Chen Shuifei, Zhang Wenwen, Ge Xiaomin, Zheng Xiao, Zhou Xu, Ding Hui, Zhang Aiguo
Nanjing Institute of Environmental Sciences, State Environmental Protection Scientific Observation and Research Station for Ecological Environment of Wuyi Mountains, State Environmental Protection Key Laboratory on Biosafety, Ministry of Ecology and Environment of China, Nanjing 210042, China.
Plants (Basel). 2023 May 25;12(11):2104. doi: 10.3390/plants12112104.
Nitrogen (N) and phosphorus (P) are key elements essential for plant growth and development. Due to fertilizer application, rapid urbanization, and fossil fuel combustion, nitrogen deposition has reached relatively high levels in China. However, there is still uncertainty regarding the response of N:P stoichiometry in plants and soil to N deposition across different ecosystems. Therefore, a meta-analysis was conducted using 845 observations from 75 studies to evaluate the response of plant and soil N and P concentrations and N to P ratios across various ecosystems to N addition. The analysis revealed that N concentration and N:P stoichiometry in plants and soil increased under N addition, while P concentration in plants and soil decreased on average. Furthermore, the magnitude of these responses was related to the N input rate and experimental duration. Finally, the effects of N addition on N concentration, P concentration, and N:P in terrestrial ecosystems would alter their allocation patterns, depending on relevant climate factors such as mean annual temperature and mean annual precipitation. This study highlights the ecological impact of N addition on the biogeochemical cycling of major elements (N and P) in terrestrial ecosystems in China. These findings are necessary for improving our understanding of the characteristics of plant ecological stoichiometry and helping to plan measures for increasing N deposition.
氮（N）和磷（P）是植物生长发育所必需的关键元素。由于施肥、快速城市化和化石燃料燃烧，中国的氮沉降已达到相对较高的水平。然而，不同生态系统中植物和土壤的氮磷化学计量比（N:P）对氮沉降的响应仍存在不确定性。因此，利用来自75项研究的845个观测数据进行了一项荟萃分析，以评估不同生态系统中植物和土壤的氮、磷浓度以及氮磷比（N:P）对氮添加的响应。分析表明，添加氮后，植物和土壤中的氮浓度以及氮磷化学计量比增加，而植物和土壤中的磷浓度平均下降。此外，这些响应的幅度与氮输入速率和实验持续时间有关。最后，氮添加对陆地生态系统中氮浓度、磷浓度和氮磷比的影响将改变它们的分配模式，这取决于年平均温度和年平均降水量等相关气候因素。本研究突出了氮添加对中国陆地生态系统中主要元素（氮和磷）生物地球化学循环的生态影响。这些发现对于增进我们对植物生态化学计量特征的理解以及帮助制定应对氮沉降增加的措施是必要的。
