Soil Microbial Community Co-occurrence Network Structure and Its Drivers in Arid Mountainous Areas

In August 2021, eight typical vegetation zones—Desert Steppe (DS), Prunus mongolica (PM), Ulmus glaucescens (UG), Pinus tabuliformis (PT), aspen×juniper mixed forest (AJMF), spruce×juniper mixed forest (SJMF), Picea crassifolia (PC), and Alpine Meadow (AM) —were selected at altitudes between 1800-3000 m on the western slopes of the Helan Mountains in Ningxia. Six standard plots were established for desert grassland and alpine meadow zones, while 12 standard plots were set up for each of the other vegetation zones as replicates, following the contour lines. The plot sizes were 20 m × 20 m for forest plots, 5 m × 5 m for shrub plots, and 1 m × 1 m for grass plots.

2021年8月，在宁夏贺兰山西坡海拔1800~3000米的区域内，选取了8类典型植被带，分别为荒漠草原（Desert Steppe，DS）、蒙古扁桃（Prunus mongolica，PM）、灰榆（Ulmus glaucescens，UG）、油松（Pinus tabuliformis，PT）、山杨×杜松混交林（aspen×juniper mixed forest，AJMF）、云杉×杜松混交林（spruce×juniper mixed forest，SJMF）、青海云杉（Picea crassifolia，PC）以及高山草甸（Alpine Meadow，AM）。其中荒漠草原与高山草甸植被带各设置6个标准样地，其余6类植被带各设置12个标准样地作为重复样地，所有样地均沿等高线布设。林地样地规格为20 m × 20 m，灌丛样地为5 m × 5 m，草本样地为1 m × 1 m。