干旱区生态环境知识资源中心(Arid): Long-term mulched drip irrigation facilitates soil organic carbon stabilization and the dominance of microbial stochastic assembly processes

Arid

DOI	10.1016/j.agwat.2024.109008
	Long-term mulched drip irrigation facilitates soil organic carbon stabilization and the dominance of microbial stochastic assembly processes
	Liu, Jieyun; Qiu, Husen; He, Shuai; Tian, Guangli
通讯作者	Qiu, HS
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2024
卷号	302
英文摘要	Mulched drip irrigation (MDI) is generally accepted as a method to decrease soil salinization and improve crop yields in arid and semi-arid regions. However, there remain gaps in how MDI drives soil organic carbon (SOC) dynamic microbial assembly processes with time, and the mediating role of microorganisms remains unclear. In this study, we investigated the aforementioned issues across soil profiles in cotton fields with different years of MDI. The results showed that MDI did not cause the differences in SOC, particular organic carbon (POC), and mineral-associated organic carbon (MOC) in soil layers. The POC and MOC contents had a parabola relationship with time, and showed an opposite trend in soil. After 15 years of MDI, the ratio of MOC/SOC increased to a peak value of 50 % and 52 % in topsoil and subsoil, respectively; the ratio of POC/SOC decreased to valley values of 50 % and 48 %, respectively (P < 0.05). Long-term MDI reduced the differences in oxidase between soil layers but accelerated SOC loss by increasing polyphenol oxidase activity (P < 0.05). Compared with that of other years, with 10 years of MDI, bacterial Shannon diversity decreased to a valley value, and fungal Shannon diversity reached to a top value in subsoil (P < 0.05). In general, stochastic processes were mainly controlled by dispersal limitation, and undominated processes dominated microbial assembly; however, there was a close relationship between bacterial communities and organic carbon fractions. The high percentage of positive linkages among microorganisms indicated that long-term MDI was beneficial for carbon fixation. Additionally, a decrease of fungal oligotroph/copiotroph ratio, the relative abundance of Ascomycota and Basidiomycota was beneficial for the accumulation of SOC and POC in topsoil (P < 0.05). In conclusion, long-term MDI is useful for the fixation of organic carbon via improving soil POC content and strengthening linkages within community assemblies.
英文关键词	Carbon stabilization Bacterial and fungal communities Assembly processes Enzyme activities Oligotroph/copiotroph ratios
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001298593100001
WOS关键词	SALTWATER INTRUSION ; MATTER ; BACTERIAL ; COMMUNITIES ; MECHANISMS ; FUNGAL ; WATER ; CLASSIFICATION ; DECOMPOSITION ; FRACTIONS
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402693
推荐引用方式 GB/T 7714	Liu, Jieyun,Qiu, Husen,He, Shuai,et al. Long-term mulched drip irrigation facilitates soil organic carbon stabilization and the dominance of microbial stochastic assembly processes[J],2024,302.
APA	Liu, Jieyun,Qiu, Husen,He, Shuai,&Tian, Guangli.(2024).Long-term mulched drip irrigation facilitates soil organic carbon stabilization and the dominance of microbial stochastic assembly processes.AGRICULTURAL WATER MANAGEMENT,302.
MLA	Liu, Jieyun,et al."Long-term mulched drip irrigation facilitates soil organic carbon stabilization and the dominance of microbial stochastic assembly processes".AGRICULTURAL WATER MANAGEMENT 302(2024).