南亚热带主要森林类型磷循环的生物调节机制及其影响因素分析

在一些热带和亚热带地区，土壤缺磷问题严重。在全球变化和区域环境质量改变的现实状况下，这种问题或将更为突出。然而目前国内外学者仅仅对部分农业和林业栽培植物的低P适应机制展开了研究，且这些研究大都在均质土壤中进行，而较少开展自然林植物对高度异质森林土壤环境的低P适应研究。基于目前拥有的长期野外控制实验研究平台，本项目拟研究南亚热带主要森林类型（季风常绿阔叶林、针阔叶混交林、马尾松林）磷循环的生物调节机制及其影响因素。通过本项目的研究，将阐明全球变化和区域环境质量改变状况下南亚热带不同森林类型主要优势植物吸收P的策略及其机制；评估微生物对植物吸收土壤P的贡献；了解异质土壤环境的自然林内P的循环机制及其影响因素。为森林生态系统的可持续经营提供科学依据，为森林生态系统的管理以及策略的制定提供理论依据。

Soil phosphorus (P) deficiency has been a serious problem in some tropical and subtropical areas, which would become more serious under the global change and regional environmental change. Previously, the studies about plant adaptation to soil low P stress mostly focused on agricultural crops and plantation tree species. And most of the experiments have been carried out in homogeneous soils. However, few studies have been concerned on the adaptation of native species to the low P stress in the heterogeneous soil. Hence, this project aims to study the biological adjust and adaptation mechanisms to low P concentrations in natural forest types of southern subtropical areas via some long-term forest plots. The strategy and mechanism of P absorption by the main dominant tree species under global change and regional environmental change will be analyzed and clarified. The contribution of the microbe to P absorption by the trees will be evaluated. Besides, the P cycling mechanism of natural forests and the key factors which affect soil P availability in the heterogeneous soil will also be discovered. It will provide scientific proof for the sustainable management of the forest ecosystems and the theoretical basis for the policy making for forest management department.