| Urban green space soil is an important ecological barrier to protect the urban environment and plays an important role in improving the urban ecological environment.However,the soil properties of cities have changed significantly.It is mainly reflected in a series of problems such as high p H,nutrient infertility,high bulk density,and poor ventilation performance of urban bare soil in China.China's garden greening waste has the characteristics of large reserves,difficult to absorb,and easy to pollute the environment,which has become one of the problems to be urgently solved in urban construction.This research uses garden waste as raw materials and urea-formaldehyde resin as adhesive to prepare a new type of covering mat product and tests its basic properties.Through field experiments,the physical and chemical properties,microbial community structure,and diversity of soils under different mulching measures were measured.On the one hand,it can reflect soil productivity and soil fertility,on the other hand,grasp the data of soil physical and chemical and bacterial community diversity can also achieve the sustainable use of soil resources.My thesis came to the following conclusion:(1)Organic covering mat made of garden waste: It had strong pressure resistance,water retention and water holding performance.With the same sizing amount,the compressive strength of the organic covering mat after water soaking was significantly lower than that before immersing the water;small size covering mats had better water permeability when the sizing amount was not higher than 30%,and the large size was basically not sizing The water holding capacity increased as the soaking time increased,and the water absorption rate decreased as the soaking time increased;the water holding performance of the small particle size mat was better than that of the large particle size;the water holding property of the small particle size mat was excellent cover the mat with large particles.(2)Covering garden waste,organic covering mats,and bark would help to reduce Soil density and improve soil porosity and other physical indicators to a certain extent,but the impact was not significant;covering treatment was conducive to improvement Soil water holding capacity,saturated water holding capacity,capillary water holding capacity and other indicators;the effect on soil p H was not significant,and long-term coverage observations were needed for further research;the soil nutrient content of the soil under different coverage 0-10 cm was higher than 10-20 cm soil layer.As the soil layer deepens,the nutrient content of the soil layer decreased.Garden waste,organic mulching mats,and bark mulch methods had a significant effect on the nutrient content of surface soil,which can increase the content of soil organic matter and nitrogen,phosphorus,and potassium;organic surface covering materials had a significantly better effect than inorganic surface covering materials,and can improve soil nutrients content.(3)The structure and diversity of soil bacterial communities: The ? diversity of bacterial communities has been effectively improved,and garden waste and wood chips have been treated well;the dominant bacteria that have been obtained at the door level are Proteobacteria and Actinomycetes(Actinobacteria),Chloroflexi.Actinobacteria.Alphaproteobacteria,Gamma proteobacteria are the dominant bacteria at the level of the class;from the ? diversity of soil bacteria,it can be concluded that within the garden waste group.The differences were large,and the differences among wood chip,bark,ceramsite and cobblestone groups were small;the composition of soil bacterial communities was not much different,and each covering method had its own OTU.Organic mulching mats had more preferred bacterial populations than inorganic mulching methods;soil bacterial communities were positively related to soil nutrient,and p H had a negative correlation with soil organic matter content.There was no correlation between organic matter and p H. |
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