. Our results suggested that DOM fluorescence characteristics had the potential to be developed as a convenient method for assessing aquatic ecological health.
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7. 题目: Improving the accuracy of soil organic matter mapping in typical Planosol areas based on prior knowledge and probability hybrid model

文章编号: N24111711
期刊: Soil and Tillage Research
作者: Deqiang Zang, Yinghui Zhao, Chong Luo, Shengqi Zhang, Xilong Dai, Yong Li, Huanjun Liu
更新时间: 2024-11-17
摘要: The use of remote sensing techniques for mapping soil organic matter (SOM) in black soil regions is well established. However, in areas where Planosols are interspersed with non-Planosols, tilling impacts the soil spectra of tilled soils at varying times and to different extents. As a result, errors may arise when modeling Planosols and non-Planosols collectively using conventional methods. This study developed a probability hybrid model specifically designed for the interlayered zones of Planosol and non-Planosol soils to accurately reflect the content and spatial distribution of SOM. A total of 712 topsoil samples were collected from the 852 Farm, a typical area with the interlayered zones of Planosol and non-Planosol soils in northeastern China. Cloud-free Sentinel-2 images were obtained during the bare soil period from April to May between 2021 and 2023. The spatial distribution of Planosol was detected, and the probability of soil classification was calculated using a random forest model. Based on soil classification probabilities, global models, multi-temporal ordinary hybrid models, and multi-temporal probability hybrid models were developed respectively. The results of SOM mapping using these different strategies were compared. Under seasonal reductive leaching, Planosol exhibits a distinct eluvial horizon beneath the topsoil. Long-term tilling leads to the mixing of this eluvial horizon with the topsoil in Planosol, resulting in spectral characteristics that differ significantly from those of other soil types. Accordingly, we propose a new remote sensing index—the Normalized Difference Planosol Index (NDPI), to reflect the upturning degree of the eluvial horizon and get “whiteness degree” information. We evaluated the effect of adding this index as an input on the detection of Planosol and the accuracy of SOM mapping. The results of the study show that (1) May is the optimal time window for SOM mapping and Planosol detection in the typical interlayered area of Planosol and non-Planosol soils. (2) Based on the random forest model combined with multi-period May bare soil images can accurately detect the spatial distribution of Planosol with the highest accuracy, the overall accuracy is 97.66 %; (3) The hybrid models outperform the global model, with the probability hybrid model achieving the highest accuracy (R²=0.8056, RMSE=4.2869 g/kg) and the mapping is more continuous and smoother. (4) The inclusion of NDPI improves the accuracy of Planosol spatial distribution detection and SOM mapping in Planosol areas, resulting in an increase in the Kappa coefficient by 0.0168 and an improvement in R² by 0.0122. The present study innovatively utilizes remote sensing imagery to monitor Planosol, thus expanding the application of remote sensing technology in digital soil mapping.
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8. 题目: Long-term effects of thinning on soil organic carbon fractions and carbon pool management indices in secondary forests of heavily burned areas.

文章编号: N24111710
期刊: Journal of Environmental Management
作者: Haixing Li, Xiuling Man, Tijiu Cai
更新时间: 2024-11-17
摘要: Despite decades of recovery, soil carbon in heavily burned areas has failed to reach pre-fire levels. It is unclear whether stand management practices can promote soil organic carbon accumulation at such sites. This study evaluated the changes in soil labile organic carbon (LOC) fractions (including dissolved organic carbon (DOC), microbial biomass carbon (MBC), and easily oxidizable organic carbon (EOC)) and the carbon pool management index (CPMI) after the thinning of a heavily burned area in the Daxing'an Mountains and selected sample plots. This study compared thinned birch secondary forests (17 years (17a-S), 14 years (14a-U), 2 years (2a-S) post-thinning, where 17a-S and 2a-S were strip thinned and 14a-U was uniform thinned) with unthinned control (CK) plots. The contents of soil LOC and CPMI at a depth of 0-10 cm were found to increase with thinning, indicating that thinning promoted the accumulation of soil organic carbon in secondary forests in heavily burned areas. The two-way ANOVA showed that the differences in C fractions and CPMI at different times after thinning were significant, whereas the differences between thinning methods were not significant. In comparison to CK, only the DOC content was found to be significantly elevated at 2a-S. However, at both 14a-U and 17a-S, the elevation of the LOC fraction content reached a significant level. Among them, 14a-U demonstrated the most pronounced improvement (DOC (+11.37%), MBC (+42.80%), and EOC (+19.51%)). The CPMI at the 0-10 cm depth also increased significantly (18.20% ∼ 27.77%) at 14a-U. The study revealed that soil bulk density and understorey vegetation biomass were the main influences on the changes in soil LOC fractions and CPMI post-thinning. This finding also indicates that greater attention should be given not only to the soil itself but also to the understorey vegetation during forest soil carbon restoration under conservation management.
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9. 题目: Improved soil organic matter monitoring by using cumulative crop residue indices derived from time-series remote sensing images in the central black soil region of China

