锡林郭勒草原植物叶片C、N、P生态化学计量特征及其对环境因子的响应OA

This study was conducted in the natural steppe of Xilin Gol.A transect was established along the west-east hydrothermal gradient,compassing 30 sample plots that encompassed desert steppe,typical steppe,and meadow steppe.The contents and ecological stoichiometry of leaf carbon(C),nitrogen(N),and phosphorus(P)in Xilin Gol steppe were analyzed,and the influence of various environmental factors were investigated by traditional statistical methods and the Geodetector technique based on field surveys,sampling,and laboratory analyses.The results showed that:(1)A total of 120 species of seed plants,belonging to 78 genera and 31 families,were recorded along the transect in Xilin Gol steppe.The vegetation was dominated by perennial herbs,with Asteraceae being the family containing the most genera and species.(2)In Xilin Gol steppe,leaf C content was the highest in legume among the plant functional groups,while Liliaceae had the highest N and P contents.The Cyperaceae showed the highest C∶N and C∶P ratios,while legumes had the highest N∶P ratio.Significant variations were observed in leaf C,N,and P contents and their ecological stoichiometric ratios across the different functional groups.(3)Leaf C,N,and P contents and their ecological stoichiometric ratios in Xilin Gol steppe were all influenced to varying degrees by meteorological,geographical,and soil factors.These patterns are determined by the synergistic effects of these factors.