Study On The Preparation Of Organic Covering Mat With Two Kinds Of Adhesives And Its Mulch Effect In Tree Burrow

In the process of urbanization in China,the area of urban green space is increasing gradually,but the soil quality and dust problem caused by bare soil are becoming more and more serious.At the same time a large number of waste garden greening produced in the city every year to solve the problem of waste disposal.In order to alleviate these two problems,predecessors innovatively combined garden greening waste with adhesive to prepare organic covering mat,which were difficult to be popularized due to the toxicity or high cost.Therefore,this study used landscaping waste mixed with waterborne polyurethane and starch adhesive to prepare organic covering mat,studied its various properties,screened out the best proportion and sizing amount,and applied it in the tree hole to explore its improvement effect on soil physical and chemical properties.The main conclusions are as follows:(1)The properties of the organic covering mat were optimized when the size was 30%.The ratio of water-borne polyurethane adhesive to starch adhesive was 8:2.The water-absorbing thickness expansion rate of the organic covering mat was kept at a high level and its water-holding capacity was also higher than that of other treatments.The water retaining effect of the organic covering mat prepared with a single aqueous polyurethane adhesive is less than that of the organic covering mat prepared with mixed adhesive.The permeability of the organic covering mat was similar under different treatments.Similarly,the leachate of four kinds of organic cover mat prepared with adhesive did not have any inhibitory effect on the germination of ryegrass seeds.(2)Different mulching treatments had no significant changes in soil bulk density,water holding capacity and porosity after one year of laying,and did not affect the change of soil pH,but had significant effects in terms of chemical properties.Compared with no covering,covering organic materials can increase the content of soil organic matter and available nutrient nitrogen,phosphorus and potassium,and the effect of one year is better than that of half a year.However,with the deepening of soil depth,the effect of covering on soil properties decreases.Among all the mulches,the soil quality under the organic covering mat prepared by water-based polyurethane adhesive and starch adhesive 8:2 was the best.