Water-dominated negative effects of nitrogen enrichment on soil respiration in a temperate steppe

被引：6

作者：

Li, Kunyu ^{[1
]}

Niu, Mengnan ^{[1
]}

Bai, Wenming ^{[2
]}

Yang, Zhongling ^{[1
]}

Li, Guoyong ^{[1
]}

机构：

[1] Henan Univ, Sch Life Sci, Int Joint Res Lab Global Change Ecol, Kaifeng 475004, Peoples R China

[2] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China

来源：

APPLIED SOIL ECOLOGY | 2021年 / 165卷

基金：

中国国家自然科学基金;

关键词：

Global change; Nitrogen deposition; Nonlinear response; Soil carbon flux; Soil moisture; Temperate grassland; CARBON STORAGE; DEPOSITION; RESPONSES; FLUXES; FERTILIZATION; BIODIVERSITY; ECOSYSTEMS; GRASSLAND; MICROBES; BIOMASS;

D O I：

10.1016/j.apsoil.2021.104023

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Soil respiration (SR) has been demonstrated to be affected by nitrogen (N) enrichment. However, most studies examine the effect of N enrichment on SR using only two levels of N treatments (i.e. control vs N enrichment). Current understanding of SR responses to varying rates of N enrichment remains unclear. A field manipulative experiment with eight levels of N addition (0, 1, 2, 4, 8, 16, 32, 64 g N m(-2) yr(-1)) was performed to examine SR responses to N enrichment rates in a temperate steppe of northern China. A nonlinear decrease in SR along N addition gradient was observed in the temperate steppe. N addition decreased SR mainly through reducing soil moisture in this study. These findings facilitate accurate estimation of soil C flux in the scenario of intensified N enrichment.

引用

页数：5

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