叶尔羌河流域胡杨叶片生态化学计量特征及对土壤因子的响应OA

Based on the population of Populus euphratica in Yarkant River Basin as the research object,the ecological stoichiometric characteristics of C,N,P and K in leaves of Populus euphratica and their response to soil factors were analyzed.The results showed that(1)the contents of total carbon(TC)and total phosphorus(TP)in the leaves of Populus euphratica in the study area were basically the same as those in the desert area of Xinjiang,and the total nitrogen(TN)was lower than that in the desert area of Xinjiang.Meanwhile,mass ratio of N to P less than 14 indicating that the growth of Populus euphratica was mainly limited by N.Ecological stoichiometric ratios of Populus euphratica were as follows:w(C)∶w(P)＞w(C)∶w(N)＞w(C)w(K)＞w(N)∶w(P)＞w(N)∶w(K)＞w(P)∶w(K).(2)The variation coefficients of total carbon(TC),total nitrogen(TN),total phosphorus(TP),total potassium(TK),C∶N,C∶P,C∶K,N∶P,N∶K and P∶K were all less than 50%,and the variation intensity was below medium intensity,indicating that the ecological stoichiometry of Populus euphratica leaves was very stable.(3)The ecological stoichiometric characteristics of Populus euphratica were significantly positively correlated with soil total phosphorus(SP))(P＜0.05),soil total phosphorus(SP)was the dominant factor for the variation of ecological stoichiometric characteristics of Populus euphratica leaves.