Effects of Exogenous L-aspartic Acid Nano-calcium on Physical and Chemical Properties and Microbial Community Distribution in Cadmium Contaminated Soil

doi:10.11924/j.issn.1000-6850.casb2024-0444

Abstract

Abstract:

To explore the effect of exogenous L-aspartic acid nano-calcium (NPs-Ca) on the physical and chemical properties and the distribution of microbial community in cadmium (Cd)-contaminated soil, a pot experiment was conducted with setting up 3 treatments: CK (no Ca application), Ca (CaCl₂ application) and NPs-Ca (NPs-Ca application). In this experiment, the basic physical and chemical properties of soil, the total amount of cadmium and the content of different forms of cadmium were determined to further understand the causes of changes, the structure and distribution of soil microbial communities were analyzed by high-throughput sequencing. The results showed that compared with CK, CaCl₂ application significantly increased the soil water-soluble Ca content, but had no impact on soil pH, other nutrient content and content of different forms of Cd. However, NPs-Ca application obvious increased the soil alkaline nitrogen and water-soluble Ca content, and effectively reduced the content of total Cd and available Cd in the soil. NPs-Ca also affected soil microbial abundance, resulting in a significant decrease in the relative abundance of Proteobacteria microorganisms, and a significant increase in the proportion of Actinobacteria and Firmicutes microorganisms that had a positive impact on soil and plant growth. Furthermore, unlike the application of CaCl₂, the application of NPs-Ca did not reduce the number and diversity of soil microorganisms. The results provided a theoretical basis for the remediation of Cd contaminated soil and enrichment of the abundance of beneficial microorganisms by applying NPs-Ca.

Key words: cadmium (Cd)-contaminated soil, L-aspartic acid nano-calcium, soil nutrient, cadmium, physical and chemical properties, microbial community, soil microorganism, high-throughput sequencing

TANG Xu, TIAN Hui, ZHANG Haoran, CHAI Guohua, WU Xiuwen. Effects of Exogenous L-aspartic Acid Nano-calcium on Physical and Chemical Properties and Microbial Community Distribution in Cadmium Contaminated Soil[J]. Chinese Agricultural Science Bulletin, 2025, 41(2): 98-108.

Figures/Tables 9

References 49

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级别	一级	二级			三级
pH	自然背景值	<6.5	6.5~7.5	>7.5	>6.5
Cd	≤0.20	≤0.30	≤0.30	≤0.60	≤1.00

级别	一级	二级			三级
pH	自然背景值	<6.5	6.5~7.5	>7.5	>6.5
Cd	≤0.20	≤0.30	≤0.30	≤0.60	≤1.00