Carbon-nitrogen-phosphorus level regulation of potentially toxic elements and enzyme activities in paddy soil aggregates: Straw and organic fertilizer effects

文献类型： 外文期刊

第一作者： Zhao, Keqi

作者： Zhao, Keqi;Xiao, Wenbo;Wang, Nanyi;Zhang, Jiachao;Chen, Anwei;Luo, Lin;Zhao, Xichen;Zhao, Keqi;Xiao, Wenbo;Wang, Nanyi;Peng, Hua;Zhang, Jiachao;Chen, Anwei;Wan, Dan;Luo, Lin;He, Liuqin;Zhao, Xichen;Zhang, Xiaobing;Wang, Ying;Peng, Hua;Qi, Renli;Wan, Dan;He, Liuqin;Zhao, Xichen;Yu, Fangying;Wan, Dan;He, Liuqin;Zhao, Xichen

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关键词： Organic amendments; Soil biochemical indicators; Sustainable field management; Bioavailability

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 5 期

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收录情况： SCI

摘要： Excessive application of chemical fertilizers caused soil nutrient imbalances and organic matter depletion in agricultural lands. Organic substitution can help achieve sustainable agriculture by influencing the carbon-nitrogen-phosphorus (CNP) nutritional balance of soil aggregates and controlling soil microbial activity. However, the effects of straw return to the field (SRF, 3000 kg hm-2) and organic fertilizer application (OFA, 3000 kg ha-1) on the distribution of CNP and potentially toxic elements in paddy soil aggregates remain unclear. A field experiment was conducted to explore the effects of the combination of straw and organic fertilizer (SRF/ OFA). Results showed OFA increased total carbon (TC), total nitrogen (TN), and total phosphorus (TP) levels. SRF/OFA increased TP in microaggregates, and TC and TN in macroaggregates. SRF and OFA increased urease activity by 47.73-66.89 % and 50.60-58.10 % respectively, while the SRF/OFA decreased. Structural equation modeling showed a negative path between CNP level and enzyme activity. The available As and Cd were reduced by 1.53-85.23 % and 1.17-43.72 %. The soil TN and nitrogen stocks have become key environmental variables for predicting the changes in As, Cd, and Zn available content. SRF/OFA increased Cd, Cr, and Zn residual state content in microaggregates, while OFA was more effective in immobilizing As in microaggregates. In macro-aggregates, SRF/OFA transformed As and Zn from the reducible to the residual state while reducing the oxidizable state content of Cr. This inhibited the mobility and transformation of potentially toxic elements in paddy soils, thus minimizing the risk to the environment and human health.

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