Dissertation Research: Physio-Chemical and Biological Control over the Fate of N and P in Tropical Soils

99-02317 Vitousek/OlanderDDIG：热带土壤中氮和磷命运的物理-化学和生物控制我们目前对土壤中氮和磷结合的调节机制的了解还不完全。因此，到目前为止，还没有区域或全球范围的建模工作包括磷动态或非生物氮固定。这项研究的目的是更好地了解系统的生物和非生物成分如何控制N和P的吸收，以及生物和理化过程如何相互作用来调节这些营养库的周转和可获得性。将采用实验室和田间试验相结合的方法，确定这些养分在夏威夷群岛的土壤溶液、微生物生物量和土壤矿物-土壤有机质池中的分配情况。了解调控这些过程的机制将使科学家能够改进模型，从而提高对肥力、森林转化、氮沉积增加、气候变化和其他环境变化的长期生态系统反应预测的准确性。

99-02317Vitousek/OlanderDDIG: Physio-chemical and biological control over the fate of nitrogen and phosphorus in tropical soilsOur current understanding of the mechanisms regulating the binding of N and P in soils is incomplete. As a result, no regional or global scale modeling efforts to date have included phosphorus dynamics or abiotic nitrogen immobilization. The objective of this research is to develop a better understanding of how biotic and abiotic components of a system control the uptake of N and P, and of how biological and physio-chemical processes interact to regulate the turnover and availability of these nutrient pools. A combination of laboratory and field experiments will be used to determine the partitioning of these nutrients among soil solution, microbial biomass, and the soil mineral - soil organic matter pool in the Hawaiian archipelago. Understanding the mechanisms regulating these processes will enable scientists to improve models and thereby increase the accuracy of predictions of long-term ecosystem responses to fertilization, forest conversion, elevated N deposition, climate shifts, and other environmental changes.