不同载畜率对短花针茅荒漠草原建群种空间异质性的影响

为探讨短花针茅(Stipa breviflora)荒漠草原建群种空间异质性在不同载畜率下的变化特点和差异,本研究以内蒙古自治区乌兰察布盟四子王旗内蒙古农牧业科学院试验基地的短花针茅种群为研究对象,采用半方差函数、分形维数和克里格差值方法进行系统研究,结果如下:短花针茅种群空间异质性随载畜率的增大呈增大趋势。轻度放牧(LG)和重度放牧(HG)处理区短花针茅种群空间分布主要受结构性因素影响,但表现结果的影响过程存在差异;中度放牧(MG)处理区短花针茅种群空间分布除结构性因素占主导地位外,放牧家畜的随机性牧食行为也占较大比重。

Effects of Different Stocking Rates on Spatial Heterogeneity of Constructive Species in Stipa breviflora Desert Steppe

This study was carried out to estimate effects of different stocking rates on spatial heterogeneity of constructive species in a Stipa breviflora desert steppe.The study assessed Stipa breviflora population using semi-variance functions,fractal dimension and Kriging interpolation method in Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences experimental base,Siziwang county,Wulanchabu League of Inner Mongolia.The results were as follows:the spatial heterogeneity of Stipa breviflora population increased with the increase of stocking rate.The spatial distribution of Stipa breviflora population was mainly affected by structural factors in light grazing (LG) and heavy grazing (HG) treatment,but there were differences in the influence process of showing results in LG and HG treatment.The random grazing behavior of livestock also accounted for a larger proportion although spatial distribution of Stipa breviflora population was dominated by structural factors in moderate grazing (MG).