The fixed forest sample plot is located in the drainage ditch basin of Dayekou, Qilian Mountain, where the hydrological observation test site of Gansu Water Conservation Forest Research Institute is located.
From July to August 2003 and from July to August 2007, the sample plots were measured by technicians of Gansu Water Conservation Forest Research Institute and Institute of cold and arid areas environment and engineering, Chinese Academy of Sciences. A total of 17 fixed forest samples were observed, including sample plot factor investigation and per tree measurement investigation. The observation factors of the sample plot mainly include the forest farm, the longitude and latitude coordinates of the central point of the sample plot, slope direction, slope position, slope, soil thickness, tree canopy density, leaf area index, etc. The instruments used for measurement mainly include tape measure, DBH ruler, flower pole, tree measuring instrument, compass and fish eye camera. The measurement factors of each tree include DBH, tree height, height under branches, crown width in cross slope direction, crown width along slope direction, growth status of single tree, etc.
For details, please refer to the metadata of "Heihe River comprehensive remote sensing joint test: fixed sample geodetic tree survey data set of dense observation area in tailugou basin and Dayekou basin (2003)" and "Heihe River comprehensive remote sensing joint test: fixed sample geodetic tree survey data set of dense observation area in tailugou basin and Dayekou basin (2007)".
Lai in this data set is the supplementary measurement data during the joint experiment of Heihe comprehensive remote sensing in 2008. That is, supplementary measurement of Lai was made in these fixed sample plots. Lai supplementary observation time was from June 1 to 13, 2008, and 15 of the 17 fixed sample plots were investigated. Four instruments were used to observe each sample plot. In addition to commercial instruments hemiview fisheye camera, LAI-2000 and trac, these instruments also use the canopy analysis instrument made by Beijing Normal University. 20m in each block × In the 20m sample plot, trac carries out two parallel route measurements along the direction perpendicular to the incident direction of sunlight, and the measurements of these two routes can basically represent the whole quadrat; Hemiview fisheye camera and LAI-2000 measure the same points, that is, take three points on the trac line respectively, plus the quadrat center point, a total of 7 measurement points.
This data set can provide ground measured data for the study of remote sensing inversion method of forest structural parameters
A total of 17 fixed forest sample plots were observed, including sample plot factor survey and per tree survey. The observation factors of the sample plot mainly include the forest farm, the longitude and latitude coordinates of the central point of the sample plot, slope direction, slope position, slope, soil thickness, tree canopy density, leaf area index, etc. The instruments used for measurement mainly include tape measure, DBH ruler, flower pole, tree measuring instrument, compass and fish eye camera. The measurement factors of each tree include DBH, tree height, height under branches, crown width in cross slope direction, crown width along slope direction, growth status of single tree, etc
Lai supplementary observation time was from June 1 to 13, 2008, and 15 of the 17 fixed sample plots were investigated. Four instruments were used to observe each sample plot. In addition to commercial instruments hemiview fisheye camera, LAI-2000 and trac, these instruments also use the canopy analysis instrument made by Beijing Normal University
20m in each block × In the 20m sample plot, trac carries out two parallel route measurements along the direction perpendicular to the incident direction of sunlight, and the measurements of these two routes can basically represent the whole quadrat; Hemiview fisheye camera and LAI-2000 measure the same points, that is, take three points on the trac line respectively, plus the quadrat center point, a total of 7 measurement points
Good data quality
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CC BY 4.0 (Creative Commons Attribution 4.0 International License).
CSTR:11738.11.ncdc.NIEER.2021.1899
10.12072/ncdc.NIEER.db1899.2022
