Study on Soil Barrier Levels and Barrier Factors in the Ecological Reconstruction Area of Pingshuo Mining District
[Objective]To study the barrier factors of soil obstacles in the ecological reconstruction area of Pingshuo mining area.[Method]The vegetation decline area of Pingshuo open-pit coal mine dump was taken as the research object,and the soil particle composition character-istics,soil nutrient status and soil moisture conditions in the vegetation decline area of the dump were systematically studied through the inves-tigation and soil sampling analysis of typical Robinia pseudoacacia and elm plantations,so as to clarify the vegetation decline mechanism under the influence of soil conditions.[Result]The soil total nitrogen content in Pingshuo open-pit mine dump was generally less than 0.52 g/kg,the average soil total phosphorus content was less than 0.44 g/kg,and the average soil total potassium content was 16.95 g/kg,the total nitrogen and total phosphorus were both very low and low,and the soil total potassium content was medium to low,and there were serious nitrogen and phosphorus stress and moderate potassium stress.The source of the surface soil of the dumping site of Pingshuo open-pit coal mine was the loess and red clay stripped in the process of coal mining.The surface cover soil of the Pingshuo open-pit coal mine waste dump comes from loess and red clay stripped during coal mining.The soil particle composition was uniform,mainly consisting of silt particles(0.005-0.050 mm)and clay particles(＞0.250 mm).The sum of silt particles and clay particles in the 0-40 cm soil layer accounted for more than 95%.Due to the com-paction and natural settlement of large machinery,the soil in the waste dump was severely compacted and had a high bulk density;the overall soil moisture was below the wilting coefficient(12%-20%).[Conclusion]The lack of soil nitrogen and phosphorus nutrients affects plant growth,while the lack of phosphorus and potassium affects plant growth and reduces plant resistance(drought resistance,cold resistance).Lo-ess and red clay soils are compact and dense,with a large capacity and low water infiltration rate.In dry years,there is no effective rainfall during the growth period,and the soil water infiltration supply is extremely poor.Extreme drought causes Robinia pseudoacacia,elm trees,and seabuckthorn to gradually wither and die.
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