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THE EVALUATION OF SOIL PRODUCTIVITY IN RECLAMATION DISTRICT FILLING BY COAL GANGUE WITH DIFFERENT THICKNESS OF COVERING SOIL

LIU Hui-Ping,YAN Jia-Ping,FAN Wen(School of Earth and Environmental Science,Anhui University of Science and Technology,Huainan 232001,China)  
Taking Xinzhuangzi mining subsidence area in Huainan Coal Mining Area for example.It is studied the productivity of reclamation soil which is filled by coal gangue with different thickness of covering soil,and found that the productivity of reclamation soil with different covering thickness differ gentle when on the base of filling with coal gangue,in which the production of wheat in plots covered with thicker soil is 5 770 kg/hm2,the thinner block only is 4 736 kg/hm2.Evaluate the productivity of reclamation soil with different soil cover thickness using Modified Index of Reclaimed Soil Productivity(MPI)model.The results show that the adaptive of hydrolyzable nitrogen and available potassium is close to the control plots when the soil thicknesses are 75 cm and 90 cm,while the available phosphorus and organic matter is on the low side in some sort,the levels of their productivity verges on the control block;the nutrients of the plots with 40 cm and 60 cm are generally lower which are limiting the growth of crops.Through the error analysis of evaluation results,it is indicated that the minimum error of this evaluation is 1.65 %,and the maximum error is 4.33 %,the evaluation of gangue reclaimed soil productivity using of MPI model has high accuracy.
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