Majadas de Tietar - Tree structural parameters from Terrestrial Lidar Scanning (2015, 2018)

This data set provides information about tree structural parameters of holm oak trees (<em>Quercus ilex L</em>) and their changes derived from terrestrial laser scanning (TLS). The TLS acquisition was conducted at Majadas (39°56´024.68´´N, 5°45´50.27´´W; Majadas de Tiétar, Cáceres, Extremadura) in 2015 and in 2018. We scanned the footprint area of three different eddy covariance sites belonging to the European Flux Database (ES-LMa, ES-LM1, ES-LM2). The dataset “Tree Parameters” is in CSV and xlsx formats. Each row is a tree and columns represent different tree parameters. The columns are: Tree ID, coordinates, crown projected area, crown projected perimeter, tree maximum height, diameter at breast height (DBH), and clumping index (see README for more details). The crown perimeter, area and tree maximum height are derived from canopy height model. DBH was measured using caliper in 2015. DBH for 36 trees was additionally derived from TLS. Clumping index was calculated from TLS for 10 trees. The dataset “Temporal changes” is in CSV and xlsx formats. It includes absolute and percentage changes (between the scan in 2015 and the one in 2018) in crown projected area and maximum tree height for 174 trees under different management regimes. These management regimes include Nitrogen treatment (59 trees), Nitrogen and Phosphorus treatment (43 trees), and pruned trees (42 trees). 30 trees are control trees without pruning or fertilization.本数据集涵盖冬青栎（*Quercus ilex L.*）的树木结构参数信息，以及基于地面激光扫描（Terrestrial Laser Scanning, TLS）获取的参数动态变化数据。地面激光扫描数据采集工作于2015年与2018年在西班牙埃斯特雷马杜拉自治区卡塞雷斯省马哈达斯德铁塔尔的观测站点开展，站点地理坐标为39°56′24.68″N，5°45′50.27″W。本次扫描覆盖了隶属于欧洲通量数据库（European Flux Database）的3个涡度协方差观测站点的足迹区域，站点编号分别为ES-LMa、ES-LM1及ES-LM2。"树木参数"数据集以CSV与XLSX格式存储，数据集内每一行对应一棵单体树木，各列依次对应不同的树木结构参数，包括：树木ID、坐标、冠层投影面积、冠层投影周长、树木最大高度、胸径（Diameter at Breast Height, DBH）以及聚集指数，详细参数说明请参见README文件。其中冠层周长、冠层面积及树木最大高度均通过冠层高度模型推导得到；2015年通过游标卡尺实测了部分树木的胸径，另有36棵树木的胸径值由TLS数据推导生成；10棵树木的聚集指数则通过TLS数据计算得出。"时间变化"数据集同样采用CSV与XLSX格式存储，该数据集包含了174棵处于不同经营管理模式下的树木，在2015年与2018年两次扫描之间的冠层投影面积与最大树高的绝对变化量及百分比变化量。本次涉及的经营管理模式分为三类：氮肥处理组（共59棵树）、氮磷配施处理组（共43棵树）以及修剪组（共42棵树），另有30棵树木作为对照组，未进行修剪与施肥处理。