文章编号: N24111709
期刊: Soil and Tillage Research
作者: Mei-Wei Zhang, Xiao-Lin Sun, Mei-Nan Zhang, Hao-Xuan Yang, Huan-Jun Liu, Hou-Xuan Li
更新时间: 2024-11-17
摘要: Soil organic matter (SOM) determines soil fertility and functions, playing a key role in agriculture, the environment and climate change. During the past century, the SOM of the world, e.g., the black soil (Mollisol) in croplands of Northeast China, experienced extensive changes, making SOM monitoring crucial. Recently, digital soil mapping (DSM) with time-series remote sensing images has become a mainstream method for SOM monitoring, but there is room for its accuracy to be improved. To fulfill this purpose, we propose utilizing crop residue indices (CRIs) derived from remote sensing images within the method, as crop residues are a main source of the SOM. In this study, performances of five commonly used CRIs, e.g., normalized difference tillage index (NDTI), on SOM monitoring was evaluated based on a series of topsoil samples collected from 2014 to 2018 in croplands of the center black soil region in Northeast China. The performances and those of cumulative CRIs computed over some years were compared to those of basic climate and terrain attributes, spectral bands, an empirical index, and commonly used vegetation indices (VIs, e.g., normalized difference vegetation index (NDVI)). Results showed that temporal CRIs had a stronger correlation with SOM content (0.52–0.73) than did the others (0.04–0.69). Integrating CRIs with basic soil covariates increased prediction accuracy by 7.27 % in Lin’s concordance correlation coefficient (CCC). Further, the CRIs and VIs accumulated over 3 and 4 years, respectively, had a much stronger correlation with SOM (0.65–0.73 and 0.67–0.69, respectively) and led to better accuracies with an average increase of 2.62 % in CCC compared to indices of the current sampling year. While annual SOM maps predicted with and without the optimal cumulative CRI showed similar spatial patterns, they were statistically significantly different. It is recommended to utilize the cumulative NDTI for monitoring SOM.
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10. 题目: Soil mineral–associated organic carbon fraction maintains quantitatively but not biochemically after cropland abandonment

文章编号: N24111708
期刊: Soil and Tillage Research
作者: Bin Jia, Yanmei Liang, Xiaoming Mou, Han Mao, Li Jia, Jie Chen, Kuzyakov Yakov, Xiao Gang Li
更新时间: 2024-11-17
摘要: Abandonment is a strategy applied to increase soil organic C (SOC) in degraded cropland, but such efforts may fail because of microbial N limitation after abandonment in the absence of fertilization. In this study, we investigated the associations between SOC and microbial necromass C (MNC) dynamics in bulk soil and particle-size pools with N availability in a cropland abandonment chronosequence on the Loess Plateau. The total SOC, total MNC, and their particulate fractions (> 0.05 mm) in soil declined in the first eight years after cropland abandonment, but increased thereafter. By the 23rd year, the SOC content in abandoned soils increased towards the levels of cropland (16.5 g kg^–1) but were still far lower than those of natural vegetation (21.5 g kg^–1). The mineral–associated SOC (< 0.05 mm) content maintained after abandonment; but by contrast, the mineral-associated MNC profoundly decreased. This indicated that the reduction in MNC in this fraction was compensated for by plant-derived substances from the particulate fraction. Enzymatic stoichiometry analysis identified microbial N limitations in abandoned soils compared with cropland soils. As such, microbial N limitation led to increases in mineralization and/or decreases in synthesis of MNC in both particulate and mineral-associated fractions after abandonment, attributable to the decreased total SOC. Across the abandonment chronosequence, up to 20 % of particulate SOC was derived from microbes, whereas more than half of mineral-associated SOC came from plants. These findings challenge the general consensus that particulate SOC is dominated by plant residues whereas the mineral-associated fraction contains mainly microbially derived substances. The MNC contained a smaller proportion of fungal substances in mineral-associated fractions compared to particulate fractions, reflecting microbial ecological niche differentiation in the SOC formation between particle-size fractions. In conclusion, cropland abandonment decreased MNC accumulation because of microbial N limitation, and the mineral-associated SOC was stable in quantity but not in its source composition.
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11. 题目: Molecular-scale investigation on the photochemical transformation of dissolved organic matter after immobilization by iron minerals with FT-ICR MS.

