中国水土保持科学2025，Vol.23Issue(2)：46-54,9.DOI:10.16843/j.sswc.2024075
冻融循环对露天煤矿排土场土体水分物理性质的影响
Influences of freeze-thaw cycles on the physical properties of soil moisture in open-pit coal mine dumping sites
摘要
Abstract
[Background]In order to reveal the mechanism of the influence of freeze-thaw cycles on the physical properties of soil in the spoil heap of an open-cut coal mine during the spring thawing period,this study selected the soil in different reclamation vegetation types(Ulmus pumila forestland,Rhus typhina forestland,farmland and waste grassland)and different soil depths(0-20,20-40 and 40-60 cm)in the spoil heap of Haizhou open-cut coal mine in Liaoning as the research object.[Methods]In the standard sample plot,three sampling points were selected respectively,and 80 cm soil profile was excavated at each sampling point.At a depth of 0-60 cm,samples were taken at an interval of 20 cm from the soil layer,and 3 samples were taken from each layer.The samples were frozen at-15 ℃ for 12 h and then thawed at 12 ℃.Physical water parameters such as soil bulk density,capillary porosity,non-capillary porosity and soil moisture content before and after freeze-thaw were measured by ring knife method and drying method respectively.Through significance analysis,the effects of freeze-thaw cycle on soil moisture physical properties of different reclaimed vegetation types in the dump were discussed.[Results]1)After freezing and thawing,the average soil bulk density of U.pumila forestland,R.typhina forestland,farmland and waste grassland increased by 0.07,0.06,0.06,and 0.06 g/cm3,respectively.The soil bulk density of the 20-40 cm soil layer in the R.typhina forestland and the 40-60 cm soil layer in the waste grassland were significantly different from that before freezing and thawing(P＜0.05),and the other soil layers of the reclaimed vegetation types were significantly different from that before freezing and thawing(P＜0.01).2)The average soil moisture content of U.pumila forestland,R.typhina forestland,farmland and waste grassland decreased by 1.59％,2.40％,1.81％and 1.74％,respectively,except that the soil moisture content of 20-40 cm soil layer of U.pumila forestland and 0-20 cm soil layer of farmland had a very significant difference compared with that before freezing and thawing(P＜0.01).The soil layers of other reclaimed vegetation types were significantly different from those before freeze-thaw(P＜0.05).3)The average non-capillary porosity decreased by 1.44％,1.99％,1.54％and 1.45％in U.pumila forestland,R.typhina forestland,farmland and waste grassland,except that the non-capillary porosity of 20-40 cm soil layer in U.pumila forestland and 0-20 cm soil layer in farmland were significantly different than that before freeze-thaw(P＜0.01).The soil layers of other reclaimed vegetation types showed significant differences compared with those before freeze-thaw(P＜0.05).4)The average capillary porosity decreased by 3.87％,6.04％,4.44％and 4.38％in U.pumila forestland,R.typhina forestland,farmland and waste grassland,except that the capillary porosity of 20-40 cm soil layer in U.pumila forestland and 0-20 cm soil layer in farmland was significantly different than that before freeze-thaw(P＜0.01).There were significant differences in soil depth of other reclaimed vegetation types compared with that before freeze-thaw(P＜0.05).[Conclusions]Freeze-thaw effect has a certain degree of irreversible damage to soil structure.After freeze-thaw cycle,the bulk soil density of reclaimed vegetation types in 0-60 cm soil layer increases,while the water physical parameters of other soils decrease.This can provide a basis for revealing the mechanism of freeze-thaw effect on soil water physical properties.关键词
露天煤矿/排土场/复垦植被类型/冻融循环/土体水分物理性质Key words
open-pit coal mine/dump/reclaimed vegetation types/freeze-thaw cycle/physical properties of soil moisture分类
矿业与冶金引用本文复制引用
熊姝臻,吕刚..冻融循环对露天煤矿排土场土体水分物理性质的影响[J].中国水土保持科学,2025,23(2):46-54,9.基金项目
辽宁省"兴辽英才计划"项目"辽东水源涵养林区煤矿废弃地生态修复关键技术研究"(XLYC2007046) （XLYC2007046）
