Cary canopy photo data for years 1982, 1983, 1991

The Forest Response to Stress and Damage (frequently referred to as FORSTAD) and long term forest monitoring project began in 1992 to study how mixed-oak forests respond to multiple forms of environmental change. The research took place at Cary Institute of Ecosystem Studies in the Hudson Valley of New York. FORSTAD included several sub-projects including (1) air pollution and nutrient cycling dynamics, (2) spongy moth population dynamics, (3) small mammal dynamics and (4) vegetation dynamics. This dataset is a contribution to the Cary Institute of Ecosystem Studies, and is part of the Long term monitoring of forest ecosystems: Cary spongy moth dynamics. To understand the impacts of spongy moth, a non-native forest pest, every stage of the spongy moth life cycle was monitored. This included counts of spongy moths in each life stage as well as the effects of the caterpillar’s consumption of forest trees. The measurements included spongy moth egg mass density and fecundity, egg mass hatch and parasitism, late instar larval density, pupal density (at high density), canopy photos to estimate defoliation, visual estimate of defoliation, mechanisms of moth release, including white footed mouse and chipmunk removals in 1995, 1997 and 1998, larval & pupal persistence, pupal predation, natural pupation and pupal viral analysis.Spongy moth monitoring began at Cary Institute in 1981, prior to the onset of the FORSTAD project, when a pilot study was initiated at Cary Institute, to sample a wide range of habitats and the resident spongy moth population. Data provided in this dataset include canopy photo data collected in 1982, 1983 and 1991. Note that similar data were collected as part of the Cary Institute FORSTAD project using a similar but different method from 1994-1997.File list:Cary_Canopy_Photo_Data_1982_1983_1991.csvCary_Canopy_Photo_Data_1982_1983_1991_SHARE.pdf - contains complete project metadata, personnel, methodology, and definitions for data variables.See Related Materials for more data from the spongy moth sub-project.

森林对胁迫与损伤的响应（常简称FORSTAD）与长期森林监测项目于1992年启动，旨在探究混合橡树林对多种环境变化的响应模式。本研究在纽约州哈德逊谷的生态系统研究卡里研究所（Cary Institute of Ecosystem Studies）开展。FORSTAD包含四项子项目：(1) 空气污染与养分循环动态；(2) 舞毒蛾（spongy moth）种群动态；(3) 小型哺乳动物动态；(4) 植被动态。本数据集为生态系统研究卡里研究所的成果产出之一，隶属于"森林生态系统长期监测：卡里研究所舞毒蛾动态"项目。

为明确外来森林害虫舞毒蛾的生态影响，研究对其生命周期的所有阶段开展了监测工作，内容涵盖各虫期舞毒蛾的数量统计，以及其幼虫取食林木所引发的危害效应。监测指标包括：舞毒蛾卵块密度与繁殖力、卵块孵化率及寄生率、老龄幼虫密度、高密度种群下的蛹密度、用于估算落叶程度的冠层照片、落叶程度目视评估、舞毒蛾种群调控机制（含1995、1997、1998年对白足鼠和花栗鼠的移除操作）、幼虫与蛹的存活率、蛹捕食率、自然化蛹情况以及蛹病毒分析。

早在FORSTAD项目启动前的1981年，卡里研究所就已启动舞毒蛾监测工作，当时开展了一项试点研究，对多样生境及本地舞毒蛾种群进行采样。本数据集包含1982、1983及1991年采集的冠层照片数据。需注意，1994至1997年间，卡里研究所FORSTAD项目亦采用类似但存在差异的方法采集了同类数据。

文件清单：
Cary_Canopy_Photo_Data_1982_1983_1991.csv
Cary_Canopy_Photo_Data_1982_1983_1991_SHARE.pdf：包含完整的项目元数据、人员信息、研究方法及数据变量定义。
如需获取舞毒蛾子项目的更多数据，请参阅相关材料。