过渡带灌木层植物群落生态位及种间联结分析OA

This study investigated the species characteristics and interspecific relationships of the vegetation in the typical area of Kalamaili National Park,aiming to deepen the understanding of the dynamics and relationships of the vegetation in the area and provide a theoretical basis for revealing the vegetation dynamics of this park.A typical survey sample plot of 200 m×300 m(60 000 m2)was set in the ecotone.During the survey,it was divided into 100 quadrats of 20 m×30 m(600 m2).A"Z"-shaped survey was conducted from the south to the north and from the west to the east.The name,location,plant height,north-south and east-west crown widths,and elevation of each shrub individual in the quadrats were recorded.The results showed that a total of 8 shrub species were recorded in the ecotone,with Haloxylon ammodendron being the absolute dominant species,having an importance value of 49.85%and a niche width of 0.468 8,which were significantly higher than those of other species.The plant height of most species was positively correlated with the crown width,which was extremely significant in Halostachys caspica and H.ammodendron(r＝0.61,P<0.01;r＝0.52,P<0.01).Elevation had a significant differentiating effect on species distribution.Niche overlap analysis showed that non-overlapping species pairs accounted for 35.71%of the total pairs,indicating weak interspecific competition.The overall connectivity test showed a non-significant negative correlation(χ2 ＝1.158 4,P>0.05),indicating a loose community structure and low stability,which had not yet reached a climax succession state.This is related to the relatively harsh habitat conditions and certain zonal distribution.