Leaf Functional Traits of Different Forest Communities and Their Environmental Response Mechanisms
Taking the main forest community types occurring in the Luoshan Nature Reserve(Picea crassi-folia pure forest,Populus davidiana pure forest,Picea crassifolia×Pinus tabuliformis mixed forest,Populus davidiana×Pinus tabuliformis mixed forest)as the research objects,the changes and variation characteristics of six plant functional traits including leaf area(LA),leaf dry matter content(LDMC),spe-cific leaf weight(SLW),leaf carbon content(LCC),leaf nitrogen content(LNC)and leaf phosphorus con-tent(LPC)in topographic factors and soil factors were determined,and the correlations between leaf func-tional traits were analyzed.The relationship between the functional traits and the environment was explored,and the growth strategies and resource utilization capabilities of plants in mountainous forest communities in the desert steppe transition zone were revealed based on the functional trait-environment relationship.The results showed that there existed significant correlations between leaf functional traits.There were differences in leaf functional traits among four different forest types.Because different forest types were in different geographical locations,the topographic factors and soil physical and chemical properties were also different.In order to adapt to different habitats,plants adopted different leaf strategies to adapt to habitats.The Simpson index,Shannon-Wiener index and Margalef index of shrub layer in P.crassifolia pure forest were the lowest significantly(P<0.05),and there was no significant difference in species diversity index of herb layer.The Simpson index of P.crassifolia pure forest was the lowest significantly,and the Shan-non-Wiener index of P.crassifolia pure forest was significantly lower than that of P.davidiana pure for-est.A total of 55 species of understory plants,belonging to 24 families and 43 genera,were found in all plots of the four forest communities.The dominant species of shrub layer were Syringa oblata and Cotone-aster multiflorum.The dominant species in the herb layer were Polygonatum odoratum and Carex.The common function of soil factors and altitude factors affected functional traits and species diversity indexes.Organic matter and available phosphorus were positively correlated with LA,LNC and LPC,and negatively correlated with LDMC,SLW and LCC.Altitude was positively correlated with LDMC and negatively corre-lated with LA,LNC and LPC.The organic matter,total nitrogen and total phosphorus were positively correlated with Simpson index,Shannon-Wiener index and Pielou evenness index.Altitude was negatively correlated with Simpson index,Shannon-Wiener index,Pielou evenness index and Margalef index.
leaf functional traitforest community typespecies diversityenvironmental factorsoil physico-chemical propertyresponse mechanism
万方数据
维普
