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Enhancing the estimation of cadmium content in rice leaves by integrating vegetation indices and color indices using machine learning

文献类型： 外文期刊

作者： Huang, Xiaoyun 1 ; Chen, Shengxi 2 ; Fu, Tianling 2 ; Fan, Chengwu 3 ; Chen, Hongxing 2 ; Zhang, Song 2 ; Chen, Hui 2 ; Qin, Song 2 ; Gao, Zhenran 2 ;

作者机构： 1.Guizhou Univ, Ctr Res & Dev Fine Chem, Key Lab Green Pesticide & Agr Bioengn, State Key Lab Breeding Base Green Pesticide & Agr, Guiyang 550025, Peoples R China

2.Guizhou Univ, Inst New Rural Revitalizat, Guiyang 550025, Guizhou, Peoples R China

3.Guizhou Acad Agr Sci, Guizhou Inst Soil & Fertilizer, Guiyang 550025, Peoples R China

关键词： Rice; Cadmium content; Machine learning; Vegetation index

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.1； 五年影响因子：6.4 ）

ISSN： 0147-6513

年卷期： 2025 年 290 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd) is a heavy metal recognized for its notable biotoxicity. Excessive Cd levels can have detrimental effects on crop growth, development, and yield. Real-time, rapid, and nondestructive monitoring of Cd content in leaves (LCd) is essential for food security. Previous research has primarily utilized traditional statistical methods and heavy metal-related vegetation indices (VIs) to develop models for estimating LCd, often resulting in a lack of generalizability. Herein, 252 sets of leaf samples with varying Cd contents were collected under six Cd concentration gradients in hydroponic and soil cultivation conditions. An LCd estimation model was developed by integrating VIs, color indices (CIs), and machine learning (ML) algorithms. Results indicate that VIs and CIs were strongly correlated with LCd, exhibiting correlation coefficients (r) of 0.73 and 0.57, respectively. The ML estimation model, which integrated both indices, was more effective than the single-parameter model developed using traditional statistical methods. Notably, the LCd estimation model developed using the random forest method exhibited the highest accuracy, with a coefficient of determination (R2) of 0.81 and a root-mean-square error of 0.120. These results indicate that multisource index data based on ML algorithms can effectively estimate LCd. This study presents an accurate, reliable, and generalized method to estimate LCd, providing valuable insights for assessing the large-scale heavy metal pollution status of rice using unmanned aerial vehicle remote sensing technology.

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