祁连山东段高原鼢鼠栖息地植物群落物种分布与土壤因子的关系  

Relation between plant community species distribution and soil factors in plateau zokor habitat in alpine meadow,the eastern Qilian Mountains

作　　者：叶国辉 楚彬[1] 张飞宇 华铣泽 唐庄生 花立民[1] YE Guo-hui;CHU Bin;ZHANG Fei-yu;HUA Xian-ze;TANG Zhuang-sheng;HUA Li-min(College of Grassland Science,Gansu Agricultural University,Engineering and Technology Research Center for Al-pine Rodent Pest Control,National Forestry and Grassland Administration,Lanzhou 730070,China)

机构地区：[1]甘肃农业大学草业学院,国家林业和草原局高寒草地鼠害防控工程技术研究中心,甘肃兰州730070

出　　处：《草原与草坪》2024年第1期168-174,共7页Grassland and Turf

基　　金：国家自然科学基金项目(32001385);国家自然科学基金(32160338);甘肃省教育厅产业支撑项目(2021CYZC-05);甘肃农业大学公招博士科研启动基金项目(GAU-KYQD-2018-09)。

摘　　要：【目的】研究高原鼢鼠栖息地植物群落组成变化,以及植物群落物种分布与土壤理化性质关系。【方法】以祁连山东段高原鼢鼠(Eospalax baileyi)栖息的高寒草甸为对象,设置4个不同高原鼢鼠鼠丘密度干扰区,调查植物群落特征和土壤理化性质,应用多元排序分析方法。【结果】高原鼢鼠干扰造成栖息地植物物种丰富度变异不显著,但是增加了特有物种和总的物种数量。高原鼢鼠干扰降低了优势种矮生嵩草(Kobresia humilis)的重要值,各干扰强度样地重要值累积对数模型拟合曲线达到显著水平(R2>0.95,P<0.01);随干扰强度增加,植物群落重要值整体下降。同时,高原鼢鼠干扰显著增加了杂类草植物在群落中占比(F=4.30,P<0.05)。冗余分析结果表明,土壤因子分别解释物种和功能类群空间分布变异的22.6%和54.8%(P<0.05),土壤温度、全氮和水分对群落物种分布的贡献率最高,分别占总解释效应21.28%、18.31%和16.25%。【结论】极重度高原鼢鼠干扰明显改变植物群落结构,鼢鼠干扰下土壤水热条件驱动高寒草甸植物物种的空间分布格局。【Objective】The study was carried out to explore the changes of plant community components under the plateau zokor(Eospalax baileyi)disturbances and the relation between species distribution of plant community and soil factors under these disturbances.【Method】The plateau zokor living in the alpine meadow was selected as the research subject.Four disturbance plots with different plateau zokor mound densities were set up to investigate plant community characteristics and physical and chemical properties of soil.The multivariate ordination analysis method was used in the study.【Result】The results indicated that the disturbances caused by the zokor did not change the richness of plants species in the zokor’s habitat(F=1.20,P>0.05),while increased the both number of total plant species and the specialized plant species.The zokor’s disturbances reduced the important value of the dominant species(Kobresia humilis),The fitting curve of cumulative logarithmic model of the important value reached a signifi-cant level at each plot with different disturbance intensity(R2>0.95,P<0.01).The value of plant community de-creased along with the disturbance intensity increasing.Moreover,the zokor’s disturbance significantly increased the proportion of miscellaneous grass plants in the plant community(F=4.30,P<0.05).The results of redundancy analysis showed that the factors in term of soil explained 22.6%and 54.8%of the variation of species and functional groups at the spatial distribution,respectively(P<0.05),while soil temperature,total nitrogen and soil moisture had the greatest contribution(accounting for 21.28%and 18.31%and 16.25%of the total explained effect,respec-tively)for the species distribution of plant community.【Conclusion】Extremely severe disturbance by plateau zokors significantly changed the plant community structure.The spatial distribution pattern of plant species in alpine meadow was driven by soil water and heat conditions under zokor disturbance.

关 键 词：高寒草甸 群落特征 高原鼢鼠 土壤因子 鼠丘密度 

分 类 号：S812[农业科学—草业科学]