Does stoichiometric homeostasis differ among tree organs and with tree age?

被引：26

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
]}

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

来源：

FOREST ECOLOGY AND MANAGEMENT | 2019年 / 453卷

基金：

中国国家自然科学基金;

关键词：

Stoichiometric homoeostasis; H; Tree age; Organs; Metasequoia glyptostroboides; PLANT; RESPONSES; NITROGEN; ROOT; SOIL; RESORPTION; CLIMATE; RATIOS; LEAVES; YOUNG;

D O I：

10.1016/j.foreco.2019.117637

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

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.

引用

页数：6

共 37 条

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