Multiple Resource Interactions and Ecosystem Function

9509613 Rastetter多资源相互作用和生态系统功能陆地生态系统执行许多重要功能，包括碳，氧，氮，磷和水的循环和封存，以及生物量和土壤有机质的生产。 这些功能受到以下因素的严格限制：（1）植物和土壤微生物的营养需求，（2）植物和微生物适应环境变化的能力，（3）生态系统中各种营养物质的数量，以及（4）这些营养物质向生态系统提供或从生态系统中损失的速率。 本研究将通过建立一个理论模型，综合这些限制对生态系统功能的影响，该模型包括生态系统元素循环之间的相互作用，植被和土壤微生物对这些元素可利用性变化的适应，以及对元素竞争导致的物种组成的变化。 研究结果将提高对生态系统地球化学和群落过程的理解，将导致生态系统和群落生态学之间更紧密的联系，将有助于预测和解释生态系统和植物群落对环境变化的反应，并将有助于解释为什么不同的生态系统对环境变化的反应不同。 ??

9509613 Rastetter Multiple Resource Interactions and Ecosystem Function Terrestrial ecosystems perform many important functions including the cycling and sequestration of carbon, oxygen, nitrogen, phosphorus, and water, and the production of biomass and soil organic matter. These functions are tightly constrained by (1) the nutritional requirements of plants and soil microorganisms, (2) the ability of plants and microorganisms to adapt to changes in their environment, (3) the amounts of various nutrients in the ecosystem, and (4) the rate at which these nutrients are supplied to or lost from the ecosystem. This study will synthesize the effects of these various constraints on ecosystem function through the development mf a theoretical model that includes the interactions between ecosystem element cycles, the acclimation of vegetation and soil microorganisms to changes in the availability of these elements, and the changes in species composition resulting from competition for the elements. The results will improve the understanding of both ecosystem biogeochemistry and community processes, should result in closer linkage between ecosystem and community ecology, will help to predict and interpret the responses of ecosystems and plant communities to changes in the environment, and will help explain why different ecosystems respond differently to changes in the environment. ??