Responses of growing-season soil respiration to water and nitrogen addition as affected by grazing intensity

doi:10.1111/1365-2435.13118

	Responses of growing-season soil respiration to water and nitrogen addition as affected by grazing intensity
	Li, Jianjun 1; Huang, Yin 1; Xu, Fengwei 1; Wu, Liji 2; Chen, Dima ; Bai, Yongfei
	2018
发表期刊	FUNCTIONAL ECOLOGY
ISSN	0269-8463
卷号	32 期号:7 页码:1890-1901
摘要	1. Most grasslands in the world, including the semi-arid steppe in China, are threatened by nitrogen deposition, precipitation change and livestock grazing, which greatly affect soil carbon processes (e.g. soil respiration). Although the individual effects of nitrogen deposition and precipitation change on soil respiration are well understood, how their effects on soil respiration are altered by different grazing intensities is unclear. 2. To determine how the effects of nitrogen deposition and precipitation change on soil respiration are affected by grazing intensity, we conducted an experiment in a semi-arid steppe involving areas that experienced 10 years of no, light, moderate or heavy grazing. These areas were treated with water addition (110 mm, 30% of the mean annual precipitation) and nitrogen addition (10.5 g m(-2) year(-1)). 3. Our results showed that relative to no grazing, grazing decreased growing-season soil respiration by 10%-19%. The decline in soil respiration was mainly via its negative effects on above-ground net primary productivity (ANPP) and the fungi: bacteria ratio with light grazing, mainly via its negative effects on ANPP and leaf nitrogen content with moderate grazing, and mainly via its negative effects on ANPP, root biomass, microbial biomass and the fungi: bacteria ratio with heavy grazing. 4. Across all grazing intensities, both water and water+nitrogen addition increased growing-season soil respiration, whereas nitrogen addition decreased growing-season soil respiration. Water addition increased growing-season soil respiration mostly via its positive effect on ANPP with no grazing and with low grazing, and mostly via its positive effects on both plant and microbial variables with moderate and heavy grazing. The pathways determining the nitrogen addition-induced decline in growing-season soil respiration were the same within each of the four levels of grazing and mostly resulted from its negative effect on microbial variables. 5. Our results indicate that the effects of climate change on growing-season soil respiration and other soil carbon processes in grasslands depend on grazing intensity. The findings suggest that grazing intensity should be considered in future manipulation experiments and should be included in carbon models to accurately simulate soil carbon dynamics under scenarios of climate change in grassland ecosystems.
关键词	grazing history multiple anthropogenic stressors nitrogen deposition precipitation change soil carbon cycling
学科领域	Ecology
DOI	10.1111/1365-2435.13118
收录类别	SCI
语种	英语
WOS关键词	BELOW-GROUND CARBON ; MICROBIAL COMMUNITIES ; TERRESTRIAL ECOSYSTEMS ; GRASSLAND ECOSYSTEMS ; ALPINE MEADOW ; PRECIPITATION ; TEMPERATURE ; MANAGEMENT ; STEPPE ; SEQUESTRATION
WOS记录号	WOS:000437281100021
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1365-2435
资助机构	Chinese National Key Development Program for Basic Research [2016YFC0500804, 2015CB954201] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31570450, 31320103916] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences [2015061]
作者邮箱	chendima@ibcas.ac.cn ; yfbai@ibcas.ac.cn
引用统计	被引频次：39[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/20641
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm, Hohhot, Peoples R China
推荐引用方式 GB/T 7714	Li, Jianjun,Huang, Yin,Xu, Fengwei,et al. Responses of growing-season soil respiration to water and nitrogen addition as affected by grazing intensity[J]. FUNCTIONAL ECOLOGY,2018,32(7):1890-1901.
APA	Li, Jianjun,Huang, Yin,Xu, Fengwei,Wu, Liji,Chen, Dima,&Bai, Yongfei.(2018).Responses of growing-season soil respiration to water and nitrogen addition as affected by grazing intensity.FUNCTIONAL ECOLOGY,32(7),1890-1901.
MLA	Li, Jianjun,et al."Responses of growing-season soil respiration to water and nitrogen addition as affected by grazing intensity".FUNCTIONAL ECOLOGY 32.7(2018):1890-1901.

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