不同覆土厚度的煤矸石充填复垦区土壤生产力评价

以淮南矿区新庄孜煤矿采煤塌陷区土地复垦区为研究对象,调查了不同覆土厚度的煤矸石充填复垦区土壤生产力状况,发现在以煤矸石充填为基底,上覆不同表土厚度的区域土壤生产能力差异较大,其中覆土较厚的地块小麦产量达到5 770 kg/hm2,覆土较薄的地块只有4 736 kg/hm2。运用了复垦土壤生产力指数的修正模型（MPI）对不同覆土厚度的复垦地块生产力进行评价。结果表明,覆土75 cm和90 cm的地块的水解性氮和速效钾的适应性接近于对照地块,速效磷和有机质的适应性稍微偏低,生产力水平接近于对照地块;覆土40 cm和60 cm的地块土壤的养分普遍偏低,限制了农作物的生长;通过对评价结果的误差分析显示,本次评价的最小误差为1.65%,最大误差为4.33%,运用MPI模型对煤矸石复垦土壤生产力的评价具有较高的精确度。

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

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.