区域碳(C)、氮(N)、磷(P)化学计量格局的信息多见于个体水平，植物在群落水平上是否存在与个体类似的化学计量关系目前仍不清楚。本项目拟选择鄱阳湖湿地典型区-赣江三角洲前缘地带，于植物生长季沿水位梯度对常见植物群落进行调查与样品采集，并结合优势植物群落年际动态监测与N、P添加试验，开展湿地植物群落C、N、P化学计量格局与内稳性研究，在时间和空间两个维度上阐明水位变化对鄱阳湖湿地植物群落优势种与伴生种以及群落地上与地下部分C、N、P化学计量特征的影响；探讨个体水平与群落水平的化学计量差异；揭示鄱阳湖高动态水情环境下发育的湿地植物群落结构与稳定性维持的化学计量学机制。项目研究结果不仅有助于理解鄱阳湖湿地植物对水位变化的适应机制，还将对气候变暖与湿地干旱化趋势下的生物多样性保护与退化湿地的恢复具有重要参考价值。

Researches on regional spatial-temperoal stoichiometric patterns in foliar carbon,nitrogen and phosphorus were concentrated at individual level, however, C:N:P stoichiometry at community level was still poorly understood. In this study, the typical Poyang lake wetland located at the front edge of Ganjiang delta will be selected as research sits.Subsequently,the plant communities investigation will be conducted along water table gradient in growing season. Combined with dynamic monitor of dominant plant communities, as well as field nitrogen and phosphorus addition experiment, C:N:P stoichiometric patterns and homeostasis of wetland plant communities will be studied. The objectives of this study are :1) to clarify effects of water table changes on C:N:P stoichiometry in dominant and non-dominant plant species, as well as aboveground and belowground parts of communities both at temporal and spatial scales. 2) to discuss the C:N:P stoichiometric difference between individual and community level. 3) to reveal the stoichiometric mechanism responsible for the structure and stability of plant communities developed in Poyang lake wetlands with drastic water table fluctuations. The results of this study will not only help to understand the adaptation of wetland plants to water table fluctuation, but also provide valuable references for biodiversity protection and degraded wetland restoration in the context of climate warming and wetland drought.