Changes in incident light intensity to streams with progressive hemlock mortality at 5 Coweeta Hydrologic Laboratory study sites from 2005 to 2015

The purpose of this study was to document changes in light intensity to streams in areas affected by hemlock mortaity. From June 2005 to November 2015, relative light intensity at 5 locations along each stream reach was monitored every 5 minutes. This study was conducted at Coweeta Hydrologic Laboratory. Five stream sites were located on 1st - 2nd order streams reaches affected by hemlock death. All sites were located in areas that have not been logged since the area became National Forest in the late 1920s and where streams passed through or were adjacent to permanent vegetation plots in which trees were measured in 1934-35, 1969-73 and 1988-93 (Elliott and Swank, 2008.)

本研究旨在记录受铁杉死亡（hemlock mortality）影响区域内溪流的光照强度变化。2005年6月至2015年11月期间，研究人员对每条溪流河段沿线的5个监测点位每5分钟开展一次相对光照强度监测。本研究实施于科韦塔水文实验室（Coweeta Hydrologic Laboratory）。5个溪流样点设于受铁杉死亡影响的1-2级溪流河段。所有样点均位于该区域于1920年代末划为国家森林公园后未进行过采伐的地块，且溪流穿过或毗邻1934-1935年、1969-1973年及1988-1993年开展过林木测量的永久植被样地（Elliott与Swank，2008）。