Response of Kobresia tibetica and Kobresia humilis population spatial pattern to soil moisture
Heterogeneity of plant population response to soil moisture is the environmental basis of their pattern' s formation and evolution.According to the pattern of soil water decreasing gradually from the wetland center to the edge,we set up five sampling plots to study the spatial distribution and spatial association of Kobresia tibetica and K.humilis under different soil moistures in north Qilian Mountain by using the point pattern analysis.The results showed that with the decrease of alpine wetland moisture content,the coverage,plant height and aboveground biomass of K.tibetica population were continuously increased,while the main biological features of K.humilis increased firstly then reduced.The distribution pattern of K.tibetica was clumped-regular-clumped and that of K.humilis gradually shifted from aggregation to regularity at small scale.Along with the decrease of soil moisture,the spatial association between K.tibetica and K.humilis population at small scale was positively correlated,then changed into no significant correlation and negative correlation finally.In the alpine wetland,the main biological features and spatial pattern of K.tibetica and K.humilis populations showed regular changes,which reflected the adaptability of the two species in response to habitat heterogeneity under different soil moistures.
alpine wetlandKobresia tibeticaKobresia humilisspatial patternspatial association
国家科技期刊平台
NSTL
万方数据
维普
