五阳矿区采煤塌陷地混推和剥离复垦比较研究

Reclaimed comparison of mixed pushing with topsoil stripping of mining subsided land at Wuyang mining area

在潞安矿业集团五阳矿区采煤塌陷地上,按照混推和剥离2种复垦技术,分复垦种植1,3和5a进行采样,对不同复垦技术及时间条件下土壤养分和重金属元素含量以及物理性质进行采样分析研究.结果表明:①剥离复垦耕地的土壤肥力基本保持不变,耕层养分高于底层,并呈逐年上升的趋势;②混推复垦耕地的土壤肥力低且不匀,必须采取措施尽快提高地力;③土壤重金属元素含量的变化主要受矿区粉尘和污水的影响,与土地复垦的技术和年限关系不大;④平川地区采煤塌陷地的复垦采用剥离复垦的效果较好.

According to two kinds of reclaimed techniques, topsoil stripping and mixed pushing, soils was sampled by the first year, third year and fifth year after growing on subsided land resulting from coalmine at Wuyang mining in Lu'an Mining Bureau. Soil properties were analyzed. The results indicate: ① Using topsoil stripping, soil fertility is nearly the same as original soil, soil nutrients are higher in the topsoil than the bottom soil, and there is an upward tendency.② Using mixed pushing, soil fertility is low and heterogeneous, thus must take measures to improve its fertility quickly.③ Changes of soil heavy metal's content is mostly affected by dust and sewage from mining area and has little connection with the reclaimed techniques and fixed number of years. ④ Returns on reclamation are better by topsoil stripping than mixed pushing in the plains.