文献类型：期刊文献

英文题名：Does stoichiometric homeostasis differ among tree organs and with tree age?

作者：Wang, Jiannan[1,2] Wang, Jiangyuan[1] Wang, Lei[1] Zhang, Hui[1] Guo, Ziwu[1] Wang, G. Geoff[3] Smith, William K.[4] Wu, Tonggui[1]

第一作者：Wang, Jiannan

通信作者：Wu, TG[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, East China Coastal Forest Ecosyst Long Term Res S, Hangzhou 311400, Zhejiang, Peoples R China;[2]Nanjing Forestry Univ, Nanjing 210037, Jiangsu, Peoples R China;[3]Clemson Univ, Dept Forestry & Environm Conservat, Clemson, SC 29634 USA;[4]Wake Forest Univ, Dept Biol, Winston Salem, NC 27106 USA

年份：2019

卷号：453

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;EI(收录号：20194207543292);Scopus(收录号：2-s2.0-85073256096);WOS:【SCI-EXPANDED(收录号:WOS:000496607200046)】；

基金：This work was supported by the Fundamental Research Funds for National Natural Science Foundation of China (31770756) and the Central Non-profit Research Institution of CAF (CAFYBB2014ZD002).

语种：英文

外文关键词：Stoichiometric homoeostasis; H; Tree age; Organs; Metasequoia glyptostroboides

摘要：The degree of stoichiometric homeostasis can be indicated by the homeostatic coefficient (H), which reflects the ability of plants to maintain a stable nutrient composition regardless of changes in environmental nutrients. In previous studies, H had been determined primarily in herbs and varied significantly among organs and growth stages. However, whether H varies according to organ-type and age in tree species is unknown. In this study, nitrogen (N) and phosphorus (P) fertilization experiments were conducted in young and mature Metasequoia glyptostroboides plantation stands. The H of N (H-N) and H of N:P (H-N:P) was found in young trees, H of P (H-P) and H-N:P existed in mature trees. Also, leaf H-N:P of mature trees was greater than that of young trees (P < 0.05), and H showed significant difference among organs in mature trees (P < 0.05), but not in young trees (P > 0.05). Thus, stoichiometric homeostasis varied with tree age and among organs, and leaf N:P was more tightly constrained in mature trees than in young trees. These findings imply that stoichiometric homeostasis is coupled to tree growth and development, which suggest N limitation for young trees and P limitation for mature trees, at least in M. glyptostroboides.