干旱区生态环境知识资源中心(Arid): Grassland degradation with saline-alkaline reduces more soil inorganic carbon than soil organic carbon storage

Arid

DOI	10.1016/j.ecolind.2021.108194
	Grassland degradation with saline-alkaline reduces more soil inorganic carbon than soil organic carbon storage
	Xu, Tongtong; Zhang, Minna; Ding, Shiwen; Liu, Bai; Chang, Qing; Zhao, Xuan; Wang, Ying; Wang, Jianyong; Wang, Ling
通讯作者	Wang, L (corresponding author), Northeast Normal Univ, Jilin Songnen Grassland Ecosyst Natl Observat & R, Minist Educ, Inst Grassland Sci,Key Lab Vegetat Ecol, Changchun 130024, Peoples R China.
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2021
卷号	131
英文摘要	Grassland is an important part of terrestrial ecosystems and contain substantial amounts of soil carbon. However, 90% of grasslands suffer from degradation in northern China, where soil inorganic carbon (SIC) is a major reservoir. Previous studies have focused primarily on soil organic carbon (SOC) stock, while the effects of grassland degradation in SIC stock remains largely unexplored. Therefore, accurate assessments of both SOC and SIC stocks and their profile distributions are necessary to fully understand the role of grassland degradation in China's carbon budget. Here, we conducted an experiment to estimate the stocks, profile distributions, and environmental controls of both SOC and SIC in patchy saline-alkaline grasslands under three degraded degrees (non-degraded patches, ND; moderately degraded patches, MD, and heavily degraded patches, HD). Our results showed that grassland degradation destroys not only SOC but also SIC stocks in saline-alkaline grasslands. SIC is the main component of soil carbon in saline-alkaline grasslands, and their distributions changed dramatically. Compared with ND, SIC losses caused by degradation accounted for 84% and 86% of total carbon loss under MD and HD patches, respectively. SIC loss primarily occurred at the intermediate soil layers (30-70 cm), while the loss of SOC was mainly in the topsoil (0-40 cm). Moreover, the distributions of SIC from 20 to 60 cm were closely related to soil pH, while it is mainly regulated by EC from 60 to 100 cm. In addition, soil pH, EC, and above-ground biomass were important variables driving the profile distributions of SOC in the upper soil. Our work provides evidence that grassland degradation mainly damages the SIC stocks. Our findings, therefore, highlight the non-negligible role of SIC dynamics in the carbon budget of degraded grassland ecosystems and the need to consider these dynamics in terrestrial carbon cycle research.
英文关键词	Degraded grasslands Carbon stocks Soil organic carbon Soil inorganic carbon Profile distributions Soil salinization Soil carbonate
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000704539100002
WOS关键词	LAND-USE CHANGE ; NET ECOSYSTEM ; STOCKS ; SEQUESTRATION ; RESTORATION ; DESERT ; CO2 ; VEGETATION ; DYNAMICS ; CLIMATE
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363011
作者单位	[Xu, Tongtong; Zhang, Minna; Ding, Shiwen; Liu, Bai; Chang, Qing; Zhao, Xuan; Wang, Ying; Wang, Jianyong; Wang, Ling] Northeast Normal Univ, Jilin Songnen Grassland Ecosyst Natl Observat & R, Minist Educ, Inst Grassland Sci,Key Lab Vegetat Ecol, Changchun 130024, Peoples R China
推荐引用方式 GB/T 7714	Xu, Tongtong,Zhang, Minna,Ding, Shiwen,et al. Grassland degradation with saline-alkaline reduces more soil inorganic carbon than soil organic carbon storage[J],2021,131.
APA	Xu, Tongtong.,Zhang, Minna.,Ding, Shiwen.,Liu, Bai.,Chang, Qing.,...&Wang, Ling.(2021).Grassland degradation with saline-alkaline reduces more soil inorganic carbon than soil organic carbon storage.ECOLOGICAL INDICATORS,131.
MLA	Xu, Tongtong,et al."Grassland degradation with saline-alkaline reduces more soil inorganic carbon than soil organic carbon storage".ECOLOGICAL INDICATORS 131(2021).