Relation between plant community species distribution and soil factors in plateau zokor habitat in alpine meadow,the eastern Qilian M ountains
[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.
alpine meadowcommunity characteristicsplateau zokorsoil factorzokor's mound density
万方数据
维普
