祁连山草地生态系统优势物种生长季的生态化学计量特征  

Ecological Stoichiometric Characteristics of Dominant Species in the Grassland Ecosystem of Qilian Mountains During Growing Season

作　　者：张婷 朱晓鹏 徐海燕[1] 吴晓东 刘桂民[1] 甘子鹏 毛楠 李莉莎 薛守业 康国慧 殊秋丽 陈卓 ZHANG Ting;ZHU Xiao-peng;XU Hai-yan;WU Xiao-dong;LIU Gui-min;GAN Zi-peng;MAO Nan;LI Li-sha;XUE Shou-ye;KANG Guo-hui;SHU Qiu-li;CHEN Zhuo(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu Province 730070,China;Cryosphere Research Station on the Qinghai-Tibet Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of the Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu Province 730000,China;China Agricultural University,Beijing 100193,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]中国科学院西北生态环境资源研究院冰冻圈国家重点实验室青藏高原冰冻圈观测研究站,甘肃兰州730000 [3]中国农业大学,北京100193

出　　处：《草地学报》2024年第6期1810-1818,共9页Acta Agrestia Sinica

基　　金：国家自然科学基金项目(42261025,41861011);中国科学院西部之光项目资助。

摘　　要：植物生态化学计量是许多过程模型的重要参数,为了解高海拔地区优势物种的生态化学计量特征及其与土壤养分的关系,本文测定祁连山高寒草地生态系统5种优势物种叶片和根系的生态化学计量,分析了其与根际土壤养分的关系。结果表明:随着生长季推移,优势物种叶片总有机碳(Total organic carbon, TOC)含量相对稳定,全氮(Total nitrogen, TN)含量下降,而C∶N和C∶P则增加;大部分物候期下,青藏大戟(Euphorbia altotibetica Paulsen)的TN和全磷(Total phosphorus, TP)含量高于其他优势物种,且C∶N和C∶P低于其他优势物种,而垂穗披碱草(Elymus nutans Griseb.)的TN含量低于其他优势物种,且N∶P和C∶P高于其他优势物种;祁连山地区植物生态化学计量受到土壤化学计量的影响,植物生长主要受到N元素的限制。研究结果为相关植被模型和陆面过程模型的参数化提供了重要的基础数据。Plant ecological stoichiometry is an important parameter in many process models.To understand the ecological stoichiometric characteristics of the dominant species at high altitude region and their relationship with soil nutrients,we determined the ecological stoichiometry of leaves and roots of five dominant species in alpine grassland ecosystems in the Qilian Mountains,and analyzed their relationship with soil nutrients.The results showed that:with the growing season process,the total organic carbon(TOC)content in leaves of the dominant species was relatively stable,while the total nitrogen(TN)content was decreased,while the C∶N and C∶P was increased.In most phenological periods,the contents of TN and total phosphorus(TP)of Euphorbia altotibetica Paulsen were higher than those of other dominant species,and the contents of C:N and C:P were lower than those of other dominant species,while the TN content of Elymus nutans Griseb was lower than that of other dominant species,and N:P and C:P were higher than those of other dominant species.The ecological stoichiometry of plants in the Qilian Mountains is affected by soil stoichiometry,and plant growth is mainly limited by N.Our results provide important data the parameterization of many vegetation models and land-surface process models.

关 键 词：草地生态系统 生态化学计量 优势物种 生长季 植物器官 

分 类 号：S812.2[农业科学—草业科学]