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Effect of nitrogen and phosphorus addition on leaf nutrient concentrations and nutrient resorption efficiency of two dominant alpine grass species

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Journal of Arid Land 2021年第10期13卷 1041-1053页

作者： LIU Yalan LI Lei LI Xiangyi YUE Zewei LIU Bo State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Cele National Station of Observation and Research for Desert Grassland Ecosystems Cele 848300China University of Chinese Academy of Sciences Beijing 100049China Shandong Provincial Key Laboratory of Soil Conservation and Environmental Protection College of Resources and EnvironmentLinyi UniversityLinyi 276000China

Nitrogen(N)and phosphorus(P)are two essential nutrients that determine plant growth and many nutrient cycling *** N and P deposition is an important driver of ecosystem ***,in contrast to numerous studies about the impacts of nutrient addition on forests and temperate grasslands,how plant foliar stoichiometry and nutrient resorption respond to N and P addition in alpine grasslands is poorly ***,we conducted an N and P addition experiment(involving control,N addition,P addition,and N+P addition)in an alpine grassland on Kunlun Mountains(Xinjiang Uygur Autonomous Region,China)in 2016 and 2017 to investigate the changes in leaf nutrient concentrations(i.e.,leaf N,Leaf P,and leaf N:P ratio)and nutrient resorption efficiency of seriphidium rhodanthum and Stipa capillata,which are dominant species in this *** showed that N addition has significant effects on soil inorganic N(NO_(3)^(-)-N and NH_(4)^(+)-N)and leaf N of both species in the study *** with green leaves,leaf nutrient concentrations and nutrient resorption efficiency in senesced leaves of *** was more sensitive to N addition,whereas N addition influenced leaf N and leaf N:P ratio in green and senesced leaves of ***.N addition did not influence N resorption efficiency of the two species.P addition and N+P addition significantly improved leaf P and had a negative effect on P resorption efficiency of the two species in the study *** influences on plants can be explained by increasing P *** present results illustrated that the two species are more sensitive to P addition than N addition,which implies that P is the major limiting factor in the studied alpine grassland *** addition,an interactive effect of N+P addition was only discernable with respect to soil availability,but did not affect ***,exploring how nutrient characteristics and resorption response to N and P addition in the a

关键词： leaf nutrient concentration nutrient resorption efficiency leaf N:P ratio N addition P addition seriphidium rhodanthum Stipa capillata

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