Study Of Reclamation Soil On Physical And Chemical Properties In The Southern Opencast Mine Of Huolinhe In Inner Mongolia

The opencaste mine of Huolinhe is a large state-owened coal enterprise, whose history of mining is more then 30 years.it has made an important contribution for the national and local economic development. From the 90’s of the twentieth Century, it has started to do the work of land reclamation of mining area, and achieved remarkable results. The paper took the reclamation areas in different periods and sites of Huolinhe opencast coal mine as the research object, Through analyzing in the laboratory, field investigating and spot sampling, The reclamation soil on soil physical and chemical properties were studied, the major conclusions of study are as follows:(1)Compared with the control area, in the dumping site flats, the contents of bulk density, sand, pH and available potassium were obviously increased, and the contents of clay, organic matter, available phosphorus and available nitrogen were decreased significantly. In the dump slope, the contents of the sand, pH, and available potassium were increased, and the content of clay, organic matter, available phosphorus and available nitrogen were decreased, but the contents of bulk density had not changed significantly. In the vertical direction of the section, with the increasing of soil depth, the contents of organic matter, available nitrogen, available phosphorus and sand showed a gradually decreasing tendency, and the contents of bulk density, PH, available potassium and soil clay is on the upward trend.(2)With the increasing of reclamation years, the contents of soil bulk density, pH, available potassium and sand were decreased gradually, and the contents of available nitrogen, organic matter and available phosphorus were increased gradually. It showed that mine reclamation work has achieved initial success, the soil began to maturate, the soil quality has improved.(3)In the period of 1-3 years of reclamation, in the surface soil, the contents of available nitrogen, organic matter, available phosphorus and clay grew obviously, and a lager decline in the contents of pH, bulk density, available potassium and sand was appearing. In the period of 3-10 years of reclamation, in the surface soil, the contents of available nitrogen, available phosphorus, organic matter and clay grew at a slow pace, and the decline of the contents of bulk density, available potassium, sand and PH was not obvious. The results showed that at the early stage of of reclamation, the indexes of main physical and chemical properties of soil were changed bigger. This showed that the reclamation effect was significant. But with the increasing of soil reclamation time, the indexes of main physical and chemical properties of soil tended to relax. the indexes still had a large gap with the control area in 10 years of land reclamation.