Cross-Site: Stream Flow Hydrology Comparisons and Synthesis at Long-Term Ecological Research Sites - Links with Climate Terrestrial Ecosystems and Stream Ecology

该项目旨在进一步了解气候、植被和各种生态系统条件下的径流之间的关系，并促进LTER和非LTER站点之间的站点间活动。这项建议的总体目标是通过阐明径流对一系列气候、植被和干扰因素的响应来描述广泛地点的径流水文学，时间尺度从十年到迪尔不等。我们希望展示蒸汽流如何在每个尺度上响应植被和气候，以及气候、植被和径流的内在耦合如何控制径流对干扰的响应，从而控制河流生态的各个方面。该项目的初步研究阶段包括对安德鲁斯、考韦塔和哈伯德布鲁克LTER站点以及卡斯帕克里克实验流域站点(美国农业部林业局/加利福尼亚州)的长期蒸汽流记录进行比较分析。这些林地涵盖了广泛的气候条件(如降雨量和季节性、降雪影响程度)和植被条件(如落叶与针叶树、叶面积指数)。随后，它们将使更多的长期热核实验堆和其他场地参加一个讲习班和相关活动，这些活动旨在为更广泛的场地条件制定场地特征和跨场地分析。这项工作将包括使用水文模型来审查关于在感兴趣的时间尺度上控制水平衡的假设。LTER气候和河流生态委员会的代表将参加研讨会的规划和实施。总体努力的成果将包括：(1)具有站点间共同变量/时间分辨率的在线数据库；(2)类似于LTER网络第15号出版物中的溪流研究的LTER出版物；以及(3)对较少站点和较大站点进行比较分析的期刊文章。

This project is designed to further understanding of relations among climate, vegetation, and streamflow across a range of ecosystem conditions and to advance intersite activities among LTER and nonLTER sites. The overall objective of this proposal is to describe streamflow hydrology in a wide range of sites by elucidating streamflow response to a range of climatic, vegetation, and disturbance factors operating at time scales ranging from decadal to diel. We expect to demonstrate how steamflow responds to vegetation and climate at each of these scales, and how this inherent coupling of climate, vegetation and streamflow controls streamflow response to disturbance and hence aspects of stream ecology. The initial research phase of the project involves comparative analysis of long-term steamflow records from Andrews, Coweeta, and Hubbard Brook LTER sites and the Caspar Creek Experimental Watersheds site (USDA Forest Service/State of California). These forest sites encompass a broad range of climatic (e.g., precipitation amount and seasonality, degree of snow influence) and vegetation (e.g., deciduous vs. conifer, leaf area index) conditions. Subsequently, they will involve a much larger group of LTER and other sites in a workshop and associated activities designed to develop site characterization and cross-site analysis for broader range of site conditions. This work will include use of hydrologic models to examine hypothese concerning controls on water balances at the time scales of interest. Representatives of the Climate and Stream Ecology Committees of LTER will take part in workshop planning and conduct. Products of the overall effort will include: (1) on -line data bases with common variables/time resolution between sites, (2) an LTER publication similar to the Stream Research in the LTER Network Publication No. 15, and (3) journal articles from the comparative analyses conducted for the small set of sites and for the larger set of sites.