祁连山综合观测网：黑河流域地表过程综合观测网（大满超级站叶面积指数-2021）

该数据集包含了2021年7月22日至2021年9月5日的黑河水文气象观测网中游大满超级站叶面积指数观测数据。站点（100.376° E, 38.853° N）位于甘肃省张掖市大满灌区内，海拔1556m，下垫面是玉米。观测样方共计3个，每个样方大小约30m×30m，经纬度分别为（100.374°E, 38.855°N）、（100.371° E, 38.854°N）、（100.369°E, 38.854°N）。每个样方内布设4个冠层下节点和1个冠层上节点。
本数据集由叶面积指数无线传感网（LAINet）获取，该仪器原始观测数据为仪器自动获取的每个节点逐日逐小时的光照数据（Level0），利用LAINet软件对原始观测数据进行处理，逐节点计算每天LAI（Level1），进一步对无效值识别与填充，并5天滑动平均消除天气变化对LAI计算的影响（Level2），对有多个LAINet节点的观测子区，节点的均值为该子区的最终观测值（Level3）。
本次发布的数据集为处理后的Level3产品，数据以*.xls格式存储。
黑河流域地表过程综合观测网或站点信息请参考Liu et al. (2018)，观测数据处理请参考Qu et al. (2014)。

This dataset contains leaf area index (LAI) observation data from the Daman Super Station in the middle reaches of the Heihe River Hydrological and Meteorological Observation Network, covering the period from July 22 to September 5, 2021. The station (100.376° E, 38.853° N) is located in the Daman Irrigation District, Zhangye City, Gansu Province, with an altitude of 1556 m and maize as its underlying surface. There are a total of 3 observation quadrats, each with an area of approximately 30 m × 30 m, and their coordinates are (100.374° E, 38.855° N), (100.371° E, 38.854° N), and (100.369° E, 38.854° N), respectively. Four below-canopy nodes and one above-canopy node are deployed in each quadrat.

This dataset was acquired by the Leaf Area Index Wireless Sensor Network (LAINet). The original observation data of this instrument are hourly and daily light data automatically collected by the device for each node (Level 0). The LAINet software is used to process the original observation data: daily LAI is calculated for each node to generate Level 1 data; invalid values are further identified and filled, and a 5-day moving average is applied to eliminate the impact of weather variations on LAI calculation to produce Level 2 data; for observation sub-regions with multiple LAINet nodes, the mean value of all nodes is taken as the final observation value of the sub-region (Level 3).

The dataset released this time is the processed Level 3 product, and the data is stored in *.xls format.

For information on the Heihe River Basin Comprehensive Observation Network for Surface Processes or the station, please refer to Liu et al. (2018); for the observation data processing procedure, please refer to Qu et al. (2014).