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

9616124查德威克该提案已提交给环境地球化学和生物地球化学征集NSF96-2。下文所述项目由地球科学和环境生物学司联合支助。这项拟议的研究将探讨沉积到夏威夷生态系统的元素的来源、后果和命运。该项目将重点放在具有良好特征的长基质年龄梯度(LSAG)场地。目标包括：(1)确定LSAG上一个地点元素的大气输入，测量雨量、干沉积和云水截留--将分析主要元素、锶和锶同位素的沉积的所有成分；以及(2)测定LSAG上植物和土壤中的锶同位素，以及在收集这些地点排水的蒸渗仪和溪流中的锶同位素。这些结果，特别是锶同位素特征，将被用来阐明锶的来源(S)，并沿着生态系统序列追踪其命运。

9616124 Chadwick 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.