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Dynamic responses of soil enzymes at key growth stages in rice after the in situ remediation of paddy soil contaminated with cadmium and arsenic

化学 尿素酶 修正案 肥料 环境修复 酸性磷酸酶 酶分析 过氧化氢酶 环境化学 土壤污染 土壤pH值 土壤肥力 土壤水分 农学 动物科学 污染 生物化学 环境科学 土壤科学 生物 生态学 有机化学 政治学 法学
作者
Yi Jiang,Xuan-Tao Yi,Mengyu Liu,Beibei Liu,Hang Zhou,Peng Zeng,Bo‐Han Liao,Jiao-Feng Gu
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:830: 154633-154633 被引量:23
标识
DOI:10.1016/j.scitotenv.2022.154633
摘要

The practical application of in situ remediation techniques requires an understanding of the dynamic changes in soil enzyme activity as indicators of soil fertility and health. Experiments were carried out in paddy soils co-contaminated with cadmium (Cd) and arsenic (As) at low (L) and high (H) levels. A calcium and iron (CaFe)-based amendment (limestone + iron powder + silicon fertilizer + calcium‑magnesium-phosphate fertilizer) was applied to the soil at concentrations of 0, 450, and 900 g·m-2 (labeled CK, T1, and T2, respectively), and sampling was conducted at the tillering (TS), booting (BS), filling (FS), and mature (MS) stages. In soil L, urease activity increased significantly by 15.8% under T1 treatment at the MS, catalase activity increased significantly under T2 treatment by 52.4% at the FS and 25.9% at the MS, and acid phosphatase activity increased significantly by 50.1%-65.9% at the TS. For soil H, urease activity increased by maximum values of 101.6% and 28.6% at the FS and MS, respectively. Catalase activity increased by 29.0% at the MS under T2 treatment, and acid phosphatase activity increased by maximum values of 40.5%, 16.0%, and 53.9% at the BS, FS, and MS, respectively. The results indicate that the changes in soil enzyme activity were mainly related to the rice growth stage, soil pH, and available Cd and As after the application of Ca-Fe-based amendment. Overall, at the FS and MS, the amendment increased the soil pH, soil enzyme activity, and cation exchange capacity and reduced the available Cd and As, which reduced the Cd and As contents in brown rice.
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