治理式休耕对'长株潭'镉污染稻田土壤理化特性及镉含量的影响
摘要
This study aimed to explore the effect of control fallow on cadmium-contaminated paddy fields. Therefore, 29 monitoring points were set up in a cadmium-contaminated paddy area of"Changzhutan"in Hunan Province to explore the effects of normal cultivation(CD), general fallow(CS), and managed fallow(CV) conditions on the physicochemical properties of soil, its nutrient status, and whole and effective state cadmium content. The results showed that the soil effective cadmium content of CV decreased significantly by 20.60% compared with that of CD, but there was no significant difference between CD and CS. CV significantly increased the soil pH value by 0.31 units compared with CD; while the soil exchangeable calcium and magnesium contents were significantly increased by 15.34% and 14.46%. The managed fallow also increased the soil organic matter, effective sulfur, and effective silicon content by 15.45%, 15.28%, and 10.44%, respectively. Correlation analysis showed that there was a significant negative correlation between active state cadmium content in the soil, soil organic matter content, and soil pH. In summary, managed fallow can effectively control cadmium pollution in acidic rice fields and significantly alleviate soil acidification by adjusting soil fertility to achieve the required effect.