U.S.-Brazil Cooperative Research: Resource Partitioning Among Woody Plants of a Species-Rich Cerrado

小行星9415987 这个美国-巴西合作科学计划支持与 G博士的来访戈尔茨坦，夏威夷大学，F。Meinzer，夏威夷糖种植园主 协会和P. Rundel和P.杰克逊，加州洛杉矶大学，到巴西。 他们将与A博士合作。巴西利亚大学的佛朗哥和他的学生们， 确定土壤水分和养分的时空分配程度 巴西中部塞拉多的代表性木本植物物种之间的资源。 他们 还建议检查相关的地面过程，如长期用水 氮利用效率和其他生理生态参数作为衡量 资源利用和竞争。 稳定氢同位素技术将用于解决土壤水问题 资源划分 稳定的氮同位素将用于区分 物种间的氮获取（即固氮菌从非固氮菌中获取氮）。 整合 地下和地上过程，稳定碳同位素将用于评估 长期内在的水利用效率。 气体交换测量将用于 确定实现水利用效率变化的机制。 代表性木本植物物种具有不同的模式叶生产和其他 将为研究选择特征。 ***

9415987 Goldstein This U.S.-Brazil Cooperative Science Program supports travel expenses related to the visits of Drs. G. Goldstein, Univ. of Hawaii, F. Meinzer, Hawaiian Sugar Planters Association, and P. Rundel and P. Jackson, Univ. of California Los Angeles, to Brazil. They will be working with Dr. A. Franco, of the Univ. of Brasilia and his students, on determining the extent of temporal and spatial partitioning of soil water and nutrient resources among representative woody plant species of a cerrado of central Brazil. They also propose to examine related above ground processes, such as long term water use efficiency, nitrogen use efficiency, and other ecophysiological parameters as measures of resource use and competition. Stable hydrogen isotope techniques will be used to address the question of soil water resource partitioning. Stable nitrogen isotopes will be used to distinguish modes of nitrogen acquisition among species (i.e. nitrogen fixers from non fixers). To integrate below ground and above ground processes, stable carbon isotopes will be used to assess long-term intrinsic water-use efficiency. Gas exchange measurements will be used to determine the mechanisms by which variation in water use efficiency is achieved. Representative woody plant species with different patterns of leaf production and other characteristics will be selected for the study. ***