Collaborative Research: Sources, Consequences, and Fates of Atmospherically-Derived Elements During Soil and Ecosystem Development

9616125 Huebert该提案已提交给环境地球化学生物地球化学征集 NSF 96-2。 下文所述项目得到地球科学和环境生物学司的联合支助。 拟议的研究将解决沉积到夏威夷生态系统的元素的来源，后果和命运。 该项目将侧重于特征明确的长基底年龄梯度（LSAG）场地。 目标包括：（1）确定LSAG上一个地点的大气元素输入，测量湿降、干沉降和云水拦截--将分析沉降的所有组成部分的主要元素、锶和锶同位素;（2）确定LSAG上植物和土壤、收集这些地点排水的蒸渗计和溪流中的锶同位素。 研究结果，特别是锶同位素特征，将被用来阐明锶的来源和追踪其命运沿着生态系统序列。

9616125 Huebert This proposal was submitted to the Environmental Geochemistry & Biogeochemistry solicitation NSF 96-2. The project described below is being jointly supported by the Division of Earth Sciences and Environmental Biology. The proposed research will address the sources, consequences, and fates of elements deposited to Hawaiian ecosystems. The project will focus on well-characterized long substrate age gradient (LSAG) sites. Objectives include: (1) determining the atmospheric input of elements at one site on the LSAG, measuring wetfall, dry deposition, and cloudwater interception - all components of the deposition will be analyzed for major elements, strontium and strontium isotopes; and (2) determining Sr isotopes in plants and soils on the LSAG, in lysimeters collecting water draining these sites and in streams. The results, especially the strontium isotope signatures, will be used to elucidate the source(s) of Sr and trace its fate along the ecosystem sequence.