煤矿区复垦土壤压实时空变异特征

    Spatial-temporal variability of reclamation soil compaction in coal mine region

    • 摘要: 为了揭示煤矿区复垦土壤压实状况的时空变异规律,该文以未塌陷土地为对照,通过实地测定,分析5个复垦年限水平和垂直方面的土壤压实度变异特征。结果表明:复垦土壤表层压实度以复垦1 a(正在复垦)的最大,达到 2050 kPa,随着复垦年限增加逐渐减少,复垦5 a的最小(50 kPa),基本达到未塌陷土地的压实度。表层土壤压实度空间变异最大的是复垦5 a的土地(变异系数为68.40%),其次是未塌陷土地(52.58%),最小的是正在复垦的土地 (22.01%)。从各层的变异情况看,正在复垦的土地各个层次土壤压实度都较大且变异系数较低,其他复垦年限土壤压实度上面3层较小但变异大,至第4层(22.86~30.48 cm)达到较高值,且变异较小,之下压实度基本稳定。

       

      Abstract: In order to reveal the spatial-temporal variation law of reclaimed soil compaction in coal mine area, the reclaimed soil compaction variability from vertical and horizontal aspects of five years was analyzed by the testing on the spot and comparing with normal land. The results showed as follows: the reclamation soil surface compaction was the highest with reaching 2050 kPa in first year, and gradually reduced year by year, was the lowest(50 kPa) in the fifth year, and was almost reached the compaction level of unsubsided land. The order spatial variation of soil surface compaction was in the land reclaimed five years(68.40%), next was unsubsided land(52.58%) and the lowest was the land being reclaimed(22.01%); in terms of the variation, the soil compaction is higher and the variation is lower to each soil layer of being reclaimed land, and the compaction of the first three layer is lower but the variation is higher to other redamed land, to the fourth layer(22.86~30.48 cm) is higher and variation is lower, and the compaction under the forth layer is nearly stable.

       

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