Zhang Qiu, Li Zhongwu, Huang Bin, Luo Ninglin, Long Lingzhi, Huang Mei, Zhai Xiuqing, Zeng Guangming
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China.
Key Laboratory of Environment Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
Environ Sci Pollut Res Int. 2017 Jan;24(3):2734-2743. doi: 10.1007/s11356-016-7853-0. Epub 2016 Nov 11.
The influence of land use change from paddy soil to vegetable soil on the adsorption-desorption behavior of Cd in soil aggregates and the variation in soil properties were investigated. The vegetable soil was characterized by lower pH, organic matter content, cation exchange capacity (CEC), free iron oxides, manganese oxides, and catalase activity and higher urease activity compared with the paddy soil. In the isothermal adsorption and desorption experiments, the adsorption characteristics of Cd of the two soils could be well described by Langmuir and Freundlich equations. The adsorption capacity of vegetable soil decreased 22.72 %, and the desorption rate increased 35 % with respect to paddy soil. Therefore, conversion from paddy to vegetable field can reduce the adsorption ability to Cd of the soil to a certain extent. Both the two soils reached the maximum adsorption capacity and the minimum desorption rate in the <0.002-mm faction. The adsorption capacity of Cd in paddy and vegetable soils exhibited great reliance on the content of CEC. Desorption rate was negatively correlated with the four indicators: organic matter, CEC, free iron oxides, and manganese oxides, and specific adsorption was primarily controlled by soil organic matter and manganese oxides.
研究了从水稻土转变为菜园土的土地利用变化对土壤团聚体中镉吸附 - 解吸行为及土壤性质变化的影响。与水稻土相比，菜园土的特点是pH值、有机质含量、阳离子交换量（CEC）、游离铁氧化物、锰氧化物和过氧化氢酶活性较低，脲酶活性较高。在等温吸附和解吸实验中，两种土壤对镉的吸附特性可用Langmuir和Freundlich方程很好地描述。相对于水稻土，菜园土的吸附容量降低了22.72%，解吸率提高了35%。因此，从水田转变为菜地在一定程度上会降低土壤对镉的吸附能力。两种土壤在<0.002-mm粒级中均达到最大吸附容量和最小解吸率。水稻土和菜园土中镉的吸附容量对阳离子交换量的含量表现出很大的依赖性。解吸率与有机质、阳离子交换量、游离铁氧化物和锰氧化物这四个指标呈负相关，特异性吸附主要受土壤有机质和锰氧化物控制。
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