Effects of Mineral-Based Potassium Humate on Cadmium Accumulation in Rice (Oryza sativa L.) under Three Levels of Cadmium-Contaminated Alkaline Soils
文献类型： 外文期刊
作者： Li, Shuangshuang 1 ; Huang, Xianmin 2 ; Li, Guangxian 3 ; Zhang, Ke 1 ; Bai, Liyong 1 ; He, Huan 4 ; Chen, Shibao 5 ; Dai, Jiulan 1 ;
作者机构： 1.Shandong Univ, Environm Res Inst, Qingdao 266237, Peoples R China
2.Shandong Gen Stn Agr Environm Protect & Rural Ener, Jinan 250100, Peoples R China
3.Shandong Acad Agr Sci, Jinan 250100, Peoples R China
4.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China
5.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
关键词： mineral-based potassium humate; cadmium; rice; antioxidant enzymes; bioavailability; photosynthetic characteristics
期刊名称：SUSTAINABILITY （ 影响因子：3.9； 五年影响因子：4.0 ）
ISSN：
年卷期： 2023 年 15 卷 3 期
页码：
收录情况： SCI
摘要： Humic acid amendments in the remediation of soils contaminated with heavy metals have received widespread attention. However, the impacts and related mechanisms of mineral-based humate substances on the remediation of alkaline paddy soils with different levels of cadmium (Cd) contamination are still unclear. Pot trials with four mineral-based potassium humate (MBPH) doses (0, 0.25%, 0.5%, 1%, w/w) and three Cd rates (slightly, moderately, and highly, 1, 2, and 4 mg Cd kg(-1)) were conducted to evaluate the effects of MBPH on rice. Results showed that the application of MBPH effectively reduced brown rice Cd concentrations of all Cd rates by 46.82-65.04%, 44.02-59.21%, and 15.84-43.99%, such that Cd in brown rice fell within the safe edible standards in the highly contaminated soils with the 0.5% and 1% MBPH applications. The application of MBPH significantly alleviated Cd toxicity by increasing soil solution pH, dissolved organic carbon (DOC), and potassium (K) and decreasing free Cd and the bioavailability of rhizosphere soil Cd, as reflected by promoting rice plant growth, photosynthesis, F-v/F-m, and antioxidant enzymes activities. Additionally, high dose applications (0.5% and 1%) of MBPH significantly reduced the translocation factor of Cd from flag leaf to brown rice. Furthermore, the application of MBPH enhanced the accumulation of mineral elements (iron, manganese, copper, zinc, potassium) in brown rice. Stepwise regression analysis revealed that soil solution K at maturity stage and soil solution DOC at tillering and filling stages were the most important factors affecting Cd accumulation in brown rice under slightly, moderately, and highly Cd-contaminated soils, respectively. Therefore, MBPH application on slightly and moderately Cd-contaminated alkaline soils contributed to achieving rice grains rich with mineral elements but Cd free and Cd safe in highly Cd-contaminated soil.
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