环境变化对南亚热带森林土壤磷有效性的影响及其生物化学调控机制

土壤磷的有效性是决定热带亚热带森林生态系统生产力及其他生物过程的主要因素之一，其高低很大程度上取决于磷在土壤中的转化迁移过程，如磷酸酶水解或铁氧化还原等，而这些过程又受多种环境因素共同影响。本项目以南亚热带森林为研究对象，借助模拟全球气候变化主要情景的多个野外控制实验平台，探讨环境变化对土壤磷有效性的影响及其生物化学调控机制并分析不同树种之间的适应性，有助于从养分有效性和种间竞争共同驱动的角度揭示南亚热带森林群落结构趋势性变化的关键机制，为未来气候变化背景下森林生态系统生物多样性稳定及其可持续经营提供科学依据。

The availability of phosphorus in soils is one of the major factors in determining tropical and subtropical forest ecosystem productivity and other biological processes, and it largely depends on the transformation of phosphorus in soil, such as phosphatase hydrolysis or iron redox, but these processes are also influenced by many environmental factors. The objective of the project is to investigate the effects and mechanistic controls of environmental changes on soil phosphorus availability in subtropical forests in southern China. In this project, multiple on-going manipulation-experiments that simulate main global climate change scenarios will be applied. This project will improve our understanding of the key mechanism driven by nutrient availability and interspecific competition for community changes in subtropical forests in southern China, and may provide some scientific basis for biodiversity and sustainable management of forest ecosystem under future climate change.