成都西部不同交通环线区域绿地土壤肥力特征比较研究

Soil Fertility Characteristics of Urban Green Space Among Different Ring Road Districts in West Chengdu

以成都市不同交通环线绿地土壤为研究对象,通过对p H、有机质、N、P、K、Fe等10项指标的比较研究,探讨成都市不同环线绿地土壤的肥力特征,为城市绿地的管理与可持续利用提供依据。结果表明:成都市绿地土壤呈碱性化趋势;全氮、碱解氮和有效铁水平较低,植物易缺;有机质、全磷和有效磷呈累积趋势,速效钾也表现出有效性提高的特征,而全钾和全铁有被外来低含量物质稀释的特征。各肥力指标在不同交通环线区域的分布特征差异明显,土壤p H表现出从一环路到绕城高速路逐渐升高的趋势,全钾有从一环路内到三环路逐渐升高的趋势,而土壤全磷、有效磷和速效钾从一环路内到绕城均呈逐渐降低的趋势,碱解氮含量表现出从一环路到绕城高速路逐渐降低的趋势;其他指标无明显规律。土壤综合肥力依次为一环到二环区域>一环内区域>三环到绕城区域>二环到三环>绕城以外。

In order to provide the basis for the management and sustainable utilization of urban green space, urban green space soils between different ring roads in Chengdu city were taken as the study object, and the soil fertility characteristics was discussed based on the comparative study of l0 indicators including soil pH value, soil organic matter, N, P, K, Fe, etc. The results showed that these soils had alkaline trend. The total content of nitrogen （TN）, the content of alkaline hydrolyzed nitrogen （AN） and the content of available iron （AFe） were mainly at a low levels, susceptible for plant. There was accumulation trend on soil organic matter （SOM）, total phosphorus （TP） and available phosphorus （AP）, and the content of available potassium （AK） increased. However, the total potassium （TK） and total iron （TFe） showed the dilution characteristics by foreign matter with low content. There were obvious differences in the distribution characteristics of soil fertility indexes among different ring road districts. The soil pH value gradually increased from inner the first ring road to the beltway, and TK gradually increased from inner the first ring road to the third ring road, however, the TP, AP and AK all gradually decreased from inner the first ring road to the beltway, the AK showed gradually decreased from the first ring road to the beltway. Other indexes didn＇t show such obvious rules. The comprehensive soil fertility of urban green space among different ring road districts was as follows： from the first ring road to the second ring road 〉 inner the first ring road 〉 from the third ring road to the beltway 〉 from the second ring road to the third ring road 〉 outer the beltway.