AmeriFlux US-GBT GLEES Brooklyn Tower
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This is the AmeriFlux version of the carbon flux data for the site US-GBT GLEES Brooklyn Tower. Site Description - *** US-GBT has been incorporated into the US-GLE dataset, making this site obsolete. All future downloads and publications should refer to US-GLE *** The Glacier Lakes Ecosystem Experiments Site (GLEES) site is located on land owned by the U.S. government and managed by US Forest Service as part of the Medicine Bow National Forest. Many of the trees in the immediate vicinity of the site are older than 400 years, inter-dispersed among trees much younger in age. This widespread age distribution is most likely a derivation of one of two scenarios: 1) A widespread stand replacement about 400 years ago followed by a slow replacement; 2) Intermittent random disturbances over the past 400 years (Bradford et al. 2008). A decade long spruce beetle outbreak that peaked in 2008 resulted in the mortality of 85% of the forested basal area. There are a few private land holdings in the area, with scattered uncorked mining claims. Following the establishment of the National Forest, mining was banned and grazing was closed in the early 1990's in the upper portion of the GLEES site. Recreation in the winter, when snow can remain in patches into the summer months, snow mobiling and cross country skiing are popular. During the limited summer, hiking, camping and fishing are common activities. The site is accessible by vehicle only during the summer on Forest Road FDR 317, and in the winter, the tower is only reachable via snowmobile.
本数据集为站点US-GBT GLEES Brooklyn Tower的碳通量数据AmeriFlux版本。站点说明：*** US-GBT已并入US-GLE数据集，本站点数据现已废弃。所有后续下载与发表工作均应参考US-GLE数据集 *** 冰川湖泊生态系统试验站（Glacier Lakes Ecosystem Experiments Site，简称GLEES）坐落于美国政府所有土地之上，由美国林务局（US Forest Service）作为Medicine Bow国家森林的一部分进行管理。站点周边多数树木树龄超过400年，与大量幼龄树木交错分布。这种广泛存在的年龄结构大概率源于两种情景之一：1）约400年前发生过一次大面积林分更替，后续更替过程较为缓慢；2）过去400年间间歇性发生随机干扰（Bradford等，2008）。2008年达到爆发峰值的长达十年的云杉甲虫灾害，造成该区域85%的森林胸高断面积林木枯死。该区域内分布有少量私人地块，散落着未登记的采矿权主张。国家森林设立后，采矿活动被明令禁止；1990年代早期，GLEES站点上游区域的放牧活动也被关停。冬季时，积雪可呈斑块状残存至夏季多个月份，雪地摩托运动与越野滑雪是热门休闲活动。在较为短暂的夏季，徒步、露营与垂钓是常见的户外活动。该站点仅可在夏季通过FDR 317号林道驾车抵达；冬季则仅可通过雪地摩托抵达观测塔。
