干旱区生态环境知识资源中心(Arid): Responses of soil respiration and its temperature sensitivity to nitrogen addition: A meta-analysis in China

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DOI	10.1016/j.apsoil.2019.103484
	Responses of soil respiration and its temperature sensitivity to nitrogen addition: A meta-analysis in China
	Xiao, Haibing 1; Shi, Zhihua 1; Li, Zhongwu 2,3; Wang, Ling 1; Chen, Jia 3; Wang, Jian 1
通讯作者	Shi, Zhihua ; Li, Zhongwu
来源期刊	APPLIED SOIL ECOLOGY
ISSN	0929-1393
EISSN	1873-0272
出版年	2020
卷号	150
英文摘要	Annual atmospheric nitrogen (N) deposition in China increased approximately 8 kg N ha(-1) from the 1980s to the 2000s, which may have greatly affected soil respiration (R-s) and its temperature sensitivity (Q(10)). Although numerous individual studies have been conducted, the responses of R-s to simulated N deposition remain controversial. To reconcile the conflicting results of R-s and expand our knowledge about the response of Q(10) to N addition, a dataset with 333 independent observations in China was compiled, and a meta-analysis was performed. Our results showed that N addition increased R-s by 7.1% (P < 0.05) across all biomes. The positive response degree of R-s in croplands (27.0%, P < 0.05) was significantly greater than those in the grassland and forest biomes, which indicated that R-s in anthropogenic ecosystems might be more sensitive to N enrichment. In contrast to low and medium N levels (<= 20 g m(-2) yr(-1)), high N addition levels (> 20 g m(-2) yr(-1)) inhibited R-s due to a decrease in plant fine root biomass (RB). Compared with ammonium nitrate, urea is more likely to stimulate the release of soil C. Regression models showed that the R-s response ratio (RR) was positively correlated with pH and the RRs of microbial biomass carbon (MBC) and RB. Increases in both plant roots and microbial biomass induced by N addition directly promoted R-s, and N enrichment likely increases R-s in soil with a high pH. The temperature sensitivity parameter, Q(10), decreased by 3.7% (P < 0.05) across all biomes and showed an overall negative response for different biomes (except wetlands and deserts), N addition levels and N types. The Q(10) response ratio was positively correlated with the RR of pH. Soil acidification induced by proton release during N fertilizer transformation might accelerate the decomposition of recalcitrant organic matter and further decrease the Q(10) value. Our study provides valuable information to Chinese environmental policy- and decision-makers in their attempts to evaluate the effects of N deposition on terrestrial ecosystem C cycle.
英文关键词	Nitrogen deposition Soil respiration Temperature sensitivity Meta-analysis
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000512886800032
WOS关键词	CARBON SEQUESTRATION ; FOREST ; DEPOSITION ; DECOMPOSITION ; ECOSYSTEMS
WOS类目	Soil Science
WOS研究方向	Agriculture
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319257
作者单位	1.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Hubei, Peoples R China; 2.Hunan Normal Univ, Coll Resources & Environm Sci, Changsha 410082, Hunan, Peoples R China; 3.Inst Soil & Water Conservat CAS & MWR, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Haibing,Shi, Zhihua,Li, Zhongwu,et al. Responses of soil respiration and its temperature sensitivity to nitrogen addition: A meta-analysis in China[J]. 西北农林科技大学,2020,150.
APA	Xiao, Haibing,Shi, Zhihua,Li, Zhongwu,Wang, Ling,Chen, Jia,&Wang, Jian.(2020).Responses of soil respiration and its temperature sensitivity to nitrogen addition: A meta-analysis in China.APPLIED SOIL ECOLOGY,150.
MLA	Xiao, Haibing,et al."Responses of soil respiration and its temperature sensitivity to nitrogen addition: A meta-analysis in China".APPLIED SOIL ECOLOGY 150(2020).