西鄂尔多斯高原-阴山北麓荒漠植物群落及生境数据库（2017-2021）

本数据集以乌兰布和沙漠、库布齐沙漠、贺兰山东部、西鄂尔多斯—阴山北麓荒漠草原等为核心调查区，于2017-2021年，重点调查分布在这些区域内的草原化灌木荒漠、半灌木-矮半灌木荒漠、灌木荒漠等植被类型。其中主要灌木群系包括红砂群系、珍珠猪毛菜群系、柠条锦鸡儿群系等，主要草本群系包括短花针茅群系、碱韭群系、沙生针茅群系等。利用样方调查法，在调查点位布设1个100 m×100 m等地，样地内系统设置5个10 m×10 m灌木样方、9个1 m×1 m的草本样方，并挖取一个1.5 m×1.1 m×1.2 m 的土壤剖面。祥查植物群落种类组成、高度、冠幅、盖度、密度、频度及生物量等生态学指标数据。灌木地上生物量获取采用标准枝或标准株法；草本地上生物量获取采用全株收获法；草本地下生物量采用根钻法进行测定，每个土壤剖面内，按照不同方向选择3个采样点（3个重复）。地下生物量采集深度为0-60cm，分三层取样（0-20cm、20-40cm、40-60cm）。如果在调查样地内有乔木存在，则调查样方内乔木的种类、株数（密度）、胸径、高度和冠幅，同时记录死亡的乔木和灌木的种类及数量并测定地上生物量。土壤剖面调查过程中，分层进行取样，分层梯度划分为0-10 cm、10-20 cm、20-30 cm、30-50 cm、50-70 cm、70-100 cm。划分土壤类型后，量取不同剖面母质层深度和钙积层厚度，测定不同土层机械组成、有机质、全氮、全磷、 pH 值等指标。

This dataset takes the Ulan Buh Desert, Kubuqi Desert, eastern Helan Mountains, and desert steppe in western Ordos–northern piedmont of Yinshan Mountains as the core survey areas.
From 2017 to 2021, we focused on investigating vegetation types distributed within these regions, including steppe shrub desert, semi-shrub-dwarf semi-shrub desert, and shrub desert.
The dominant shrub formations include *Reaumuria soongorica* formation, *Salsola passerina* formation, and *Caragana korshinskii* formation, while the dominant herbaceous formations include *Stipa breviflora* formation, *Allium polyrhizum* formation, and *Stipa glareosa* formation.
Using the quadrat survey method, one 100 m × 100 m sample plot was established at each survey site.
Within the sample plot, 5 shrub quadrats (10 m × 10 m) and 9 herbaceous quadrats (1 m × 1 m) were systematically arranged, and one soil profile with dimensions of 1.5 m × 1.1 m × 1.2 m was excavated.
Comprehensive surveys were conducted on ecological indicator data including species composition, height, crown width, coverage, density, frequency, and biomass of plant communities.
The above-ground biomass of shrubs was measured using the standard branch or standard plant method; the above-ground biomass of herbaceous plants was obtained via the whole-plant harvesting method; the underground biomass of herbaceous plants was determined using the root corer method.
For each soil profile, 3 sampling points (3 replicates) were selected along different directions.
The collection depth of underground biomass was 0–60 cm, with sampling divided into three layers: 0–20 cm, 20–40 cm, and 40–60 cm.
If trees were present in the survey plot, the species, individual number (density), diameter at breast height (DBH), height, and crown width of trees within the quadrat were surveyed.
Meanwhile, the species and quantity of dead trees and shrubs were recorded, and their above-ground biomass was measured.
During the soil profile survey, samples were collected layer by layer, with the layering gradient set as 0–10 cm, 10–20 cm, 20–30 cm, 30–50 cm, 50–70 cm, and 70–100 cm.
After identifying the soil type, the depth of the parent material layer and the thickness of the calcareous horizon for each profile were measured, and indicators such as mechanical composition, organic matter content, total nitrogen, total phosphorus, and pH value of different soil layers were determined.