深圳市5类城市绿地土壤渗透性研究

为探明深圳市不同类型绿地土壤渗透性特征,依据CJJ/T85-2017《城市绿地分类标准》,选择G1公园绿地、G2生产绿地、G3防护绿地、G4附属绿地和G5其他绿地进行土壤渗透性测定和定量分析。结果表明:(1)各绿地土壤水分渗透率依次为:生产绿地防护绿地其他绿地公园绿地附属绿地,3项渗透特征值为:初渗率平均渗透率稳渗率,入渗率随着土壤深度增加呈减小趋势;(2)经考氏经验公式对水分入渗模型拟合,各拟合模型的相关系数R2≥0.748 8;(3)对土壤渗透性与主要土壤因子进行相关性分析,发现初渗率、平均渗透率和稳渗率与土壤容重呈极显著负相关,与土壤总孔隙度和非毛管孔隙度呈极显著正相关,平均渗透率与毛管孔隙度呈显著负相关,其余比对虽有相关关系,但均未达到显著水平。

Study on soil permeability of five kinds of urban greenlands in Shenzhen

The soil permeability of 5 types of greenland in Shenzhen was studied according to CJJ/T85-2017 Classification Criterion for urban greenlands.5 different locations were selected as follows:G1 park greenland, G2 production greenland,G3 protective greenland,G4 suburban greenland,and G5 other greenland.The results showed that the order of soil moisture permeability was G2>G3>G5>G1>G4.And the order of 3 penetration eigen values were infiltration rate> average permeability> stable infiltration rate and the infiltration rate de-creases with the increase of soil depth.Moreover,the water infiltration model was fitted to Kostiakov's model and the correlation coefficient R2of each model was ≥0.748 8 in general.Correlation analysis of soil permeabili-ty showed that the main different soil factors such as the initial infiltration rate,average permeability,and stable infiltration rate were significantly negatively correlated with soil bulk density while the fore-mentioned factors were significantly positively correlated to the total soil and non-capillary porosity and the average permeability was significantly negatively correlated with capillary porosity.The rest parameters showed correlation at certain degree,but not significant.