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当前位置: 首页 > 文章 > 利用方式对大针茅草原优势种糙隐子草空间异质性的影响 生态学杂志 2019 (4) 953-960
Position: Home > Articles > Effects of utilization regimes on spatial heterogeneity of the dominant species Cleistogenes squarrosa in Stipa grandis steppe Chinese Journal of Ecology 2019 (4) 953-960

利用方式对大针茅草原优势种糙隐子草空间异质性的影响

作  者：
张峰;杨阳;乔荠瑢;贾丽欣;赵天启;赵萌莉
单  位：
内蒙古农业大学草原与资源环境学院
关键词：
大针茅草原;空间异质性;半方差函数;地统计学
摘  要：
为探讨不同草地利用方式下糙隐子草种群空间分布的变化特点,以内蒙古自治区锡林郭勒盟毛登牧场大针茅草原优势物种糙隐子草(Cleistogenes squarrosa)为研究对象,通过野外试验,以地统计学为基础,采用半方差函数、分形维数及克里格插值法,分析了围封、放牧和刈割样地糙隐子草种群小尺度空间分布异质性。结果表明:糙隐子草种群密度分别为放牧(28.63株·m~(-2))>围封(13.60株·m~(-2))>刈割(3.85株·m~(-2))(P<0.05),放牧显著增加糙隐子草种群密度(P<0.05),而刈割显著降低糙隐子草种群密度(P<0.05);通过半方差函数进行模型拟合,围封、放牧和刈割样地糙隐子草种群分布分别符合指数模型、球状模型和球状模型;空间分布格局分析表明,各样地糙隐子草种群的结构比分别为刈割(91.9%)>放牧(75.3%)>围封(71.1%),放牧与刈割样地的空间自相关性均较高,主要受结构性因素影响,而围封样地空间自相关处于中等程度,受随机性因素影响较大;结合分形维数、2D平面图及3D立体图分析,3块样地空间结构良好,空间分布简单,说明合理放牧及刈割不会对种群分布格局造成很大影响,但与围封样地相比,放牧增加了糙隐子草种群空间异质性,而刈割降低了种群异质性。
译  名：
Effects of utilization regimes on spatial heterogeneity of the dominant species Cleistogenes squarrosa in Stipa grandis steppe
作  者：
ZHANG Feng;YANG Yang;QIAO Ji-Rong;JIA Li-Xin;ZHAO Tian-Qi;ZHAO Meng-Li;College of Grassland,Resource and Environment,Inner Mongolia Agricultural University;
单  位：
ZHANG Feng%YANG Yang%QIAO Ji-Rong%JIA Li-Xin%ZHAO Tian-Qi%ZHAO Meng-Li%College of Grassland,Resource and Environment,Inner Mongolia Agricultural University
关键词：
Stipa grandis steppe;;spatial heterogeneity;;semi-variance function;;geostatistics
摘  要：
A field experiment was carried out to evaluate the changes of spatial distribution of Cleistogenes squarrosa population on Stipa grandis steppe under different utilization regimes(exclosure,mowing,and grazing) in Maodeng ranch,Xilingol,Inner Mongolia.With geostatistics,the semi-variance function,fractal dimension and Kriging interpolation method,we analyzed the effects of small-scale spatial heterogeneity of C.squarrosa population in exclosure,grazing,and mowing treatments.The results showed that population density of C.squarrosa followed the order:grazing(28.63 plants·m~(-2))>exclosure(13.60 plants·m~(-2))>mowing(3.85 plants·m~(-2))(P<0.05).Grazing increased while mowing reduced population density of C.squarrosa(both P<0.05).Population densities of C.squarrosa under the treatments of exclosure,grazing and mowing were consistent with exponential model,spherical model and spherical model,respectively.According to the results of spatial distribution pattern analysis,the structural ratio of C.squarrosa population under mowing,grazing and exclosure was 91.9%,75.3%,and 71.1%,respectively.The spatial autocorrelations of grazing and mowing treatments were higher mainly due to structural factors,while that of the exclosure treatment was moderate and affected by random factors.Combined with the fractal dimension and 2 D and 3 D views,the spatial structure of the three plots was good with simple spatial distribution,indicating that reasonable grazing and mowing did not impact the distribution of C.squarrosa population.Compared to the exclosure treatment,grazing increased and mowing reduced the spatial heterogeneity of C.squarrosa population.

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