Cary canopy census data 1993-1999

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) 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 vegetation dynamics archive.Vegetation dynamics: To understand the impacts of anthropogenic stressors on forest trees, measurements were made of aspects of trees that had to do with the condition and survival of trees. The measurements included the size and species of trees in designated plots in the forest, the size and species of saplings in smaller subplots, the quantity of seeds produced by trees using seed traps and the predation of seeds and survival of seedlings in subplots. Canopy defoliation levels were recorded via fisheye canopy photography on the 20 vegetation monitoring plots, and on other plots used specifically for spongy moth or small mammal monitoring. The vegetation data were used for direct analysis of change in forest structure and composition, and also to parameterize a computer model of vegetation dynamics, which was used as a research and management tool. Datasets include:· Canopy census – species composition, age &amp; size structure of trees, reproductive status &amp; condition of canopy· Canopy condition &amp; leaf area index via fisheye camera photos· Seed production· Seed predation· Seedling survival and growth· Mapping of all plots, trees, seed &amp; seedling data collection plots· Deer &amp; small mammal exclosure census· Soil moistureThe data included here are canopy census data collected from 1993 to 1999.<b>File list:</b>Canopy_Census_Data_1993_1999_All_Plots_Metadata_public.pdf - contains complete project metadata, personnel, methodology, and definitions for data variables in all data files.FORSTAD_Canopy_Census_Data_1993_1999_All_Plots.csvFORSTAD_Protocol_Canopy_Census_1994.pdfFORSTAD_Protocol_Canopy_Census_1997.pdfFORSTAD_Protocol_Canopy_Census_1999.pdfSee Related Materials for more data from the FORSTAD vegetation sub-project.

森林胁迫与损伤响应（Forest Response to Stress and Damage，常简称为FORSTAD）及长期森林监测项目于1992年启动，旨在探究混交栎林对多种环境变化的响应规律。本研究在纽约哈德逊河谷的卡里生态系统研究所（Cary Institute of Ecosystem Studies）实施。FORSTAD包含四项子课题：(1) 养分循环动态；(2) 舞毒蛾（spongy moth）种群动态；(3) 小型哺乳动物种群动态；(4) 植被动态。

本数据集为卡里生态系统研究所的成果产出之一，隶属于「森林生态系统长期监测：卡里植被动态档案」项目。

### 植被动态子课题
为明确人为胁迫因子对林木的影响，研究人员针对林木健康状况与存活相关的多项指标开展了实地测定。测定指标涵盖：固定样地内成树的尺寸与物种信息、小型副样地内幼树的尺寸与物种信息、利用种子收集器采集的林木种子产量、副样地内的种子捕食情况以及幼苗存活状况。研究人员通过鱼眼冠层摄影（fisheye canopy photography）记录了20个植被监测样地及专门用于舞毒蛾或小型哺乳动物监测的其他样地的冠层失叶率。

植被数据既可直接用于森林结构与组成变化的定量分析，也可用于植被动态计算机模型的参数校准，该模型可作为研究与管理工具投入使用。本数据集包含以下内容：
· 冠层普查：林木物种组成、年龄与尺寸结构、冠层繁殖状态与健康状况
· 基于鱼眼相机摄影的冠层状况与叶面积指数
· 种子产量
· 种子捕食情况
· 幼苗存活与生长状况
· 所有样地、林木、种子与幼苗数据采集样地的测绘信息
· 鹿与小型哺乳动物围栏排除样地普查
· 土壤湿度

本次公开的数据为1993年至1999年采集的冠层普查数据。

**文件清单：**
- `Canopy_Census_Data_1993_1999_All_Plots_Metadata_public.pdf`：包含完整的项目元数据、参与人员信息、研究方法以及所有数据文件中变量的定义说明。
- `FORSTAD_Canopy_Census_Data_1993_1999_All_Plots.csv`：1993至1999年所有样地的冠层普查原始数据文件。
- `FORSTAD_Protocol_Canopy_Census_1994.pdf`：1994版冠层普查实施方案文档。
- `FORSTAD_Protocol_Canopy_Census_1997.pdf`：1997版冠层普查实施方案文档。
- `FORSTAD_Protocol_Canopy_Census_1999.pdf`：1999版冠层普查实施方案文档。

如需获取FORSTAD植被动态子课题的更多数据集，请查阅相关参考资料。