Effects of nitrogen addition on soil methane uptake in global forest biomes

被引：34

作者：

Xia, Nan ^{[1
,2
]}

Du, Enzai ^{[1
,2
]}

Wu, Xinhui ^{[1
,2
]}

Tang, Yang ^{[1
,2
]}

Wang, Yang ^{[1
,2
]}

de Vries, Wim ^{[3
,4
]}

机构：

[1] Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China

[2] Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, Beijing 100875, Peoples R China

[3] Wageningen Univ & Res, Environm Res, POB 47, NL-6700 AA Wageningen, Netherlands

[4] Wageningen Univ & Res, Environm Syst Anal Grp, POB 47, NL-6700 AA Wageningen, Netherlands

来源：

ENVIRONMENTAL POLLUTION | 2020年 / 264卷

基金：

中国国家自然科学基金;

关键词：

Nitrogen deposition; Nitrogen addition; Soil methane uptake; Forest; ATMOSPHERIC METHANE; CARBON SEQUESTRATION; DEPOSITION; OXIDATION; CONSUMPTION; TEMPERATE; CHEMISTRY; RESPONSES; SULFUR; MODEL;

D O I：

10.1016/j.envpol.2020.114751

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Nitrogen (N) deposition has been conventionally thought to decrease forest soil methane (CH4) uptake, while the biome specific and dose dependent effect is poorly understood. Based on a meta-analysis of 63 N addition trials from 7 boreal forests, 8 temperate forests, 13 subtropical and 4 tropical forests, we evaluated the effects of N addition on soil CH4 uptake fluxes across global forest biomes. When combining all N addition levels, soil CH4 uptake was insignificantly decreased by 7% in boreal forests, while N addition significantly decreased soil CH4 uptake by 39% in temperate forests and by 21% in subtropical and tropical forests, respectively. Meta-regression analyses, however, indicated a shift from a positive to a negative effect on soil CH4 uptake with increasing N additions both in boreal forests (threshold = 48 kg N ha(-1) yr(-1)) and temperate forests (threshold = 27 kg N ha(-1) yr(-1)), while no such shift was found in subtropical and tropical forests. Considering that current N deposition to most boreal and temperate forests is below the abovementioned thresholds, N deposition likely exerts a positive to neutral effect on soil CH4 uptake in both forest biomes. Our results provide new insights on the biome specific and dose dependent effect of N addition on soil CH4 sink in global forests and suggest that the current understanding that N deposition decreases forest soil CH4 uptake is flawed by high levels of experimental N addition. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：6

共 35 条

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