不同利用程度对典型草原植被空间异质性的影响  

Effects of grazing levels on the spatial heterogeneity of vegetation in typical steppe

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作  者:叶生星[1,2] 丁国栋[1] 刁兆岩[2] 郑志荣[2] 吕世海[2] YE Shengxing;DING Guodong;DIAO Zhaoyan;ZHENG Zhirong;LV Shihai(College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区:[1]北京林业大学水土保持学院,北京100083 [2]中国环境科学研究院,北京100012

出  处:《干旱区资源与环境》2019年第3期158-164,共7页Journal of Arid Land Resources and Environment

基  金:公益性行业(环保)科研专项(201509040);中央级公益性科研院所基本科研业务专项(2016YSKY-013)项目资助.

摘  要:在生态学研究中,植被空间异质性一直是众多研究者关心的主要问题之一。但是不同植被指数空间异质性的多尺度效应尚未引起人们的重视。因此,文中采用Mann-Kendall秩次相关法在内蒙古鄂温克旗对典型草原不同利用程度的植被空间异质性进行了分析。研究结果表明:Mann-kendal秩次相关法用于植被异质性分析可解释异质性的多尺度特征。禁牧可导致典型草原NDVI的异质性增加,在50m的样线内出现显著性变化的拐点5次,从禁牧到重牧过程异质性呈降低趋势。轻度放牧可促进植物种丰富空间异质性增加,在样线内出现显著性变化的拐点2次,高于其他放牧强度。过度放牧使植被的丰富度和均匀度异质性程度极大降低,使植被特质趋向均质化。不同放牧强度对植物多样性空间异质性影响较小,在样线内都未出现显著性的拐点。In ecological research,spatial heterogeneity of vegetation has been one of the main issues that many researchers are concerned. But the multi-scale effect of different vegetation index spatial heterogeneity has not caused enough attention. Therefore,this paper uses Mann-Kendall method to analyze the vegetation spatial heterogeneity with different levels of use of typical steppe in Inner Mongolia Ewenki Autonomous Banner. The results show that using Mann-Kendall method to analyze the vegetation spatial heterogeneity can explain the multi-scale characteristic of heterogeneity. Grazing can increased the heterogeneity of NDVI in typical steppe. Inflection point with significant changes in 50 m line transect appeared 5 times,and the heterogeneity decreased from light grazing to heavy grazing. Light grazing promoted the spatial heterogeneity of plant species richness and the inflection point with significant changes in line transect appeared 2 times,higher than other grazing intensity.Overgrazing reduced the richness and evenness of vegetation greatly and made the plant specialty homogenize.However,different grazing intensity had little effect on the spatial heterogeneity of vegetation,and no inflection point with significant change appeared.

关 键 词:植被空间异质性 Mann-Kendall秩次相关法 放牧强度 典型草原 

分 类 号:S812[农业科学—草业科学;农业科学—畜牧学;农业科学—畜牧兽医]

 

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