煤矿矿区不同采煤塌陷年限土壤物理性质对比研究

为揭示采煤塌陷对矿区土壤物理性质的影响机理,为矿区生态修复和重建提供理论依据,在选取典型样地的基础上,采用土壤测定方法,研究了不同塌陷年限不同土层土壤物理性质的变化。结果表明:随采煤塌陷年限的延长,矿区表层土壤密度逐渐增大,底层土壤密度先增大后减小;毛管孔隙度逐渐下降,非毛管孔隙度先下降后上升;表层土壤总孔隙度逐渐下降,底层土壤总孔隙度先下降后上升;土壤体积含水量和土壤贮水量先上升后下降,土壤质量含水量逐渐下降;表层土壤毛管持水量逐渐降低,底层土壤毛管持水量先下降后上升;表层土壤田间持水量逐渐降低,底层土壤田间持水量先下降后上升;土壤排水能力先下降后上升。

Comparison Study of Mining Subsidence Years on Soil Physical Properties of in Mining Area

In order to reveal the mechanism of how subsidence put influence on the physical properties of soil in mining area and provide the theoretical basis for the ecological restoration and reconstruction of those areas,the physical changes of typical soil sample plots from different subsidence time and soil layers were studied.The results showed: the soil density gradually increased in surface layers but it increased and then decreased in the bottom layers with the extension of mining subsidence,while capillary porosity gradually increased and non-capillary porosity decreased first and then increased;the total porosity gradually decreased in surface soil,but firstly it decreased then increased in the bottom,while the volumetric content and storage capacity of water increased and then decreased as the mass content just gradually decreased;it gradually decreased in surface soil while it firstly decreased and then increased in the bottom in terms of the moisture capacity;on the surface,the field water-holding capacity gradually decreased and it firstly decreased and then increased in the bottom,while soil discharge ability firstly decreased and then increased.