草业学报2019，Vol.28Issue(2)：23-32,10.DOI:10.11686/cyxb2018459
宁夏草原植物叶片氮磷化学计量特征及其驱动因素
Factors influencing leaf nitrogen and phosphorus stoichiometry in plant species of Ningxia grasslands
摘要
Abstract
Nitrogen (N) and phosphorus (P) cycles control plant growth and development, community structure and function of grassland ecosystems.In order to define patterns of change in leaf N and P stoichiometry in Ningxia grasslands, and their main driving factors, leaf N and P contents were determined for 409 dominant plant species at 111 sampling sites.The geographic distribution of leaf stoichiometry patterns was analyzed in relation to the climatic factors, mean annual temperature (MAT) and mean annual precipitation (MAP), as well as altitude and latitude of the sampling site.The arithmetic means for leaf N and P content of Ningxia grassland plants were 22.47 and 1.83mg·g-1, respectively, and the mean N∶P ratio was 14.24.The growth of Ningxia grassland plants was limited by N and P.Leaf N and N∶P ratio increased with the increasing latitude and MAT, and with decreasing altitude and MAP.Leaf P increased with increase in MAP, while leaf N and P both increased with increased longitude.Spatial distribution and hydrothermal conditions explained70.83％ of the variance for leaf N, leaf P and N∶P ratio, indicating that the hydrothermal environment is the main driving factor for the Leaf N and P stoichiometry of Ningxia grassland plants.The results provide a theoretical basis for the management and improvement of productivity in Ningxia grassland.关键词
宁夏天然草地植物/叶片N、P含量/N/P/化学计量特征Key words
Ningxia natural grassland plants/leaf N, P concentration/N/P ratio/stoichiometry characteristics引用本文复制引用
李明雨,黄文广,杨君珑,李小伟..宁夏草原植物叶片氮磷化学计量特征及其驱动因素[J].草业学报,2019,28(2):23-32,10.基金项目
国家自然科学基金项目(31560154) （31560154）
农业部草地资源检测项目(2016) （2016）
宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)资助 （草学学科）
