Mining Subsidence Affected to Soil Volume Weight and Water Infiltration Law of Different Vegetation Type

In order to study the mining subsidence affected to the soil water resources,according to the three major vegetation types(salix psammophila,artemisia s ongarica schrenk、poplar )in Shendong Bulianta Mine,with the field investigation,site tests and indoor tests,the variation law of the soil volume-weight before coal minin g,during mining and after mining as well as during the stable period and water infiltration features of the different vegetation type during the stable period were studied. The results showed with the mining operation forward,the difference of the soil volume-weight between the different soil layers would be reduced and the bedding phen omenon of the soil volume-weight would be weakened.Under the different vegetation covered condition,the soil volume-weight would have a certain difference in the diff erent period.During mining,the volume-weight of the three different vegetation type surface soils would be reduced in average.During the stable period,the average soil volume-weight of the land with salix psammophila and artemisia songarica schrenk with deep of 0100 cm would be increased and the average soil volume-weight of the land with poplar would be decreased.Under the different vegetation covered condition,the stable infiltration rate after mining from high to low would be poplar,salix psam mophila,artemisia songarica schrenk and would have a certain relative with volume-weight.