PRF/M: A Geographical Information System Analysis of Stream Detrital Processing

树木残体向下游移动的速度将在以下方面进行比较： 科维塔实验森林（Coweeta Experimental Forest）， 美国农业部林业局（U.S. Department of Agriculture's Forest Service）。 这些将 然后与来自一对流的类似结果进行比较， 里哥港的卢基略实验森林 的位置 在这些支流的源头添加标记的木材 在主要降雨事件后绘制河流地图， 确定这些碎片的数量和大小如何影响它们的 下游移动。 更大的数量和多样性的大小， 木材预计在溪流蜿蜒穿过古老的森林， 更多的时候会形成碎石坝， 流速和增加落叶保持在 流，从而改变物理化学条件的 源源不断的 这种差异对人类社会产生了深远的影响。 底栖生物群落成员的种类组成和丰度。 这项研究的一个主要组成部分是应用 地理信息系统（GIS）技术记录 天然和添加木本植物的位置顺序变化 碎片 正在开发的一些地理信息系统软件将用于 天然集水区物质向下游运动模拟 盆地的地形，海拔和坡度的数字数据。 这种方法已被开发来处理数字化数据 可从遥感（飞机和卫星）图像获得。 存储和处理大型比较数据集的能力是 在生态学研究中得到广泛应用，但尚未 应用于碎屑物质的分析。 艾伦·P·柯维奇博士 俄克拉荷马州大学的教授，将在12个月的中期， 环境生物学终身职业奖学金 research. 主办机构是格鲁吉亚大学。

Rates of woody debris movement downstream will be compared among four streams in Coweeta Experimental Forest (a site operated by the U.S. Department of Agriculture's Forest Service). These will then be compared with analogous results from a pair of streams in Puerto Rigo's Luquillo Experimental Forest. The locations of marked (tagged) wood added to headwaters of these tributary streams are to be mapped after major rainfall events in order to determine how quantity and sizes of these pieces influence their downstream movement. The greater amont and diversity of sizes of wood expected in streams meandering through older forests will more often lead to formation of debris dams, which decrease water flow rates and increase retention of leaf litter within the stream, thereby altering physico-chemical conditions of the stream. Such differences have a profound influence on the species composition and abundances of benthic community members. A major component of this study is the application of Geographical Information System (GIS) technology to record sequential changes in positions of natural and added woody debris. Some of the GIS software being developed will be used to simulate movement of materials downstream in natural catchment basins by using digital data on topography, elevation, and slope. This methodology has been developed to manipulate digitized data available from remotely sensed (aircraft and satellite) imagery. The capacity to store and handle large comparative data sets is finding wide use in ecological studies but has not yet been applied to analysis of detrital materials. Dr. Alan P. Covich, of the University of Oklahoma, will devote twelve months of Mid- Career Fellowship in Environmental Biology tenure to this research. The host institution is the University of Georgia.