气候变化领域集成服务门户(CCPortal): Nitrogen addition increases topsoil carbon stock in an alpine meadow of the Qinghai-Tibet Plateau

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DOI	10.1016/j.scitotenv.2023.164071
	Nitrogen addition increases topsoil carbon stock in an alpine meadow of the Qinghai-Tibet Plateau
	Liu, Jianliang; Zhan, Wei; Huang, Xinya; Tang, Di; Jin, Shaofei; Zhu, Dan; Chen, Huai
发表日期	2023
ISSN	0048-9697
EISSN	1879-1026
卷号	888
英文摘要	Soil carbon (C) sequestration plays a critical role in mitigating climate change. Nitrogen (N) deposition greatly affects soil C dynamics by altering C input and output. However, how soil C stocks respond to various forms of N input is not well clear. This study aimed to explore the impact of N addition on soil C stock and to elucidate the underlying mech-anisms in an alpine meadow on the eastern Qinghai-Tibet Plateau. The field experiment involved three N application rates and three N forms, using a non-N treatment as a control. After six years of N addition, the total C (TC) stocks in the topsoil (0-15 cm) were markedly increased by an average of 12.1 %, with a mean annual rate of 20.1 parts per thousand, and no dif-ference was found between the N forms. Irrespective of rate or form, N addition significantly increased the topsoil mi-crobial biomass C (MBC) content, which was positively correlated with mineral-associated and particulate organic C content and was identified as the most important factor that affecting the topsoil TC. Meanwhile, N addition signifi-cantly increased the aboveground biomass in the years with moderate precipitation and relatively high temperature, which leads to higher C input into soils. Owing to decreased pH and/or activities of beta-1,4-glucosidase (beta G) and cellobiohydrolase (CBH) in the topsoil, organic matter decomposition was most likely inhibited by N addition, and this inhibiting effect varied under different N forms. Additionally, TC content in the topsoil and subsoil (15-30 cm) exhibited parabolic and positive linear relationship with the topsoil dissolved organic C (DOC) content, respectively, indicating that DOC leaching might be an important influencing factor for soil C accumulation. These findings improve
关键词	Nitrogen deposition Nitrogen form Soil carbon sequestration Soil carbon fractions Soilacidification C-degrading enzyme activity
英文关键词	EXTRACELLULAR ENZYME-ACTIVITIES; SOIL CARBON; MICROBIAL COMMUNITIES; ATMOSPHERIC NITROGEN; FERTILIZATION; PLANT; DEPOSITION; BIOMASS; METAANALYSIS; AMMONIUM
WOS研究方向	Environmental Sciences
WOS记录号	WOS:001002637000001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283181
作者单位	Chinese Academy of Sciences; Chengdu Institute of Biology, CAS; Sichuan Agricultural University; Minjiang University; Chinese Academy of Sciences; Chengdu Institute of Biology, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Liu, Jianliang,Zhan, Wei,Huang, Xinya,et al. Nitrogen addition increases topsoil carbon stock in an alpine meadow of the Qinghai-Tibet Plateau[J],2023,888.
APA	Liu, Jianliang.,Zhan, Wei.,Huang, Xinya.,Tang, Di.,Jin, Shaofei.,...&Chen, Huai.(2023).Nitrogen addition increases topsoil carbon stock in an alpine meadow of the Qinghai-Tibet Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,888.
MLA	Liu, Jianliang,et al."Nitrogen addition increases topsoil carbon stock in an alpine meadow of the Qinghai-Tibet Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 888(2023).