SAFARI 2000 TREE RING DATA, MONGU, ZAMBIA, DRY SEASON 2000

This data set contains tree ring data from three sites located about 25 km of the meteorological station at Mongu, Zambia. Data from about 50 individual trees are reported. In addition, chronologies (or site mean curves) that better represent common influences (e.g., in this study, the climatic signal) were developed for each site based on the individual data (Trouet, 2004; Trouet et al., 2001). The series covers a maximum of 46 years, although most series do not extend longer than 30 years. The data were collected during the SAFARI 2000 Dry Season Field Campaign of August 2000.Ten to 23 samples were taken at each site. Brachystegia bakeriana was sampled at site 1, and Brachystegia spiciformis at sites 2 and 3. The vegetation at all sites underwent primitive harvesting for subsistence earlier the same year, thus samples could be taken from freshly cut trees and no living trees were cut. At all sites, samples consisted of full stem discs. Where possible, samples were taken at breast height (1.3 m) or slightly lower. Growth ring widths were measured to the nearest 0.01 mm using LINTAB equipment and TSAP software (Rinn and Jakel, 1997). Four radii per sample disc were measured. Cross-dating and response function analyses were performed by routine dendrochronological techniques. There are two files for each site, one containing integer values representing tree ring widths (raw data), and the other containing standardized values (chronologies), for each year. The data are stored as ASCII table files in comma-separated-value (.csv) format, with column headers.

本数据集包含赞比亚蒙古气象站周边约25公里处3个采样点的树木年轮数据，共记录约50株单株树木的观测信息。此外，本研究基于单株树木数据，为每个采样点构建了能够更好反映共同影响因子（本研究中即气候信号）的年表（或称样点平均曲线）（Trouet, 2004; Trouet等, 2001）。该数据集的年轮序列最长可达46年，但多数序列时长不超过30年。
本数据采集自2000年8月开展的SAFARI 2000旱季野外调查项目，每个采样点采集10至23份样本。其中1号采样点的采样物种为Brachystegia bakeriana，2号与3号采样点的采样物种为Brachystegia spiciformis。同年早些时候，所有采样点的植被均曾为生计开展过原始采伐，因此本次采样可取自新近砍伐的林木，未砍伐存活树木。
所有采样点均采集完整的树干圆盘样本，采样位置尽可能选取在胸高（1.3米）或略低的部位。使用LINTAB设备与TSAP软件，将年轮宽度的测量精度精确至0.01毫米（Rinn和Jakel, 1997），每个树干圆盘样本需测量4条半径方向的年轮宽度。交叉定年与响应函数分析均采用常规树木年代学技术完成。
每个采样点对应两个数据文件：其一为包含各年份年轮宽度整数数值的原始数据文件，其二为包含各年份标准化数值的年表文件。所有数据以带列标题的逗号分隔值（.csv）格式的ASCII表格文件存储。