shrub-herbage-biocrusts structural features

The field investigation adopts a stratified random sampling design: 3-7 5 m × 5 m sample plots are randomly arranged at intervals of ≥ 20 m in each plot, for a total of 40 sample plots. Synchronize the collection of the following data within each sample plot: Structure parameters of shrub-grass-biocrust vegetation community: Horizontal structure indicators: shrub projection coverage, foundation coverage, plant density, herbaceous projection coverage and root coverage, biocrusts coverage, richness of vegetation species, and vertical structure indicators: shrub height and crown width and herbaceous height.