Communications earth & environment | 物候对气候变化的响应依赖于春季增温速率

科技   2024-11-13 00:03   贵州  

气候变化正在显著地改变物候,但关于反应速度和模式的概括性仍然有限。本研究提出了一个综合春季温度、春季升温速度和物种热需求的一般模型框架,以预测物候对变暖的响应。该框架的一个关键预测是,在春季增温速率最低的温暖地区,在春季活动较早的物种对气候变化的敏感性最强,对增温的提前响应也最大。本研究使用1850s和2010s年代收集的植物物候数据集来测试这一预测。研究结果证实了模式的预测,表明虽然温度敏感性在增温速率较低的地区较高,但物候发生的最大变化是在变暖速度最快的北部地区。本研究的框架为预测温带地区、多种植物物种和潜在的其他类群的物候敏感性和响应性提供了重要支撑。

Fig. 1 | Simple model where base temperature has been held constant, showing how temperature context (warmer versus cooler), species GDD requirements, and velocity of increasing spring temperature impact the relative timing of phe- nological events.

Fig. 2 | Distribution of phenometric estimates of leaf out and flowering onset for historical and contemporary plant species included in the study across Eastern North America. 

Fig. 3 | Effect plots for omnibus model showing scaled latitude on the x-axis and flowering and leaf-out onset timing in day of year (doy) on the y-axis in the past (18511859) and present (20102023). 

Fig. 4 | Effect plots for omnibus model showing spring mean temperature on the x-axis and flowering onset timing in day of year (doy) on the y-axis.

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