Study On Soil Properties And Differences Of Four Green Lands In Yangling Agricultural Hi-tech Industries Demonstration Zone

Urban Green space plays an important role in urban ecological environment.The function of urban green space can not be developed without urban green space soil,the study on soil properties of urban green space has important reference value for evaluating green space quality,selecting suitable tree(grass)species and constructing scientific and reasonable green space vegetation structure.In this study,four types of greenbelt,namely traffic greenbelt,residential greenbelt,subsidiary Greenbelt and Public Greenbelt,were selected as the objects of study in Yangling Agricultural Hi-tech Industries Demonstration Zone,the four types of greenbelt are divided into three types:woodland,grassland and Shrub land and bare land.The effects of soil physical and chemical properties and enzyme activities among different types of green space and different greening ways under the same type of green space on soil physical and chemical properties and enzyme activities were analyzed through field investigation and indoor measurement.The main results are as follows:(1)there are soil compaction problems in the four types of greenbelt soils,the range of soil bulk density is 1.41?1.73 g/cm³,the value of soil bulk density is on the high side,and the range of total porosity is 39.14?47.41%,the total soil porosity of Greenbelt is small,and the field water holding capacity of greenbelt soil varies from 14.78%to 27.75%.The soil of 4types of Yangling Agricultural Hi-tech Industries Demonstration Zone Greenbelt was alkaline,and the range of Ph was 7.96?8.33.(2)the soil physical and chemical properties and enzyme activities of the four types of greenbelt have higher spatial variability,the total porosity coefficient of variability is11.06%,the field capacity coefficient of variability is 14.09%,the sucrase activity coefficient of variability is 27.38%,the Coefficient of variation of soil Catalase activity was11.25%.(3)compared with the soil enzyme activities of the farmland around the Yangling Agricultural Hi-tech Industries Demonstration Zone,the soil enzyme activities of the four types of greenbelt were lower.The average soil urease activity was 0.40 mg NH₃-N·g^-1·24h^-1h-1,the average soil sucrase activity was 0.84 mg/g,and the average soil Catalase activity was 3.91 ml 0.02 ml 0.02 ml KMn O₄·g^-1 20min^-1(4)soil urease activity and soil sucrase activity were significantly affected by different types of green land and different greening patterns,while soil Catalase activity was less affected by different green land types and different greening patterns.(5)compared with bare land,the soil bulk density,soil total porosity,soil field water holding capacity,soil urease activity and soil sucrase activity of forest land were significantly higher,and the improvement of green land soil was obvious,the soil urease activity of grass-irrigated land was significantly higher,the other physical and chemical properties and enzyme activity had no significant difference,grass-irrigated land had limited effect on green land improvement.