土壤碳循环|Geoderma：CAZyme家族调控毛乌素沙地植被恢复过程中土壤有机碳组成的变化

原名：The CAZyme family regulates the changes in soil organic carbon composition during vegetation restoration in the Mu Us desert

译名：CAZyme家族调控毛乌素沙地植被恢复过程中土壤有机碳组成的变化

发表期

2023年影响因子：6

5年影响因子：5.6

第一作者：Zhouchang Yu

通讯作者：Wei Zhang, Peizhi Yang

第一单位：西北农林科技大学草业与草原学院

本研究选取中国毛乌素沙漠东部四种不同植被类型的土壤，即草原化沙漠（GD）、荒漠草原（DS）、典型草原（TS）和人工林（AF），测定了其理化性质、碳组分、微生物群落组成和CAZyme基因丰度。

Fig. 1. Situation of the research area. GD: grassland desert; DS: desert steppe; TS: typical steppe; AF: artificial forest.

Table 1 The content and composition of soil organic carbon.

Note: GD: grassland desert; DS: desert steppe; TS: typical steppe; AF: artificial forest; Polysaccharide-C: polysaccharide carbon; Methyl-C: methyl carbon; Aromatic-C: aromatic carbon; Carboxylic-C: carboxylic carbon; Aliphatic-C: aliphatic carbon; LC: labile carbon, including polysaccharide carbon, methyl carbon, and aliphatic carbon; RC: recalcitrant carbon, including aromatic carbon and carboxylic carbon. Different lowercase letters indicate significant differences between different vegetation types (p <0.05, ANOVA).

Fig. 2. The abundance of selected GHs and AAs encoding the decomposition of the plant-, fungi-, and bacteria-derived components in different vegetation types of soil. (a) plant-derived cellulose decomposotion; (b) plant-derived hemicellulose decomposition; (c) plant-derived lignin decomposition; (d) fungi-derived chitin decomposition; (e) fungi-derived glucans decomposition; (f) bacteria-derived peptidoglycan decomposition. GD, grassland desert; DS, desert steppe; TS, typical steppe; AF, artificial forest. Different lowercase letters indicate significant differences between different vegetation types (p < 0.05).

Fig. 3. Contribution of microbial (bacterial and fungal) phyla to microbial CAZyme genes for plant-and microbial-derived components decomposition in different vegetation types of soil. (a) contribution of microbial (bacterial and fungal) phyla to plant-derived cellulose decomposotion. (b) contribution of microbial (bacterial and fungal) phyla to plant-derived hemicellulose decomposition. (c) contribution of microbial (bacterial and fungal) phyla to plant-derived lignin decomposition. (d) contribution of microbial (bacterial and fungal) phyla to fungi-derived chitin decomposition. (e) contribution of microbial (bacterial and fungal) phyla to fungi-derived glucans decomposition. (f) contribution of microbial (bacterial and fungal) phyla to bacteria-derived peptidoglycan decomposition.

Fig. 4. Redundant analysis and interpretation ranking chart of the impact of soil carbon components on microbial community composition. *P < 0.05, **P < 0.01 (Monte Carlo permutation test). GD, grassland desert; DS, desert steppe; TS, typical steppe; AF, artificial forest. Polysaccharide-C: ploysaccharide carbon; Methyl-C: methyl carbon; Aromatic-C: aromatic carbon; Carboxylic-C: carboxylic carbon; Aliphatic-C: aliphatic carbon; LC: labile carbon; RC: recalcitrant carbon.

Fig. 5. The relationship between soil physicochemical properties and CAZymes gene abundance and microbial community composition. *P < 0.05, **P < 0.01, ***P < 0.001. Cellulose: CAZymes for plant-derived carbon; Hemicellulose: CAZymes for plant-derived hemicellulose; Lignin: CAZymes for plant-derived lignin; Chitin: CAZymes for fungi-derived chitin; Glucans: CAZymes for fungi-derived glucans; Petidoglycan: CAZymes for bacteria-derived petidoglycan; Microbial community composition: relative abundance of microorganisms at the phylum level; MOISTURE: soil moisture content; SOC, soil organic carbon; STN, soil total nitrogen; STP, soil total phosphorus; MBC: microbial biomass carbon; MBN: microbial biomass nitrogen; MBP: microbial biomass phosphorus.

Fig. 6. Partial least squares path models (PLS-PM) of the drivers of soil carbon components. The asterisks denote statistically significant differences (*p < 0.05, **p < 0.01). Numbers on arrows are path coefficients indicating a positive (blue) or negative effect (red). Soil nutrition: soil organic carbon, soil total nitrogen and soil total phosphorus.