Evaluation of Soil Fertility Restoration Ability in Hequ Open Pit Coal Mine Dump based on Nemerow Index Method
To propose a more reasonable soil improvement plan,the Nemerow index method was used to evaluate the soil fertility of the Hequ open-pit coal mine dumping site.Through literature review and expert scoring,five indicators of soil pH value,organic matter content,alkaline nitrogen content,available potassium content,and available phosphorus content were determined.Combined with the nutrient standards of the 2nd National Soil Census,soil quality evaluation was divided into four levels to quantitatively analyze the organic matter and other indicators of soil fertility in open-pit coal mine waste disposal sites.The results showed that the soil fertility quality indices of the first,second,and third waste disposal sites were 1.107,1.054,and 0.705,respectively.The soil fertility quality indices of the upper and middle lower areas of the fourth waste disposal site were 0.630 and 1.086,indicating significant differences in soil fertility quality among different regions.The soil fertility index in the upper area of the fourth dumping site with the shortest reclamation period is the smallest,indicating that the reclamation period is closely related to the restoration of soil fertility.The coefficient of variation of alkaline nitrogen is the highest,at 28.9％,followed by the coefficient of variation of organic matter,at 22.2％,indicating that the variability of soil capacity indicators in the dumping ground is generally strong.It is clear that the main obstacles to soil fertility are organic matter and alkaline nitrogen indicators,providing targeted management ideas for soil improvement in the later stage of the Hequ open-pit coal mine dumping ground.
万方数据
维普
