生态化学计量学
生态系统
化学计量学
营养物
开枪
陆地生态系统
磷
营养循环
生物
植物
动物科学
生态学
化学
有机化学
作者
Hongwei Xu,Qing Qu,Jiaping Yang,Zhen Wang,Minggang Wang,Rentao Liu,Sha Xue
标识
DOI:10.1016/j.still.2023.105951
摘要
Carbon (C), nitrogen (N), and phosphorus (P) stoichiometric traits are of critical importance to ecosystem functioning. Exploring the effects of drought on the C-N-P stoichiometric is of great significance for understanding element cycling and nutrient limitation in terrestrial ecosystems; however, it has not been uniformly and reliably concluded on a global scale. Here, based on 505 paired observational statistics, we systematically analyzed the effect of drought on terrestrial ecosystem C-N-P stoichiometry on the global scale. Drought greatly decreased the C:N ratio in soil (9.9%), enzymes (13.9%), shoots (7.9%), and roots (8.1%). Furthermore, soil microbes were limited by N, whereas plants were restricted by P under drought stress. Drought intensity and duration were significantly negatively correlated with shoot N:P and vector angle. Mean annual temperature (MAT) was negatively correlated with enzyme N:P and vector angle but had less effect on plant C:N:P stoichiometry. In conclusion, heavy drought intensity and long duration attenuated the P limitation in the shoot but enhanced the microbial N limitation.
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