Evaluation Of Soil Quality In Coal Mine Reclamation Area

As an important coal industry base in my country,Ordos provides a large amount of coal resources for my country's economic and social development.Due to the large-scale exploitation of coal resources,a large number of coal mine wastelands have been generated.At the same time,coal mining has caused a significant impact on the mining area and its surrounding ecological environment,causing the loss of surface vegetation,exacerbating soil erosion,and significantly reducing soil fertility,resulting in poor soil quality in abandoned coal mines.Vegetation restoration is considered to be one of the most direct and effective ways to improve the ecological environment of the abandoned area of the mining area,and the improvement of soil quality in the reclaimed area is also a key indicator of successful land reclamation in the mining area.In this study,the Chinese seabuckthorn,big fruit seabuckthorn and artificial grassland(control)of different forest ages in the coal mine reclamation area of Ordos City were used as the research objects.The principal component analysis method was used to select the minimum data set,and the seabuckthorn plantation soil quality evaluation system was established.The modified Nemero index method evaluated the soil quality of Hippophae rhamnoides and control plots.This study aims to clarify the improvement effect of seabuckthorn artificial on the soil of coal mine reclamation area,in order to provide data support and theoretical basis for the construction of seabuckthorn plantation in coal mine reclamation area and ecological restoration and reconstruction of reclamation area.The main conclusions are as follows:(1)With the increase of Hippophae rhamnoides forest age,the soil clay and silt have increased,and the sand has decreased,and there are obvious differences between different soil layers.Chinese seabuckthorn is in the 0~20 cm and 80~100 cm soil layers.There are significant differences in soil moisture.In the 20-40 cm and 40-60 cm soil layers,there are significant differences in soil moisture,soil bulk density,saturated water content,capillary water holding capacity,and total porosity.In the 60-80 cm soil layer,There are significant differences in soil moisture,soil bulk density,and total porosity;the l Hippophae rhamnoides is in the 0-20 cm soil layer,and there are significant differences in soil moisture,soil bulk density,saturated water content,capillary water holding capacity,and total porosity,ranging from 20 to There are significant differences in soil moisture,saturated water content,capillary water holding capacity,and total porosity in 40 cm,40~60 cm soil layers.In 60~80 cm soil layer,soil moisture,soil bulk density,capillary water holding capacity,total porosity There are significant differences.In the 80~100 cm soil layer,there are significant differences in soil moisture,saturated water content,capillary water holding capacity,and total porosity.Other physical indicators do not differ significantly between soil layers of different forest ages.(2)There is no significant difference in p H between 0~20 cm,40~60 cm,and 80~100 cm soil layers,and there is no significant difference in alkaline nitrogen in 20~40 cm,40~60 cm soil layers.Differences,other chemical indicators are significantly different among soil layers of different forest ages;there is no significant difference in the 80-100 cm soil layer of H.rhamnoides except for alkaline nitrogen,and other chemical indicators are significantly different among soil layers of different forest ages.(3)The correlation analysis of the 15 indicators of soil physics and chemistry shows that there are many pairs of correlations that are significant or extremely significant.Therefore,these 15 soil fertility quality factors can be used as the main component of correlation extraction.The minimum data set method based on the principal component analysis method was used to screen 15 soil fertility quality evaluation indicators.Finally,7 indicators were included in the MDS,which were powder,sand,saturated water content,p H,conductivity,Total phosphorus and alkaline nitrogen.(4)The score of soil fertility quality evaluation based on the modified Nemero index is: 6-year-old Chinese seabuckthorn woodland soil fertility is the best,7-year-old Chinese seabuckthorn woodland soil fertility is second,and artificial grassland soil fertility is the worst.