文章编号: N24111707
期刊: Environmental Science: Processes & Impacts
作者: Yongcan Jiang, Yi Wang, Yinlong Shao, Dong Yang, Minli Guo, Yu Wen, Hong Tang, Guanglong Liu
更新时间: 2024-11-17
摘要: The interaction between dissolved organic matter (DOM) and iron minerals has a significant effect on its stabilization and preservation in the environment. In this study, iron minerals with different crystal forms (crystalline goethite and amorphous ferrihydrite) were selected to investigate the photochemical transformation process for DOM immobilized on iron minerals under simulated sunlight irradiation at the molecular scale with the help of Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The results showed that a total of 7148 molecules were detected in alkaline-extractable sedimentary DOM, of which 38.8% and 36.2% were adsorbed by ferrihydrite and goethite, respectively, while there was no selectivity difference between the two iron minerals in terms of DOM adsorption. After simulated sunlight irradiation, the DOM adsorbed by goethite was significantly degraded (58.3%), in which the H/C ratio of the mineral-immobilized DOM increased and the O/C ratio decreased, and the photodegradation primarily involved DOM molecules with high Kendrick mass defect (KMD) values. The results confirmed that the iron mineral types play an important role in the transportation and transformation of DOM, which adds to the understanding of the fate of DOM in natural environments.
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12. 题目: Dissolved organic matter quality, hydrological connectivity and microbial activity shape phosphorus buffering in river-floodplain systems.

文章编号: N24111706
期刊: Science of the Total Environment
作者: Michele Meyer, Matthias Koschorreck, Markus Weitere, David Kneis, Nuria Perujo
更新时间: 2024-11-17
摘要: High loads of nutrients like phosphorus (P) persistently degrade water quality in floodplain waterbodies and cause eutrophication, i.e., elevated algae production. Despite continuous efforts to curb external nutrient loads entering freshwaters, internal P release from sediments frequently sustains eutrophication. Benthic microbial communities considerably impact nutrient turnover through the mineralisation of organic matter and may strongly affect P retention and release, which can be estimated via the P buffering potential. However, how these microbial processes shape the P buffering potential in hydrologically dynamic systems like floodplains is poorly understood. Here, we assessed the coupled effects of lateral hydrological connectivity, dissolved organic matter (DOM) quality and benthic microbial activity on the P buffering potential in a river-floodplain system. We examined seven sites in shallow floodplain waterbodies that were either connected or disconnected from the River Elbe (Magdeburg, Germany) after a summer contraction phase. Our findings show a significantly higher P buffering potential and thus, likely higher P release risk within connected sites, corroborated by distinct microbial community-level physiological profiles. The P buffering potential was positively correlated with more labile, low molecular weight DOM quality, increased autochthonous contribution, and a pronounced enzymatic degradation of hemicellulose (β-xylosidase activity). Our study underscores the pivotal role of hydrological connectivity, DOM quality and microbial enzyme activity in shaping sediment P buffering and potential P release in river-floodplain systems. Moreover, our results demonstrate the importance of critical yet often overlooked benthic sediment processes and microbe-organic matter interactions for P dynamics in floodplain waterbodies.
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13. 题目: Recent advance on application of biochar in remediation of heavy metal contaminated soil: Emphasis on reaction factor, immobilization mechanism and functional modification

