Background:Nitrogen(N)and phosphorus(P)are important elements for plant metabolism and growth.There-fore,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 nu-merical 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 under-standing of the mechanisms underlying plant nutrient dynamics.This study has potential implications in pre-dicting responses of nutrient cycling in terrestrial ecosystem responses to changes in the environment.

Zhiqiang Wang;Karl J.Niklas;Zeqing Ma;Dechun Jiang;Jianming Deng

Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Southwest Minzu University,Chengdu,610041,China;Institute of Qinghai-Tibetan Plateau,Southwest Minzu University,Chengdu,610041,China;Plant Biology Section,School of Integrative Plant Science,Cornell University,Ithaca,NY 14853,USA;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;Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu,610041,China;State Key Laboratory of Grassland Agro-Ecosystem,College of Ecology,Lanzhou University,Lanzhou,730000,China

森林生态系统（英文版）

[1]Zhiqiang Wang;Karl J.Niklas;Zeqing Ma;Dechun Jiang;Jianming Deng-.The 2/3 scaling of twig nitrogen to phosphorus in woody plants)[J].森林生态系统（英文版）,2022(04):521-528

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