Effects of Freeze-thaw Cycles on Brown Soil Aggregates and Cadmium Transformations Within Particle Size Fractions

doi:10.13870/j.cnki.stbcxb.2017.04.047

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Effects of Freeze-thaw Cycles on Brown Soil Aggregates and Cadmium Transformations Within Particle Size Fractions

更新时间：2025-03-12

- Effects of Freeze-thaw Cycles on Brown Soil Aggregates and Cadmium Transformations Within Particle Size Fractions
- Vol. 31, Issue 4, Pages: 298-303(2017)
- 作者机构：
  
  沈阳农业大学土地与环境学院，农业部东北耕地保育重点实验室，土壤肥料资源高效利用国家工程实验室,沈阳,110866
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.04.047
  CLC： X53
- Published：2017
- 稿件说明：
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Effects of Freeze-thaw Cycles on Brown Soil Aggregates and Cadmium Transformations Within Particle Size Fractions[J]. 2017, 31(4): 298-303.
DOI：

Effects of Freeze-thaw Cycles on Brown Soil Aggregates and Cadmium Transformations Within Particle Size Fractions[J]. 2017, 31(4): 298-303. DOI： 10.13870/j.cnki.stbcxb.2017.04.047.

摘要

以重金属Cd为单一污染源的棕壤作为供试土壤，设定-10，-20，-30 ℃三个温度作为冻结温度，10 ℃作为融化温度进行土壤冻融循环试验。通过测定冻融作用后土壤团聚体粒径组成、土壤质量平均直径、团聚体粒径中Cd的质量负载率以及土壤团聚体中Cd的赋存形态，研究冻融作用对棕壤团聚体稳定性及Cd在不同团聚体粒径中分布与赋存形态的影响。结果表明：土壤经过冻融作用后，＞2 mm的团聚体比例显著增加(P＜0.05)，增加范围为38.4%～54.6%，土壤质量平均直径显著增加(P＜0.05)。经过冻融作用后，重金属Cd主要富集在＞2 mm的团聚体粒径中，所占比例为51.2%～57.2%。冻融作用使土壤及不同粒径团聚体中交换态Cd和有机结合态Cd含量显著降低(P＜0.05)，铁锰氧化物结合态Cd和残渣态Cd含量显著增加(P＜0.05)。

Abstract

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

-20 and -30 ℃

respectively

and the thawing condition was implemented under 10 ℃. 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 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%.Cadmium mainly accumulated in particles ＞2 mm

and it contributed 51.2%～57.2% of cadmium to the contents in bulk soil. The exchangeable fraction of cadmium and the organically bound fraction of cadmium significantly decreased (P＜0.05)

and the Fe and Mn oxide bound fraction of cadmium and the residual fraction of cadmium increased significantly (P＜0.05) in bulk soil and particle size fractions for the soil experiencing freeze-thaw cycles. The results suggest that the bioavailability of cadmium decrease in soil experiencing freeze-thaw cycles.

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