干旱区生态环境知识资源中心(Arid): Salinization depresses soil enzyme activity in metal-polluted soils through increases in metal mobilization and decreases in microbial biomass

Arid

DOI	10.1007/s10646-021-02433-2
	Salinization depresses soil enzyme activity in metal-polluted soils through increases in metal mobilization and decreases in microbial biomass
	Azadi, Nahid; Raiesi, Fayez
通讯作者	Raiesi, F (corresponding author), Shahrekord Univ, Dept Soil Sci & Engn, Fac Agr, POB 115, Shahrekord, Iran.
来源期刊	ECOTOXICOLOGY
ISSN	0963-9292
EISSN	1573-3017
出版年	2021
英文摘要	Salinity may increase metal mobilization with a potentially significant consequence for soil enzymatic activity and nutrient cycling. The goal of this study was to investigate changes in soil enzyme activity in response to salinization of a clay loam soil artificially polluted with cadmium (Cd) and lead (Pb) during a 120-day incubation experiment. Soil samples were polluted with Cd (10 mg Cd kg(-1)), Pb (150 mg Pb kg(-1)), and a combination of Cd and Pb, then preincubated for aging and eventually salinized with three levels of NaCl solution (control, low and high). NaCl salinity consistently increased the mobilization of Cd (12-22%) and Pb (5-16%) with greater increases at high (17-22% for Cd, 9-16% for Pb) than low (12% for Cd, 5-7% for Pb) salinity levels. While the increased Cd mobilization was greater in co-polluted (22%) than Cd-polluted (17%) soils, the increase of Pb mobilization was lower in co-polluted (9%) than Pb-polluted (16%) soils at high salinity level. The salinity-induced increases in metal mobilization significantly depressed soil microbial respiration (up to 43%), microbial biomass content (up to 63%), and enzymatic activities (up to 87%). The multivariate analysis further supported that the increased soil electrical conductivity, Cd mobilization, and pH after salinization were the most important factors governing microbial activity and biomass in metal-polluted soils. Results showed that changes in microbial biomass and mobile metal pool with increasing salinity had a major effect on enzyme activities, particularly under the combined metals. This study indicated that the secondary salinization of metal-polluted soils would impose an additional stress on enzymatic activities as biochemical indicators of soil quality, and therefore should be avoided for the maintenance of soil microbial and biochemical functions, especially in arid regions. In metal-polluted soils, the observed responses of extracellular and intracellular enzymes to salinity can be used to advance our knowledge of microbial processes when modeling the carbon and nutrient cycling.
英文关键词	Soil enzymes Salinity stress Metal toxicity Nutrient cycling Multivariate analysis
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000658992100002
WOS关键词	CADMIUM TOXICITY ; COMMUNITY COMPOSITION ; METABOLIC QUOTIENT ; INDUCED SALINITY ; ORGANIC-CARBON ; HEAVY-METALS ; CD ; PB ; AVAILABILITY ; RESPIRATION
WOS类目	Ecology ; Environmental Sciences ; Toxicology
WOS研究方向	Environmental Sciences & Ecology ; Toxicology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352136
作者单位	[Azadi, Nahid; Raiesi, Fayez] Shahrekord Univ, Dept Soil Sci & Engn, Fac Agr, POB 115, Shahrekord, Iran
推荐引用方式 GB/T 7714	Azadi, Nahid,Raiesi, Fayez. Salinization depresses soil enzyme activity in metal-polluted soils through increases in metal mobilization and decreases in microbial biomass[J],2021.
APA	Azadi, Nahid,&Raiesi, Fayez.(2021).Salinization depresses soil enzyme activity in metal-polluted soils through increases in metal mobilization and decreases in microbial biomass.ECOTOXICOLOGY.
MLA	Azadi, Nahid,et al."Salinization depresses soil enzyme activity in metal-polluted soils through increases in metal mobilization and decreases in microbial biomass".ECOTOXICOLOGY (2021).