Effects of decadal nitrogen addition on carbon and nitrogen stocks in different organic matter fractions of typical steppe soils

doi:10.1016/j.ecolind.2022.109471

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	Effects of decadal nitrogen addition on carbon and nitrogen stocks in different organic matter fractions of typical steppe soils
	Niu, Guoxiang 5; Liu, Li 1,5; Wang, Yinliu 1,5; Guan, Huiling ; Ning, Qiushi 5; Liu, Tao ; Rousk, Kathrin 2; Zhong, Buqing 4; Yang, Junjie 5; Lu, Xiankai 1
刊名	ECOLOGICAL INDICATORS
	2022
卷号	144
关键词	Nitrogen deposition Semiarid area Particulate organic matter Mineral-associated organic matter Subsoil Mongolian Plateau
ISSN号	1470-160X
DOI	10.1016/j.ecolind.2022.109471
文献子类	Article
英文摘要	Recent frameworks have proposed that division of soil organic matter (SOM) into particulate and mineral-associated organic matter (POM and MAOM) can help us better understand SOM cycling and its responses to increasing atmospheric nitrogen (N) deposition. However, responses of these factions to N deposition with combination of their relative distribution across soil profile remain unclear. Here we determined total N and soil organic carbon (SOC) as POM and MAOM separately in soils at depths of 0-10, 30-40 and 70-100 cm after 10-year N addition (at rates of 50, 10, 2 and 0 g m(-2) yr(-1)) in a typical steppe. We further calculated their stocks in POM, MAOM and bulk soil and detected their relationships with both physicochemical features and microbial properties. Nitrogen addition increased the stocks of SOC (POM: +23 %; MAOM: +11 %) and total N (POM: +27 %; MAOM: +10 %) in both POM and MAOM fractions in topsoil (0-10 cm), but increased only in MAOM in 30-40 cm (SOC: +24 %; total N: +24 %) and 70-100 cm (SOC: +15 %; total N: +13 %) soils. Moreover, the increasing effects were strengthened with increasing N addition rates. We found that the share of SOC and total N in the MAOM was slightly decreased by N addition in topsoil, but significantly increased in deeper soils. Soil physicochemical features exerted stronger controls than microbial properties in the distribution of SOC and total N in the two fractions regardless of soil depth. SOC and total N contents of MAOM were correlated negatively with soil pH across the soil profile, and were correlated positively with bulk soil total N, dissolved organic N and inorganic N. Our findings imply that more soil C would be stabilized as MAOM under increasing atmospheric N deposition, and therefore the C saturation level of MAOM should be a target for further studies and be considered in predicting SOM dynamics, especially in N-limited grassland ecosystems.
学科主题	Biodiversity Conservation ; Environmental Sciences
电子版国际标准刊号	1872-7034
出版地	AMSTERDAM
WOS关键词	CLIMATE ; DECOMPOSITION ; PERSISTENCE ; STORAGE ; CLAY
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000864862900005
资助机构	China Postdoctoral Science Foundation [2022M713196] ; National Natural Science Foundation of China [31870440, 32071562, 41905105] ; Foundation of Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28958]
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 100093, Peoples R China 2.Univ Chinese Acad Sci, Yuquan Rd, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Plant Resources Conservat & Sustainable Ut, South China Bot Garden, Guangzhou 510650, Peoples R China 4.Univ Copenhagen, Dept Biol, Univ Sparken15, DK-2100 Copenhagen, Denmark 5.Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, South China Bot Garden, Guangzhou 510650, Peoples R China
推荐引用方式 GB/T 7714	Niu, Guoxiang,Liu, Li,Wang, Yinliu,et al. Effects of decadal nitrogen addition on carbon and nitrogen stocks in different organic matter fractions of typical steppe soils[J]. ECOLOGICAL INDICATORS,2022,144.
APA	Niu, Guoxiang.,Liu, Li.,Wang, Yinliu.,Guan, Huiling.,Ning, Qiushi.,...&Huang, Jianhui.(2022).Effects of decadal nitrogen addition on carbon and nitrogen stocks in different organic matter fractions of typical steppe soils.ECOLOGICAL INDICATORS,144.
MLA	Niu, Guoxiang,et al."Effects of decadal nitrogen addition on carbon and nitrogen stocks in different organic matter fractions of typical steppe soils".ECOLOGICAL INDICATORS 144(2022).