Screening Of Roof Greening Cultivation Substrate In Guanzhong Area Of Shaanxi

In recent years,with the smog problems in Guanzhong and Xi’an areas intensifying,the air The quality is rapidly declining and the heat island effect is intensifying.How to solve the major environmental problems facing the city has become a problem that needs to be paid attention to in the whole province and even the whole country.For a city,the green space is transferred from the ground to the upper space-roof,which not only saves The land area can also protect the ecology while alleviating the heat island effect,purifying the air,reducing the noise in the city,reducing the PM value in the air,and developing the roof greening is also an important way to beautify the environment,enrich the landscape,and improve the quality of the living environment..In the greening of the roof,planting the substrate is an important factor,and it has an essential relationship with the most important load and drainage of the roof greening.Based on the systematic induction and comprehensive review of the relevant literature,based on the requirements of roof greening,the selection of substrates with light weight,good fertilizer efficiency,strong water retention and suitable for plant growth on the roof is considered as the material.Under the conditions of easy access,the common pastoral soil,decomposed cow dung and charcoal were selected as experimental materials,mixed in different proportions,and compared with the pastoral soil,the pHysicochemical properties of the substrate by the experimental method,water and fertilizer retention capacity(nitrogen,potassium The determination of the growth index(plant height,ground diameter,crown width)of plants by pot experiment,through the comparative analysis of various aspects,the following conclusions were obtained:The maturity of boiled cow dung is 45%,and the matrix of charcoal is 30%.The bulk density and porosity are within the optimum range of roof greening.The water-holding and evaporating ratios of other substrates are also better.Monitor the growth of plants grown in the substrate.The growth index of T10 matrix group is much higher than other groups.It is suggested that the proportion of cow dung and charcoal should be used in the construction of roof greening matrix,that is,the ratio of cow dung and charcoal is 45%: charcoal dung 45%:charcoal 20%(V/V)To promote the application.