干旱区生态环境知识资源中心(Arid): Soil calcium prompts organic carbon accumulation after decadal saline-water irrigation in the Taklamakan desert

Arid

DOI	10.1016/j.jenvman.2023.118421
	Soil calcium prompts organic carbon accumulation after decadal saline-water irrigation in the Taklamakan desert
	Feng, Wenting; Jiang, Jiang; Lin, Litao; Wang, Yugang
通讯作者	Wang, YG
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2023
卷号	344
英文摘要	Soil organic carbon (SOC), as a crucial measure of soil quality, is typically low in arid regions due to salinization, which is a global issue. How soil organic carbon changes with salinization is not a simple concept, as high salinity simultaneously affects plant inputs and microbial decomposition, which exert opposite effects on SOC accu-mulation. Meanwhile, salinization could affect SOC by altering soil Ca2+ (a salt component), which stabilizes organic matter via cation bridging, but this process is often overlooked. Here, we aimed to explore i) how soil organic carbon changes with salinization induced by saline-water irrigation and ii) which process drives soil organic carbon content with salinization, plant inputs, microbial decomposition, or soil Ca2+ level. To this end, we assessed SOC content, plant inputs represented by aboveground biomass, microbial decomposition revealed by extracellular enzyme activity, and soil Ca2+ along a salinity gradient (0.60-31.09 g kg-1) in the Taklamakan Desert. We found that, in contrast to our prediction, SOC in the topsoil (0-20 cm) increased with soil salinity, but it did not change with the aboveground biomass of the dominant species (Haloxylon ammodendron) or the activity of three carbon-cycling relevant enzymes (& beta;-glucosidase, cellulosidase, and N-acetyl-beta-glucosaminidase) along the salinity gradient. Instead, SOC changed positively with soil exchangeable Ca2+, which increased linearly with salinity. These results suggest that soil organic carbon accumulation could be driven by increases in soil exchangeable Ca2+ under salinization in salt-adapted ecosystems. Our study provides empirical evidence for the beneficial impact of soil Ca2+ on organic carbon accumulation in the field under salinization, which is apparent and should not be disregarded. In addition, the management of soil carbon sequestration in salt-affected areas should be taken into account by adjusting the soil exchangeable Ca2+ level.
英文关键词	Aboveground plant biomass Enzyme activity Salinity gradient Salinization Haloxylon ammodendron Cation bridging
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001035243600001
WOS关键词	ENZYME-ACTIVITIES ; SALT TOLERANCE ; SALINIZATION ; IMPACT ; MATTER ; CLAY ; STABILIZATION ; RESPIRATION ; ENVIRONMENT ; MECHANISMS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397291
推荐引用方式 GB/T 7714	Feng, Wenting,Jiang, Jiang,Lin, Litao,et al. Soil calcium prompts organic carbon accumulation after decadal saline-water irrigation in the Taklamakan desert[J],2023,344.
APA	Feng, Wenting,Jiang, Jiang,Lin, Litao,&Wang, Yugang.(2023).Soil calcium prompts organic carbon accumulation after decadal saline-water irrigation in the Taklamakan desert.JOURNAL OF ENVIRONMENTAL MANAGEMENT,344.
MLA	Feng, Wenting,et al."Soil calcium prompts organic carbon accumulation after decadal saline-water irrigation in the Taklamakan desert".JOURNAL OF ENVIRONMENTAL MANAGEMENT 344(2023).