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《Journal of Soil and Water Conservation》 2017-04
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Effects of Freeze-thaw Cycles on Brown Soil Aggregates and Cadmium Transformations Within Particle Size Fractions

WANG Menglu;WANG Feng;XU Kun;DONG Xu;CONG Yuanxin;YU Na;ZHANG Yulong;DANG Xiuli;College of Land and Environment Shenyang Agricultural University,Ministry of Agriculture of Key Laboratory of Cultivated Land Conservation in Northeast China,National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources;  
Aggregate stability,cadmium distribution and transformation in bulk samples,and particle size fractions were studied of brown soil through freeze-thaw cycle method.The freezing conditions were implemented under-10,-20and-30℃,respectively,and the thawing condition was implemented under10 ℃.Soil aggregate particle size,soil mean mass diameter,grain size fraction cadmium loading,and the cadmium transformations in bulk soil and particle size fractions were measured.The results showed that:(1)Both the fraction of particles 2 mm and soil mean mass diameter increased significantly when soil experiencing freeze-thaw cycles,and the formerranged 38.4%~54.6%.(2)Cadmium mainly accumulated in particles2 mm,and it contributed 51.2% ~57.2% of cadmium to the contents in bulk soil.(3)The exchangeable fraction of cadmium and the organically bound fraction of cadmium significantly decreased(P0.05),and the Fe and Mn oxide bound fraction of cadmium and the residual fraction of cadmium increased significantly(P0.05)in bulk soil and particle size fractions for the soil experiencing freeze-thaw cycles.
【Fund】: 国家自然科学基金项目(41301530);; 农业部东北耕地保育重点实验室开放基金项目;农业部环境保护科研监测所开放基金项目
【CateGory Index】: S152;S153.6
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