文章编号: N24111705
期刊: Journal of Environmental Management
作者: Wenpei Guo, Xin Yao, Zhuo Chen, Ting Liu, Wei Wang, Shujun Zhang, Jiuqin Xian, Yuehu Wang
更新时间: 2024-11-17
摘要: Soil contamination with heavy metals (HMs) poses a critical environmental challenge that demands immediate attention and resolution. Among the various remediation techniques, biochar emerges as an environmentally friendly option with obvious advantages. Biochar can be obtained by pyrolysis of various biomass and has significant effects in the remediation of heavy metal pollution contaminated soil. In this study, we examined 3489 articles on biochar-based remediation of soil heavy metal contamination published between May 2009 and October 2023, utilizing the Web of Science core collection database. Based on bibliometric methods and big data statistical analysis, CiteSpace visualization software is utilized to create a knowledge map of biochar research, allowing for an analysis of keyword clustering and a summary of the current research hotspots and development trends. Furthermore, this review emphasizes factors influencing the characteristics of biochar, including raw material types, pyrolysis temperature and pyrolysis method. At the same time, the optimal conditions for producing biochar are also presented. Additionally, the mechanisms of biochar remediation for heavy metal contaminated soil are introduced in detail, including electrostatic attraction, ion exchange, physical adsorption, surface complexation and precipitation. Meanwhile, the modification and combined effects of biochar are also reviewed. Finally, the advantages and potential risks of using biochar are explored. It is aims to serve as a reference for subsequent research and promote the application of environmental remediation technologies in polluted soils.
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14. 题目: Effects of land use and dissolved organic matter on pCO2 are dependent on stream orders and hydrological seasonality in a low-order karst river.

文章编号: N24111704
期刊: Science of the Total Environment
作者: Yongmei Ma, Maofei Ni, Shijie Gu, Liuqing Zhang, Huaiwei Sun, Wei Tang, Siyue Li
更新时间: 2024-11-17
摘要: Human activities and stream accumulation influence carbon loadings, altering the distributions and characteristics of dissolved inorganic and organic carbon in rivers. It is widely recognized that such alterations affect dissolved organic matter (DOM) components, water environment and river carbon dioxide (CO2) degassing, however, the control factors by which land use/land cover (LULC) and DOM components regulate the partial pressure of CO2 (pCO2) are unclear. Here, in the Daning karst river system, an extensive investigation was presented to investigate the role of LULC and DOM components in influencing the spatial and temporal variability of pCO2, as well as to investigate the regulating effect of stream order and hydrological rhythm on this influence. DOM quality and pCO2 levels exhibited significant spatial and temporal variations. In the 3rd - 4th order streams, pCO2 was correlated with protein and lignin compounds in the wet period and with DOM molecular weight in the dry period. Relatively high protein-like components (54.83 % ~ 71.84 %, on average) and biological index (0.86-0.90, on average) indicated notable autochthonous processes. Significant relationships between pCO2 and water quality parameters were observed in the 3rd - 4th order streams in the wet period, demonstrating the role of runoff and upstream accumulation. Farmland increased pCO2 levels in the 3rd - 4th order streams, whereas forests could potentially mitigate river CO2 saturation. River pCO2 was well predicted by LULC under extended circular buffers (1000 and 2000 m in diameter). This study demonstrated that DOM and LULC directly or indirectly affect pCO2 and that the influences are largely regulated by hydrological seasonality and stream orders, which is better for understanding aquatic CO2 drivers.
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15. 题目: Development of sustainable strawberry production in closed cultivation systems: Effects of bagasse biochar on morphological and physiological attributes, yield and autotoxic changes

文章编号: N24111703
期刊: Journal of Environmental Management
作者: Narges Aali, Naser Alemzadeh Ansari, Seyed Morteza Zahedi
更新时间: 2024-11-17
摘要: Strawberry is considered one of the most important small fruits with a high nutritional content. Nowadays, it is cultivated globally using various greenhouse cultivation techniques, adapting to different climatic conditions. Meanwhile, it is essential to address challenges in closed hydroponic systems and finding effective solutions to enhance the production and to lower the level of autotoxin materials in the root substrate. An experiment was conducted to examine the response of three commercial strawberry cultivars (Paros, Camarosa, and San Andreas) to the application of biochar (0 and 5%) under a closed hydroponic system. The parameters examined in this study included growth and yield, gas exchange indicators, photosynthetic pigments, some fruit biochemical attributes, and the level of benzoic acid in the runoff. The interaction effect of the cultivar and biochar revealed that the Paros cultivar cultivated in a biochar medium exhibited the highest values for total chlorophyll content (50.83 mg g⁻¹ FW), fruit number (11.66), fruit weight (17 g), yield (198.59 g plant⁻¹), and antioxidant capacity (49.32%). Meanwhile, the San Andreas cultivar, cultivated in a biochar medium, displayed the highest firmness (7.11 N), TA (0.97 mg CA 100 g⁻¹ FW), TSS (10.83%), pH (4.11), and vitamin C (17.35 mg AA 100 g⁻¹ FW), while in the absence of biochar, it had the highest Zn content (0.50 mg kg⁻¹). The Camarosa cultivar cultivated in biochar substrate presented the highest Fe (9 mg kg⁻¹) level. Additionally, the application of biochar led to a reduction in benzoic acid concentration in the runoff water compared to non-biochar approach. Overall, selecting an appropriate cultivar and application of biochar in closed hydroponic systems can reduce autotoxicity, thus enhancing growth and yield.
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16. 题目: Investigation of nitrogen conversion in ditch-treated greywater: Contributions of biochar and aeration

