Rice rhizospheric effects and mechanism on soil cadmium bioavailability during silicon application

文献类型： 外文期刊

第一作者： Yang, Yi

作者： Yang, Yi;Peng, Hua;Deng, Kai;Wei, Wei;Liu, Saihua;Li, Changjun;Zhu, Jian;Dai, Yanjiao;Song, Min;Ji, Xionghui;Yang, Yi;Peng, Hua;Deng, Kai;Wei, Wei;Liu, Saihua;Li, Changjun;Zhu, Jian;Dai, Yanjiao;Song, Min;Ji, Xionghui;Yang, Yi;Peng, Hua;Deng, Kai;Wei, Wei;Liu, Saihua;Li, Changjun;Zhu, Jian;Dai, Yanjiao;Song, Min;Ji, Xionghui;Shi, Yu

作者机构：

关键词： Silicon; Rice cultivar; Rhizosphere; Cd; Soil properties; Iron plaque

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 930 卷

页码：

收录情况： SCI

摘要： Exogenous Si mitigates the mobility and bioavailability of Cd in the soil, thereby alleviating its phytotoxicity. This study focused on specific Si -induced immobilisation effects within the rhizosphere (S1), near-rhizosphere (S2), and far-rhizosphere (S3) zones. Based on the rhizobox experiment, we found that applying Si significantly elevated soil pH, and the variation amplitudes in the S3 soil exceeded those in the S1 and S2 soils. Siinduced changes in the rhizosphere also included enhanced dissolved organic carbon and diminished soil Eh, particularly in the Si400 treatment. Meanwhile, the introduction of Si greatly enhanced the Fe 2 + and Mn 2 + concentrations in the S1 soil, but reduced them in the S2 soil. The rhizosphere effect of Si which enriched Fe 2 + and Mn 2 + subsequently promoted the formation of Fe and Mn oxides/hydro-oxides near the rice roots. Consequently, the addition of Si significantly reduced the available Cd concentrations in S1, surpassing the reductions in S2 and S3. Moreover, Si -treated rice exhibited increased Fe plaque generation and fixation on soil Cd, resulting in decreased Cd concentrations in rice tissues, accompanied by reduced Cd translocation from roots to shoots and shoots to grains. Structural equation modelling further highlighted that Si is essential in Cd availability in S1 and Fe plaque development, ultimately mitigating Cd accumulation in rice. Si -treated rice also exhibited higher biomass and grain yield than those of control groups. These findings provide valuable insights into Si -based strategies for addressing the Cd contamination of agricultural soils.

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