Effects Of Three Maturation Methods On The Physical And Chemical Properties Of Coal Gangue Mountain Reconstructed New Soil

Vegetation restoratio n is an important measure for ecological construction in mining areas.The low quality of the new soil is one of the key factors restricting the re storation of plants.The construction of high-quality new soil is of great sign ificance to speed up the proce ss of vegetatio n restoration in co al mining areas.In order to explore the effect on physical and chemical properties of coal gangue mountain reconstructed new soil,the fly ash,coal gangue and raw soil were selected to build new soil.The coal gangue and raw soil were mixed into a coal gangue matrix,according to a 1:1 ratio.The fly ash was added into the coal gang ue matrix in the proportions of 0,10%,20%,30%,40%and50%to reconstruc t new soil b y compounding.Potting culture method was used to culture the reconstructed new soil by irrigating water,wood vinegar and planting vegetation.The moisture,nutrient and salting characte ristics of the reconstructed new soil,and the biomass,strain height,and nutrient content of plants under different fly ash addition ratios were studied.The research results showed that:（1）The higher the proportion of fly ash in the reconstructed new soil,the higher the total n itrogen,pho sphorus and potas sium content of plants,the greater the biomass of plants and the greater the growth height of the tall fescue.When the amount of fly ash added was 50%,the effect was the most significa nt.（2）Under the three maturation methods,there are certain differences in the physical properties of each treatment.When the amoun t of fly ash was added to 40%and 50%,the parameter a characterizing the soil water holding capacity in the Gardner model fitting of irrigating wood vinegar is larger than that of t he other two treatments,and the water holding capacity of th e reconstructed new soil was improved by irrigating wood vinegar.The available water content of the reconstructed new soil was increased with the increase of the p roportion of fly ash.When the p roportion of fly ash was 50%,the available water content of the reconstru cted new soil was max,but there was no significant difference compared with the treatment of adding 40%fly ash.The results of principal component a nalysis showed that the physical charac teristics of the reconstructed new soil were improved best b y planting vegetation when 50%fly ash was added into the reconstructed new soil.（3）Reconstructed new soil p H was not re duced significantly by irrigating wood vinegar for reconstructed new soil.In the treatment of irrigating water and planting vegetation soil p H was reduced when fly ash was added into the reconstructed new soil.The results of two-way ANOVA analysis showed that a mong the three maturation methods,the total organic carbon,active organic carbon,dissolved organic carbo n and dissolved total nitrogen and available phosphorus content of the reconstructed new soil were significantly increased by watering wood vinegar compared with watering an d planting vegetation.The results of principal c omponent analysis showed that whe n the proportion of fly ash added was 50%,the nutrient characterist ics of reconstructed new soil was significantly improved.（4）Two-way ANOVA analysis results showed that amon g the th ree maturation methods,the electrical con ductivity（EC）value,the conten ts of Ca²⁺,Mg²⁺,HCO₃^-,Cl^-and SO₄^2-of reconstructed new s oil were significantly increased by irrigating wood vinegar compared with watering and plan ting vegetation.When the proportion of fly ash was 50%,the EC value,the con tents of K⁺,HCO₃^-,Cl^-and SO₄^2-of reconstructed new soil were significantly increased compared with other addition proportions,whereas the content of Na⁺was reduced.The results of principal component analysis showed that irrigating wood vinegar increased the dissolution ions of the reconstructed new soil.In summar y,when 50%fly ash was added to the coal gangue matrix to reconstruct new soil,reconstructed new soil was matured quickly by irrigating wood vinegar,the water holding and water suppl y capac ity of the reconstructed new soil was significantly improved,the contents of active organic carbon,dissolved organic carbon and dissolved total nitrogen,total phosphorus,avail able phosphorus and avail able potassium in the reconstructed new soil was significantly increa sed.The results of the study can provide data support and theoretical reference for selecting appropriate maturation methods to promote the quality improvement of coal gangue moun tain reconstructed new soil.