Impacts of Rice–Rape Rotation on Major Soil Quality Indicators of Soil in the Karst Region

Hui Fang, Qiuxiao Yan (), Zhenming Zhang, Daoping Wang and Xianfei Huang
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Hui Fang: Key Laboratory of Chemistry for Natural Products, Guizhou Medical University, Guiyang 550025, China
Qiuxiao Yan: Key Laboratory of Chemistry for Natural Products, Guizhou Medical University, Guiyang 550025, China
Zhenming Zhang: College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
Daoping Wang: Key Laboratory of Chemistry for Natural Products, Guizhou Medical University, Guiyang 550025, China
Xianfei Huang: Guizhou Provincial Key Laboratory for Environment, Guizhou Normal University, Guiyang 550009, China

IJERPH, 2022, vol. 19, issue 19, 1-11

Abstract: Arable land resources in karst regions are relatively scarce. The original crop rotation pattern can no longer meet the requirements of productivity development, while different crop rotation patterns have different impacts on the physicochemical properties of the soil. Through field experiments and laboratory analysis, the physicochemical properties and pollution characteristics of the soil during different crop growing stages in rice–rape rotation were investigated systematically. The main results are as follows. During the rice–rape rotation, fine sand in the topsoil experienced the greatest variation. During the rotation, pH variation in the subsoil was greater than that in the topsoil. The soil in paddy fields was poorly ventilated, and the rotation could reduce the redox potential of the soil. In the rotation process, the soil organic matter in the topsoil was higher than that in the subsoil, but the variation of soil organic matter in the topsoil was lower than that in the subsoil. The worst Cd pollution of the topsoil occurred in the seedling stage of rice, while that of the subsoil occurred in the flowering stage of rape; the comprehensive pollution index of Cr and Cd in the subsoil was higher than that in the topsoil. It is of great significance to investigate efficient crop rotation patterns under the conditions of the current productivity for promoting sustainable increases of rape and rice yield, maintaining soil fertility, and improving the soil.

Keywords: heavy metals in soil; migration and transformation; activity; rice–rape rotation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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