Study On Soil Physical Properties And Water Infiltration Performance Of Urban Park Green Space In Xinxiang City

In recent years,extreme climate events have occurred frequently around the world,and urban rainwater has attracted widespread attention around the world,and it is also an urgent problem to be solved in many cities in my country.Rain and floods lead to serious urban waterlogging,which in turn affects urban traffic,life,production and other activities,and even threatens the safety of urban public life.This study selects the main urban park green spaces in Xinxiang City,Henan Province.For different park green space(People's Park,Muye Park,Harmony Park,Quality Park,Xiangyang Park),different vegetation types(arbor grass,shrub grass,grassland),different compactness green space(loose,relatively compact,compact,too compact,firm),different soil depths(0-15 cm,15-30 cm,30-45cm),Carry out research on soil physical properties and soil infiltration performance.The relationship between the physical properties of green space soil and soil infiltration performance was discussed,in order to provide reference for the construction of rainwater infrastructure and green space management in urban green space in the north,especially in the northern part of Henan Province.The main findings are as follows:(1)Through the research on the soil physical properties of the urban park green space in Xinxiang City,it is found that the soil physical properties of the urban park green space in Xinxiang City are generally poor.The average soil moisture content is 14.11%;the average soil bulk density is 1.56 g/cm3,and 95.51%of the soil bulk density in the urban parks of Xinxiang City is higher than the 1.35 g/cm3 required for green planting soil;the average soil specific gravity is 2.51 g/cm3;the average soil porosity is 37.51%,the porosity suitable for plant growth is 50%,and 98.08% of the soil in Xinxiang city park green space is less than this value;the average soil compaction is 3290.94 k Pa,85.90% of soil compactness exceeds 2000 k Pa;the average value of soil saturated hydraulic conductivity is 19.25 mm/h,51.92% of soil saturated hydraulic conductivity of urban park green space in Xinxiang City belongs to the poor level,37.82% belongs to the extremely poor level,and 9.62% It belongs to a good level,and only 0.64% is larger than 100 mm/h.To sum up,the soil of urban park green space in Xinxiang City is mainly characterized by large soil bulk density,small soil porosity,high soil compactness,low soil specific gravity,and low saturated hydraulic conductivity.(2)Through the correlation analysis of various soil physical properties of urban park green space in Xinxiang City,it is found that the soil moisture content has a very significant negative correlation with soil bulk density and soil compactness(P<0.01),and was extremely significantly positively correlated with soil porosity(P<0.01),soil bulk density was extremely significantly negatively correlated with soil water content,soil specific gravity,and soil porosity(P<0.01),and was extremely significantly positively correlated with compaction(P<0.01).Significant negative correlation(P<0.01),extremely significant positive correlation(P<0.01)with soil porosity and soil compactness(P<0.01),in addition to the significant positive correlation between soil saturated hydraulic conductivity and soil specific gravity(P<0.05),and other the correlation of physical properties was not significant(P>0.05).(3)There are obvious differences in the soils of different parks in Xinxiang City.Among them,the soil moisture content,soil bulk density and soil porosity of Xiangyang Park are better than other parks,and the soil specific gravity,soil compactness and soil saturated hydraulic conductivity are at medium levels.The soil proportion and soil compactness of People's Park are better than other parks,and the soil saturation hydraulic conductivity of Muye Park is better than other parks.(4)The soil physical properties of different vegetation types showed obvious differences.Among them,the soil bulk density,soil specific gravity,soil porosity and soil compactness of the shrub grassland were better than those of the arbor grassland and grassland,and the soil moisture content of the grassland was higher than that of the shrub grassland and arbor grassland,and the soil saturated hydraulic conductivity of arbor grassland is higher than that of grassland and shrub grassland.(5)Through the analysis of the physical properties of green space soils with different compactness grades in urban parks in Xinxiang City,it can be seen that due to the influence of human disturbance,the compaction degree of green space soils is generally high.Among them,the green land soil with compactness accounted for the highest proportion,reaching 31.40%.The more compact soil moisture content is the highest,the soil bulk density is the smallest;the loose soil specific gravity is the smallest;the compact soil porosity is the largest;the firmness soil has the highest saturated hydraulic conductivity.And the deeper the soil layer of urban green space,the higher the soil compactness.