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Predicting Cd accumulation in rice and identifying nonlinear effects of soil nutrient elements based on machine

Aoxue Li¹, Linglan Kong¹, Chi Peng¹

¹Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China.

The Science of the Total Environment

|November 26, 2023

Summary

Soil nutrient elements significantly impact cadmium (Cd) accumulation in rice grains. Understanding these relationships is crucial for managing Cd contamination in paddy soils and ensuring food safety.

Keywords:

Cadmium Nutrient elements Oryza sativa L.Paddy soil Random Forest prediction Translocation factor

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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements

Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements

Published on: July 13, 2016

Area of Science:

Environmental Science
Agricultural Science
Soil Science

Background:

Cadmium (Cd) contamination in paddy soils poses risks to rice production and food safety.
Spatial variability in soil properties complicates effective environmental management of Cd in rice.

Purpose of the Study:

To investigate how soil properties and nutrient elements influence Cd accumulation in rice grains.
To analyze the relationships between soil Cd, nutrient levels, and plant uptake factor (PUF_Cd).

Main Methods:

Paired field sampling in the Xiangjiang River basin.
Analysis of soil properties, total and available Cd, and nutrient elements (Mg, Mn, Ca, P, Si, B).
Statistical analysis including linear correlation, decision tree analysis, and random forest modeling.

Main Results:

Significant spatial variability in soil Cd content and PUF_Cd was observed.
Soil pH, Cd levels, and several nutrient elements (Mg, Mn, Ca, P, Si, B) correlated with grain Cd content (Cd_g) and PUF_Cd.
Nonlinear effects of Si, Zn, and Fe on Cd accumulation were identified, with low Si and high Zn/Fe leading to increased Cd_g and PUF_Cd.

Conclusions:

Soil nutrient elements play a critical role in regulating Cd uptake and accumulation in rice.
Random forest models effectively predicted Cd_g and PUF_Cd, highlighting the importance of soil nutrient management for mitigating Cd in rice.