Silicon fertilizers, humic acid and their impact on physicochemical properties, availability and distribution of heavy metals in soil and soil aggregates

文献类型： 外文期刊

第一作者： Zhao, Keqi

作者： Zhao, Keqi;Yang, Yuan;Zhang, Lihua;Zhou, Yaoyu;Zhang, Jiachao;Lin, Xu;Wang, Nanyi;Huang, Hongli;Luo, Lin;Peng, Hua;Du, Chunyan;Liu, Junwu

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关键词： Silicon fertilizer; Humic acid; Soil aggregate; Heavy metal; Availability

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 822 卷

页码：

收录情况： SCI

摘要： It has been confirmed that silicon (Si) fertilizer and humic acid (HA) could effectively decrease the heavy metals in soil. Nonetheless, the impact of these additives on soil aggregate characteristics was ignored. Therefore, the effects of Si fer-tilizer, HA, and their combinations on the physicochemical characteristics, availability of heavy metals (Cu, Cd, Pb, Zn), and fraction changes in soils and soil aggregates were investigated in this research. The results showed that Si fer-tilizer and HA significantly modified soil properties such as soil pH, electrical conductivity total organic carbon, water-soluble organic carbon, and nitrate-nitrogen. HA and Si-HA (SHA) supplementation significantly decreased the avail-ability of Cu, Cd, Pd, and Zn. Besides, there was no significant difference in physicochemical properties between soil and soil aggregates. The availability of Cu, Cd, Pd, and Zn in soil aggregates could be significantly inhibited by the ad-dition of HA and SHA, and the content in microaggregates was greater than that in macroaggregates. After the addition of the three additives, the main fractions of heavy metals in different particle sizes were changed and eventually trans -formed to the residue state. These results indicated that Si fertilizer, HA, and SHA were influential in physicochemical properties and metal availability in soil aggregates. Therefore, it is of great scientific significance to study the impact of heavy metal pollution on the ecological environment in different aggregates, which will provide reference data for fu-ture sustainable management of heavy-metal polluted soils.

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