LBA-ECO ND-11 FOREST DAMAGE FOLLOWING REDUCED IMPACT LOGGING, NW MATO GROSSO, BRAZIL

Data were collected in the logging concession at the Fazenda Rohsamar in the municipality of Juruena in northwestern Mato Grosso. Estimates of damage associated with logging operations were made after logging operations were complete in 2003 and 2004. Damage associated with gaps created by felling single trees was estimated in 54 individual gaps. Characteristics of the single harvested tree were recorded and included species, DBH, commercial height, total height, and canopy proportions. Damage to all surrounding trees was recorded. Stratified transects in two logging blocks were used to estimate damage associated with road building and skid trails. Twenty-six transects were established in Block 5 and 21 transects in Block 18 to assess the frequency of damage by log skidders and tree felling. The boundaries between different types of damage were noted along the transect and the length in meters of that damage type along the transect was recorded. From this information, the area of the logging block affected by road building and skid trails was determined.

The Gap Survey and the Logging Damage Transects Survey data are provided in comma-separated ASCII files. A third file provides the coordinates of the starting points for the Survey Transects.

本数据集采集于马托格罗索州西北部茹鲁埃纳市（Juruena）的Fazenda Rohsamar伐木特许权区域。2003年与2004年伐木作业完成后，研究人员对伐木活动相关的破坏情况开展了评估。针对单株树木伐倒形成的林隙所引发的破坏，共对54个独立林隙进行了破坏程度估算。研究人员记录了被采伐单株树木的各项特征，包括树种、胸径（Diameter at Breast Height, DBH）、商品材高度、总高度及冠部占比，并同步记录了周边所有树木所遭受的破坏情况。研究人员在两个伐木区块内布设分层样带，用以评估道路修建与集材道相关的破坏影响：其中第5区块布设26条样带，第18区块布设21条样带，以此评估集材拖拉机作业与树木伐落作业造成破坏的发生频率。沿样带记录不同类型破坏的边界，并统计各类破坏沿样带延伸的长度（单位：米）。基于上述数据，可计算得到受道路修建及集材道影响的伐木区块总面积。本数据集包含林隙调查与伐木破坏样带调查的逗号分隔ASCII文件，另有第三份文件提供了样带调查起始点的坐标信息。