不同阴离子钠盐对土壤Cd形态与微生物群落的影响

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Abstract In order to explore the impact of saline-alkaline stress on soil microbial community structures and Cd availability, different Cd-contaminated soils from wastewater-irrigated agricultural land were collected, the actual saline-alkali environment was simulated by adding the neutral and alkaline salts in different proportions. Soil microcosm incubations were conducted, Illumina high-throughput sequencing of 16S rRNA genes was used to estimate microbial community structures, and basic soil physiochemical properties and Cd content were determined. The results showed that salt addition positively affected sodium adsorption ratio (SAR), alkalinity (ESP), but reduced the content of soil organic carbon (SOC), cation exchange capacity (CEC). Increased soil salinity and alkalinity increased the proportion of small soil aggregates (<0.002mm), and promoted Cd translocation from large aggregates into clay/silt size fractions. Treatment T1 (mainly contained ions of SO₄^2- and Cl^-) enhanced exchangeable Cd content in both test soils by 27.06% and 11.00%. Soil saline-alkali stress decreased bacterial abundance and diversity, comparatively, soil microbial community in T1 showed the highest difference. Meanwhile, salt addition changed major soil bacterial taxa, for example, increased saline stress enriched saline-alkali tolerant taxa Nitriliruptoraceae, Staphylococcaceae, Pseudomonadaceae and heavy-metal resistant taxa Bacillaceae, microbial structure difference under different treatments probably depended the components of soil anions. For instance, comparatively, the abundance of Proteobacteria, Gemmatimonadetes and Bacteroidetes was significantly enriched in T1treatment. Redundancy analysis (RDA) of the abundant bacterial phyla and soil properties suggested that soil pH, exchangeable Cd content, SAR and ESP were the most influential environmental factors driving the changes in community composition, the abundances of Bacteroidetes, Gemmatimonadetes, and Proteobacteria were positively correlated with pH, and the abundances of Chloroflexi and Acidobacteria were strongly positively correlated with soil exchangeable Cd content, SAR. Therefore, saline-alkali stress increased soil Cd availability, significantly altered soil bacterial community.

Key words： wastewater-irrigated soil cadmium availability Cd fractions microbial community

Received: 14 February 2021

PACS:	X53
	X172

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	Articles by authors
	WANG Li-fu
	ZHAO Shu-wen
	LI Shan-shan
	QIN Lu-yao
	SUN Xiao-yi
	LEI Xiao-qin
	CHEN Shi-bao
	WANG Meng

Cite this article:

WANG Li-fu,ZHAO Shu-wen,LI Shan-shan等. Effect of sodium salt with varied anions on Cd fractions and microbial community in soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4221-4230.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4221

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