摘要
以内蒙古锡林郭勒盟典型草原为研究对象,以野外实地调查的数据为基础,采用半方差函数和克里格插值法,分析了割草(M)、放牧(G)和围封(CK)样地中大针茅种群(Stipa grandis)小尺度空间分布异质性。结果表明:大针茅种群密度表现为割草样地最高,放牧样地次之,围封样地最低(P<0.05);其中围封样地大针茅种群的结构比为95.3%,具有较强的空间自相关性,而刈割和放牧样地大针茅种群的结构比分别为70.2%和62.5%,属于中等程度的空间自相关性,大针茅种群的空间异质性表现为割草样地>放牧样地>围封样地;通过拟合半变异函数图,得到围封、放牧和割草样地大针茅种群空间分布最优模型分别为高斯模型、球状模型和球状模型;围封样地大针茅空间变异主要受结构因素的影响而趋于简单化分布格局,割草和放牧样地大针茅空间变异受到结构因素和随机因素的共同作用而表现为密度较大的斑块和密度较小的斑块镶嵌分布格局。
Spatial distribution heterogeneity of Stipa grandis population at small scale in a typical steppe in Xilinhot, Inner Mongolia under two utilization ways （mowing and grazing） and exclo- sure （control） was studied by using semi-variance analysis, fractal analysis and Kriging interpolated analysis based on field investigation data. The results showed that the highest population density of S. grandis was observed in the mowing plots, followed by the grazing plots, and the control plots had the lowest population density （P〈 0.05 ）. The population structure ratio of S. grandis in the exclosure plots was 95.3%, indicating a strong spatial autocorrelation; while the population structure ratios of S. grandis in the mowing plots and grazing plots were 70.2% and 62.5% respectively, indicating a medium degree spatial autocorrelation. The spatial heterogeneity of S. grandis population was in order of mowing plots 〉 grazing plots 〉 exclosure plots. The optimal models of S. grandis population spatial distribution for exclosure, mowing and grazing plots were Gaussian model, spherical model and spherical model, according to fitting semivariogram. The spatial variation of S. grandis in the exclosure plots was affected by structural factors and trended to a simple distribution pattern, while the spatial variation of S. grandis in the mowing plots and grazing plots was affected by both structural factors and random factors, and showed a mosaic distribution pattern of high density patches and low density patches.
作者
陈万杰
薛文杰
古琛
杜宇凡
王玺
赵萌莉
CHEN Wan-jie XUE Wen-jie GU Chen DU Yu-fan WANG Xi ZHAO Meng-li(College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010018, China）.)
出处
《生态学杂志》
CAS
CSCD
北大核心
2016年第10期2569-2574,共6页
Chinese Journal of Ecology
基金
农业部公益性行业(农业)科研专项(201303060)
国家自然科学基金项目(31460110和31170446)
内蒙古农业大学教育部草业与草地资源重点实验室项目资助
关键词
典型草原
地统计学
空间异质性
typical steppe
geostatistics
spatial heterogeneity
