Salinity Induces Allometric Accumulation of Sulfur in Plants and Decouples Plant Nitrogen-Sulfur Correlation in Alpine and Arid Wetlands

被引：4

作者：

Zuo, Zhenjun ^{[1
]}

Zhao, Haocun ^{[1
]}

Yang, Lei ^{[1
]}

Lv, Tian ^{[1
]}

Li, Xiangyan ^{[1
]}

Ma, Fei ^{[1
]}

Wang, Zhong ^{[1
]}

Yu, Dan ^{[1
]}

机构：

[1] Wuhan Univ, Dept Ecol, Coll Life Sci, Wuhan, Peoples R China

来源：

GLOBAL BIOGEOCHEMICAL CYCLES | 2022年 / 36卷 / 12期

基金：

中国国家自然科学基金;

关键词：

alpine wetlands; arid and semi-arid region; biogeochemical cycles; ecological stoichiometry; functional traits; Tibetan Plateau; AQUATIC MACROPHYTES; SOIL; ASSIMILATION; VARIABILITY; HOMEOSTASIS; PHOSPHORUS; PATTERNS; TRAITS; LONG; SALT;

D O I：

10.1029/2022GB007372

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Salinization alters the elemental balance of wetlands and induces variations in plant survival strategies. Sulfur (S) plays vital roles in serving regulatory and catalytic functions in stress resistance of plants. Yet, how plant S and its relationships with nitrogen (N) vary across natural environmental gradients are not well documented. We collected 1,366 plant samples and 230 water and sediment samples from 230 wetlands in Tibetan Plateau and adjacent arid regions of western China, to analyze the effects of environmental variables on plant S accumulation and N-S correlations. We found that plant S correlated with N in unimodal patterns. Salinity, rather than temperature or nutrient supply, promoted disproportionate accumulation of S but limited N uptake, inducing decoupling of N-S correlation in plants. Toward high salinity, the faster increasing rates of total S than that of glutathione, the most abundant organic-S compound in plant resistance, provided potential evidences explaining the decoupled plant N-S correlation. A salinity of 3.9 was calculated to be a threshold at which substantial changes in plant N-S correlation occurred. We designed a conceptual model to illustrate the mechanisms driving variations of N-S correlation in plants and environments along salinity gradient. Furthermore, high salinity filtered out the salt-sensitive species and reassembled the communities. In conclusion, increased salinity affected wetland plants by inducing S accumulation in plants and selecting salt-tolerant species with high S concentrations at community level, providing evidences for plant adaptive mechanisms to salinity in arid regions.

引用

页数：14