摘要
通过测定新疆44个样地45种荒漠植物的粗根碳(C)、氮(N)、磷(P)元素含量,探索荒漠植物化学计量特征与环境因子的关系。结果表明:荒漠植物粗根C、N和P含量为440±73、9.86±3.84和0.82±0.48 mg·g-1,C∶N、C∶P和N∶P为51±21、707±388和15±10。不同生活型植物的粗根C含量存在显著差异,其中乔木最高、灌木次之、草本最低,而粗根P含量表现为相反的趋势;此外,灌木的粗根N含量显著高于乔木和草本。C与P、N与P呈异速生长关系,其幂指数分别为-0.460、0.699。C、N、P化学计量特征与经纬度、年平均温度、年平均降水量存在非线性关系。荒漠植物粗根C、N、P计量特征主要受气候因子的影响,生活型差异和土壤养分影响次之,反映了荒漠植物生长主要受水分限制。
We explored the relationship between C,N and P stoichiometry of coarse roots in 45 species of desert plants and environmental factors from 44 sites in Xinjiang.The results showed that coarse-root C,N and P concentrations of these species were 440±73,9.86±3.84,and 0.82±0.48 mg·g-1,respectively,and C∶N,C∶P and N∶P averaged 51±21,707±388,and 15±10,respectively.Significant differences in nutrient concentration existed among three plant lifeforms.Specifically,coarse-root C concentrations decreased in the order of trees,shrubs and herbs,while root P showed an opposite trend.The coarse-root N concentration was the highest in shrubs.Only C vs P and N vs P in roots showed allometric growth relationships,with power exponents being-0.460 and 0.699,respectively.There were nonlinear relationships of coarse-root C,N and P with longitude,latitude,mean annual temperature(MAT),and mean annual precipitation(MAP).In comparison with life-form and soil nutrient content,climatic factors(MAP,MAT)had greater effects on the stoichiometric characteristics of C,N and P in the coarse roots of desert plants,which reflects water limitation for plant growth in deserts.
作者
何茂松
罗艳
彭庆文
严正兵
杨思琪
李凯辉
韩文轩
HE Mao-song;LUO Yan;PENG Qing-wen;YAN Zheng-bing;YANG Si-qi;LI Kai-hui;HAN Wen-xuan(Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;University of Chinese Academy of Sciences,Beijing 100049,China;Research Center for Ecology and Environment of Central Asia,Chinese Academy of Sciencesi Urumqi 830011,China;Bayanbuluk Grassland Ecosystem Research Station,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Bayinbuluk 841314,Xinjiang,China;College of Urban and Environmental Sciences,Peking University,Beijing 100871,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2019年第9期2603-2614,共12页
Chinese Journal of Ecology
基金
“新疆维吾尔自治区高层次人才引进工程”项目
中国科学院新疆生态与地理研究所“西部之光-西部引进人才”资助
关键词
化学计量
粗根
气候因子
土壤养分
植物生活型
stoichiometry
coarse root
climatic factor
soil nutrient
plant life-form
