祁连山典型灌丛植物根系化学计量特征及其与土壤理化因子的关系

Root Stoichiometric Characteristics of Typical Shrubs and Their Correlation with Soil Physicochemical Factors in Qilian Mountain

为了揭示植物根系养分含量及其化学计量特征与土壤因子之间的关系,选择祁连山大野口流域的甘青锦鸡儿(Caragana tangutica)、鲜黄小檗(Berberis diaphana)、金露梅(Potentilla fruticosa)、鬼箭锦鸡儿(Caragana jubata)和吉拉柳(Salix gilashanica)等5种典型灌丛为研究对象,研究了植物粗根、细根化学计量特征及其与土壤理化因子之间的关系。结果表明,粗根碳、氮、磷平均含量分别为569.55、7.86、1.02 g/kg,细根分别为541.38、8.61、1.10 g/kg,其中磷变异系数较高,碳变异系数最小;粗根C/N、C/P、N/P均值分别为86.63、729.78、9.77,细根分别为71.34、527.61、8.11;碳、磷含量高于中国植物根系平均水平,粗根氮含量高于中国植物粗根的平均水平,但细根氮含量低于中国植物细根的平均水平。土壤有效磷含量和质量含水量是影响粗根生态化学计量特征的主要因子,土壤有效磷含量和pH是影响细根生态化学计量特征的主要因子。

In order to reveal the relationship between root nutrient content,stoichiometric characteristics and soil factors,Caragana tangutica,Berberis diaphana,Potentilla fruticose,Caragana jubata and Salix gilashanica which lived in dayekou basint of Qilian Mountain were selected as object,the stoichiometric characteristics of coarse and fine roots and their relationship with soil physical and chemical factors were studied.The results showed that the average contents of C,N and P in coarse roots and fine roots were 569.55,7.86,1.02 g/kg and 541.38,8.61,1.10 g/kg,respectively.C/N,C/P and N/P of coarse roots and fine roots were 86.63,729.78,9.77 and 71.34,527.61,8.11,respectively.The contents of C and P were higher than the average levels of Chinese plant roots,while the N content of coarse roots was higher than the average level of Chinese plant coarse roots,but the N content of fine roots was lower than the average level of Chinese plant fine roots.Soil available phosphorus content and soil mass water content were the main soil factors affecting the stoichiometric characteristics of coarse roots,while soil available phosphorus content and soil pH value were the main soil factors affecting the ecostoichiometric characteristics of fine roots.