U.S.-Brazil Dissertation Research: Biogeochemical Controls on the Loss of Dissolved Organic Nutrients from Tropical Ecosystems

9602949维图塞克/内夫这个美洲项目奖将支持斯坦福大学的杰森·内夫在彼得·维图塞克博士的指导下进行的论文研究。这一题为“热带生态系统溶解有机养分损失的生物地质化学控制”的项目将在巴西东部帕拉戈米纳斯地区和塔帕霍斯森林保护区两个地点进行。该项目的目标是研究控制两种热带森林土壤类型(Tapajos)以及巴西第二个地点(Paragominas)原生林和次生林土壤中溶解有机磷(DOP)和溶解有机氮(DON)的来源和去向的机制。热带森林中氮和磷的生物地球化学循环在全球碳循环和土地利用变化后农业的可持续性方面都发挥着关键作用。这项研究将提高我们对这些损失途径的理解，为评估它们在自然和农业生态系统肥力发展和维持中的作用提供基础。***

9602949 Vitousek/Neff This Americas Program award will support dissertation research by Jason Neff of Stanford University, under the direction of Dr. Peter Vitousek. This project, entitled "Biogeochemical Controls on the Loss of Dissolved Organic Nutrients from Tropical Ecosystems" will take place at two sites, the Paragominas region of Eastern Brazil and at the Tapajos Forest Reserve. The goal of this project is to address mechanisms which control the source and fate of dissolved organic phosphorus (DOP) and dissolved organic nitrogen (DON) in two tropical forest soil types (Tapajos) and also soils from primary and secondary forest at a second site (Paragominas) in Brazil. The biogeochemical cycles of nitrogen and phosphorus in tropical forests play key roles in both the global carbon cycle and in the sustainability of agriculture following land use change. This research will improve our understanding of these loss pathways, providing a basis from which to evaluate their role in the development and maintenance of fertility in natural and agricultural ecosystems. ***