亚热带常绿阔叶林优势树种碳水过程对持续干旱事件的响应与恢复机制

未来极端干旱事件的频发将会对亚热带常绿阔叶林的碳水过程带来强烈影响。由于缺乏关于植物碳水过程对持续干旱的响应与恢复机制的系统认识，现今的生态系统模型对这一影响的模拟和预测存在较大的不确定性。本研究拟以浙江宁波天童亚热带常绿阔叶林的不同干旱敏感性的五个树种为研究对象，采用同质园受控实验的方法模拟持续干旱和复水过程，并连续监测与植物碳、水过程相关的生理指标的变化轨迹，定量它们对干旱的抵抗力和恢复力，从而探讨干旱强度、气栓形成、植物死亡等对碳、水过程抵抗力和恢复力的影响，并阐明植物在干旱影响下的抵抗力和恢复力与物种性状的联系。本研究将为生态系统模型模拟和预测干旱背景下碳水过程的时空动态提供坚实可靠的理论基础，为亚热带常绿阔叶林生态系统的管理和保护提供详实有效的科学依据。

The carbon and water processes of subtropical evergreen broadleaf forests will be strongly influenced by the frequent extreme drought events in the future. The ecosystem models is not able to simulate or predict such effect due to a lack of the understanding of mechanisms underlying the response and recovery of plant carbon and water processes to persistent drought. In order to bridge this knowledge gap, we will conduct a controlled experiment with persistent drought and rewetting on five dominant species in a subtropical evergreen broadleaf forest at Ningbo, Zhejiang Provence. This research will investigate the changing trajectories of physiological indices related to carbon and water processes in plants, quantify the resistance and resilience of these processes, and to elucidate the relationships between species traits and the resistance and resilience in order to explore the influence of drought intensity, embolism forming and plant death on the resistance and resilience of carbon and water processes. This project will set a solid theoretical basis for ecosystem models to simulate and predict the spatiotemporal dynamics in carbon and water fluxes under the background of drought, and provide effective scientific support for the management and protection of subtropical evergreen broadleaf forests.