The 2/3 scaling of twig nitrogen to phosphorus in woody plants  

作　　者：Zhiqiang Wang Karl JNiklas Zeqing Ma Dechun Jiang Jianming Deng 

机构地区：[1]Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Southwest Minzu University,Chengdu,610041,China [2]Institute of Qinghai-Tibetan Plateau,Southwest Minzu University,Chengdu,610041,China [3]Plant Biology Section,School of Integrative Plant Science,Cornell University,Ithaca,NY,14853,USA [4]Center for Forest Ecosystem Studies and Qianyanzhou Ecological Station,Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,China [5]Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu,610041,China [6]State Key Laboratory of Grassland Agro-Ecosystem,College of Ecology,Lanzhou University,Lanzhou,730000,China

出　　处：《Forest Ecosystems》2022年第4期521-528,共8页森林生态系统（英文版）

基　　金：financially supported by the National Science Fund for Excellent Young Scholars (No. 31822010);the National Key Research and Development Program of China (No. 2020YFA0608102);the Biodiversity Survey and Assessment Project of the Ministry of Ecology and Environment,China (No. 2019HJ2096001006);National Scientific and Technological Program on Basic Resources Investigation (No.2019FY102002);the Innovation Base Project of Gansu Province (No.20190323);the Sichuan Science and Technology Program (No.2020YFH0005)

摘　　要：Background:Nitrogen(N)and phosphorus(P)are important elements for plant metabolism and growth.Therefore,the quantification of the scaling relationship of N to P in plant organs can help us understand many fundamental ecological processes.The general scaling relationships between N and P in leaves and in fine roots have been reported.As compared to leaves and fine roots,however,little information is available on the N versus P scaling relationship in the stems of woody plants,especially for twigs.In this study,a comprehensive dataset comprising 2,038 N=P paired observations for a total of 536 woody species was compiled and analyzed to determine whether a general scaling relationship exists.Results:The global mean values of twig N and P concentrations and N:P ratios were 9.33 mg⋅g^(-1),1.12 mg⋅g^(-1) and 10.16,respectively.Twig N and P concentrations and N:P ratios differed significantly within and across functional groups and biomes.Across all of the species,a uniform 0.67 scaling exponent of twig N to P was observed across different functional groups and biomes,i.e.,a 2/3-power scaling relationship was observed.However,this numerical value differed across different sites,albeit converging onto 0.67 with increasing sample sizes.Soil total phosphorus was the largest contributor to the variation in the numerical value of the scaling exponent.Conclusion:These results provide useful parameters for stoichiometric growth models,and advance our understanding of the mechanisms underlying plant nutrient dynamics.This study has potential implications in predicting responses of nutrient cycling in terrestrial ecosystem responses to changes in the environment.

关 键 词：NITROGEN PHOSPHORUS Scaling exponents TWIGS Woody plants 

分 类 号：Q948[生物学—植物学]