文章编号: N24111702
期刊: Journal of Environmental Chemical Engineering
作者: Ronggao Qin, Meidan Lai, Guangzhu Cao, Yi Qiang, Wan Xu, Yiming Xie, Rui Zuo, Kexue Han
更新时间: 2024-11-17
摘要: This study aimed to assess the contribution of different combinations of uninterrupted aeration and tidal flow modes, as well as shallow and deep biochar landfill methods, to nitrogen removal pathways in ditches. Compared to natural ditches, the addition of biochar and aeration resulted in higher water pollution removal rates, lower Greenhouse Gas (GHG) emissions, and reduced sediment leaching. The nitrogen mass balance revealed that Total Nitrogen removal efficiency of each ditch group was 25.33% for CA-C, 43.75% for DBT-C, 49.08% for UBT-C, 30.75% for DBA-C, and 45.16% for UBA-C. Compared to the control group (CA-C), the tidal flow group with deep biochar landfill (DBT-C)demonstrated the highest efficiency in total nitrogen removal. To elucidate the fate of nitrogen elements, potential transformation processes of unexplained nitrogen were explored. The primary outflow pathway of nitrogen pollution in ditches is through liquids. The nitrogen composition in the liquid of each ditch indicated that for shallow biochar configurations (UBT-C/UBA-C), denitrification might be the main factor limiting TN removal efficiency. In contrast, for deep biochar configurations (DBT-C/DBA-C), hydrolysis and nitrification of organic nitrogen were identified as limiting factors, with tidal flow alleviating these limitations. Overall, the combination of shallow biochar and tidal flow aeration in a ditch is the most effective method for removing rural greywater, providing valuable insights for the development of design parameters in greywater removal systems.
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17. 题目: Eco-friendly, stable, and high-performance biochar prepared by a twice-modification scheme: Saccharification of raw materials & thermal air oxidation of biochar

文章编号: N24111701
期刊: Journal of Environmental Management
作者: Yundong Liu, Bu Li, Wang Kai Tong, Han Tang, Zhaoli Ping, Wenjuan Wang, Min-tian Gao, Chaomeng Dai, Nan Liu, Jiajun Hu, Jixiang Li
更新时间: 2024-11-17
摘要: Organic pollutants, such as phenolic compounds, pose significant risks to both the environment and human health. While biochar is an effective adsorbent for removing these pollutants, its dissolved solid (DS) components can lead to the loss of functional groups, structural disintegration, unstable performance, and environmental issues. This study introduces a twice-modification scheme designed to produce a biochar (BC-M) that combines high stability with superior performance. The process begins with the preparation of a stable biochar from cellulase-treated lignocellulose. This precursor biochar is then subjected to thermal air oxidation to enhance its oxygen-containing functional groups, thereby improving its adsorption capabilities. A mathematical model was developed to explore the relationship between different thermal air oxidation conditions and the properties of BC-M, aiming to optimize both adsorption capacity and DS. The model's multi-objective optimization indicated the optimal modification conditions. Compared to unmodified biochar (BC-O), BC-M showed significant improvements: its specific surface area increased by 63.6%, pore volume by 139%, and functional groups by 50%–1271%. Notably, the DS of BC-M was reduced to just 1.08 mg/L, representing a 97.5% reduction from BC-O, with a minimal mass loss of only 0.78 ± 0.45% during modification. BC-M also demonstrated a remarkable enhancement in the adsorption of phenolic compounds, with a capacity 21%–2408% higher than BC-O. Furthermore, calculations indicated that BC-M could reduce carbon emissions by 0.70 t CO2/yr/t, outperforming activated carbon in this regard. This study offers valuable insights into biochar modification, providing a low-cost, high-stability, and high-efficiency alternative for environmental cleanup.
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