College of Grassland, Resources and Environment/Key Laboratory of Grassland Resources of the Ministry of Education/Inner Mongolia Key Laboratory of Grassland Management and Utilization/Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture, Inner Mongolia Agricultural University, Hohhot 010011, China.
College of Grassland, Resources and Environment/Key Laboratory of Grassland Resources of the Ministry of Education/Inner Mongolia Key Laboratory of Grassland Management and Utilization/Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of the Ministry of Agriculture, Inner Mongolia Agricultural University, Hohhot 010011, China; Agricultural College, Inner Mongolia University for Nationalities, Tongliao 028000, China.
Sci Total Environ. 2020 Aug 15;730:138900. doi: 10.1016/j.scitotenv.2020.138900. Epub 2020 Apr 30.
Stipa breviflora Grisb. (S. breviflora) is a dominant species in the desert steppe of northern China. Its function and role at the plant community level increases with increasing stocking rate. However, the response of spatial stability remains unclear. We selected treatment areas representing no grazing (CK), light grazing (LG), moderate grazing (MG) and heavy grazing (HG) in a long-term grazing experiment (2004-2017) in a S. breviflora desert steppe in Inner Mongolia, northern China. Using a mechanical sampling method, 40 m × 40 m representative sample plots were selected to obtain the height, coverage and density of the S. breviflora population and community, and we computed the standing crop of mechanical sampling quadrats based on a random sample of cutting quadrats. Analysis of standing crop, density of S. breviflora population and its ratio in the plant community showed that the dominant role of S. breviflora population in the plant community increased with increasing grazing intensity, while the spatial stability of S. breviflora population not only had many dimensions, but also many states. The dimension or combination of dimensions of its stability performance and its adaptive state varied under different disturbance intensities and frequencies.
短花针茅（S. breviflora）是中国北方荒漠草原的优势种，其在植物群落水平上的功能和作用随着载畜率的增加而增加。然而，其空间稳定性的响应仍不清楚。我们在内蒙古的一个长期放牧实验（2004-2017 年）中选择了无放牧（CK）、轻度放牧（LG）、中度放牧（MG）和重度放牧（HG）处理区。采用机械采样法，选择 40 m×40 m 的代表性样方，获取短花针茅种群和群落的高度、盖度和密度，并根据随机样方的切割样方计算机械采样样方的生物量。基于对切割样方的随机抽样，分析生物量、短花针茅种群密度及其在植物群落中的比例表明，短花针茅种群在植物群落中的优势作用随着放牧强度的增加而增加，而短花针茅种群的空间稳定性不仅具有多个维度，而且具有多个状态。其稳定性表现和适应状态的维度或维度组合在不同的干扰强度和频率下会发生变化。
