Abstract: According to the sampling research of soil for the green-land of 12 urban roads in Guangzhou by using principal component analysis, the soil fertility characteristics were studied and the dominant factors were screened. The results showed that the soil pH value was 5.52-8.76, in which the ratio of alkaline soil to strong alkaline soil was 78.26%; the EC value and the average value of organic matter were 0.19 mS/cm and 26.52 g/kg, respectively, which led to low water soluble salt and organic nutrient; in addition, available P was at a high level, and next levels were total N and total K, while total P, available N and available K were at low levels. The screening results showed that, the soil pH, organic matter, total N, total P, available N and available P could be selected as target on evaluating soil fertility as main factors, meanwhile, the soil total K and available K could be selected as target on evaluating soil fertility as secondary factor. Eventually, these research results provided a basis for the construction management and post maintenance of urban road green-land.

Key words: soil fertility, road green-land, landscape engineering, Guangzhou

摘要： 通过对广州市12条道路绿地土壤进行采样调查，结合主成分分析法，研究广州市道路绿地土壤肥力特征及筛选出主导因子。结果表明，广州市道路绿地土壤pH值为5.52～8.76，碱性和强碱性土壤比例为78.26%；EC值和有机质平均值分别为0.19 mS/cm和26.52 g/kg；有效磷含量很高，全氮和全钾含量较高，全磷、碱解氮和速效钾含量较低。筛选结果显示，广州市道路绿地土壤pH值、有机质、全氮、全磷、碱解氮和有效磷可作为土壤肥力评价的主要因子，全钾和速效钾为次要因子。

关键词: 土壤肥力, 道路绿地, 园林工程, 广州