放牧强度对荒漠草原无芒隐子草密度及空间分布的影响  

Effects of grazing intensity on the density and spatial distribution of Cleistogenes songorica in desert steppe

作　　者：门欣洋 吕世杰 侯东杰 王梓晗 李治国 韩国栋 孙海莲 王保林 王忠武 MEN Xin-yang;LV Shi-jie;HOU Dong-jie;WANG Zi-han;LI Zhi-guo;HAN Guo-dong;SUN Hai-lian;WANG Bao-lin;WANG Zhong-wu(College of grassland and resources and environment,Inner Mongolia Agricultural University,Hohhot,Inner Mongobia 010010,China;Academy of agricultural and animal husbandry Science,Hohhot,Inner Mongobia 010031,China;Inner Mongolia Xiaocao digital Ecological Industry Co.,Ltd,Hohhot,Inner Mongobia 010013,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010010 [2]内蒙古自治区农牧业科学院,内蒙古呼和浩特010031 [3]内蒙古小草数字生态产业有限公司,内蒙古呼和浩特010013

出　　处：《草地学报》2022年第11期3106-3112,共7页Acta Agrestia Sinica

基　　金：内蒙古自治区科技成果转化项目(2020CG0013);内蒙古重大科技专项(ZDZX2018020,2021ZD0044-03);国家自然科学基金(31760143);科技成果转化项目(2019CG069);呼市科技项目(2020-成-重-1)资助。

摘　　要：植物种群密度及空间分布的研究可以发现植物群落在放牧过程中的生态学现象及规律。为研究荒漠草原无芒隐子草(Cleistogenes songorica)种群在不同放牧强度下的密度差异及空间分布变化,采用随机区组试验设计:对照区(Contral,CK)、轻度(Light grazing,LG)、中度(Moderate grazing,MG)和重度放牧区(Heavy grazing,HG),通过机械取样法收集数据,结合地统计等方法进行分析。结果表明:无芒隐子草密度表现为LG>HG>CK>MG,随放牧强度增大,无芒隐子草的密度先增加,后减少,在重度放牧条件下,密度又增加。无芒隐子草在群落中的绝对密度占比伴随放牧强度增大逐渐增大,占比为HG>MG>CK>LG。无芒隐子草在4个处理区下分型维度D_(0)数值相近,CK,LG,MG的空间结构比C/(C_(0)+C)均>0.75,HG的空间结构比C/(C_(0)+C)为0.100。放牧条件下,无芒隐子草种群空间分布较为均匀,空间异质性减弱,空间分布主要受结构性因素影响。The study of plant population density and spatial distribution can reflect the ecological phenomena and laws of plant communities in the process of grazing.To study the density differences and spatial distribution changes of Cleistogenes songorica populations in desert steppe under different grazing intensities,a randomized block trial design was adopted:contral area(CK),light grazing area(LG),moderate grazing area(MG),and heavy grazing area(HG).Data were collected by mechanical sampling methods and analyzed in combination with geostatistical methods.The results showed that the density of C.songorica in desert grassland was LG>HG>CK>MG,with the increase of grazing intensity,the density of C.songorica increased first and then decreased,but under the condition of heavy grazing,the density increased again.The absolute density proportion of C.songorica in the community gradually increased with the increase in grazing intensity,the proportion of absolute density of C.songorica in the community is HG>MG>CK>LG.Under the four treatment areas,the values of D_(0) of typing dimension were relatively similar,and the structural ratios C/(C_(0)+C)of CK,LG,and MG were larger than 0.75,the spatial structure ratio C/(C_(0)+C)of HG is 0.100.Under grazing conditions,the spatial distribution of C.songorica species was relatively uniform,the spatial heterogeneity was weakened,and the spatial distribution was mainly affected by structural factors.

关 键 词：无芒隐子草 地统计分析 荒漠草原 密度 空间分布 

分 类 号：S812[农业科学—草业科学]