Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland

doi:10.1016/j.geoderma.2021.115541

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	Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland
	Diao, Huajie 2,3; Chen, Xiaopeng 2; Zhao, Xiang 2; Dong, Kuanhu 2; Wang, Changhui 2,3
刊名	GEODERMA
	2022
卷号	406
关键词	Nitrogen addition Drought Precipitation increase Autotrophic respiration Heterotrophic respiration Saline-alkaline grassland
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2021.115541
文献子类	Article
英文摘要	The responses of soil total respiration (R-s) and its components (soil autotrophic respiration (R-a) and heterotrophic respiration (R-h)) to nitrogen (N) deposition have been widely evaluated in non-saline-alkaline grasslands. However, their responses to N addition under drought and wet conditions, especially in saline-alkaline grasslands, remain unclear. A two-factorial experiment involving N addition and precipitation changes (decreased or increased 50% precipitation relative to ambient) was conducted in a saline-alkaline grassland of Northern China, while soil respiration was measured in different treatment plots during two growing seasons (2018, 2019). Results showed that the addition of N or changes in precipitation alone had no significant effect on R-s, R-a or R-h in both years because root productivity and soil microbial biomass were not affected. However, N addition with increased precipitation synergistically augmented seasonal mean R-s and R-a by 25.7% and 46.8% in 2018, and by 42.4% and 89.3% in 2019, respectively, owing to the increase in plant productivity. The variation in R-a primarily contributed to variation in R-s, and the effect size of N addition on R-s and R-a were increased with precipitation. In addition, a structural equation model showed that the response of soil respiration to N addition and precipitation changes was regulated by soil salinization, in which the R-a was regulated by soil based cations while R-h was controlled by soil pH values. Our study highlights that N addition with increased precipitation preferentially affects plants rather than microorganisms, and that R-h was not sensitive to N addition and precipitation changes in saline-alkaline grassland.
学科主题	Soil Science
电子版国际标准刊号	1872-6259
出版地	AMSTERDAM
WOS关键词	TEMPERATURE SENSITIVITY ; EXTREME PRECIPITATION ; CARBON BALANCE ; WATER CONTENT ; COMMUNITY ; RESPONSES ; DEPOSITION ; FERTILIZATION ; PRODUCTIVITY ; INCREASES
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000725534500005
资助机构	National Key R&D Program of China [2017YFA0604802] ; National Natural Science Foundation of China [31872406, 31870438, 31800402] ; Research projects of Shanxi Province's doctoral graduates and postdoctoral researchers working in Shanxi Province [SXBYKY2021053]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28895]
专题	植被与环境变化国家重点实验室
作者单位	1.Shanxi Agr Univ, Youyu Loess Plateau Grassland Ecosyst Res Stn, Taigu 030801, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Shanxi Agr Univ, Coll Grassland Sci, Taigu 030801, Peoples R China
推荐引用方式 GB/T 7714	Diao, Huajie,Chen, Xiaopeng,Zhao, Xiang,et al. Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland[J]. GEODERMA,2022,406.
APA	Diao, Huajie,Chen, Xiaopeng,Zhao, Xiang,Dong, Kuanhu,&Wang, Changhui.(2022).Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland.GEODERMA,406.
MLA	Diao, Huajie,et al."Effects of nitrogen addition and precipitation alteration on soil respiration and its components in a saline-alkaline grassland".GEODERMA 406(2022).