晋南地区主要城市道路绿地的表层土壤性质

Topsoil properties of road greenbelts in the major cities of southern Shanxi Province

为了探究晋南地区各城市道路绿地土壤的性质及肥力现状,判断其是否适合绿化植物生长,在晋南地区4个地级市(临汾、长治、运城和晋城)选取道路绿地样带,测定其表层土壤(0~15 cm)的理化性质,并基于修正的内梅罗指数法进行土壤综合肥力评价.结果表明:(1)晋南地区城市道路绿地土壤质地较为黏重,平均pH值为8.39,全氮含量为0.39 g/kg,土壤碱化,氮素匮乏.(2)土壤孔隙状况良好,无压实退化,有机碳和磷素较为充足.(3)土壤综合肥力指数由大到小为晋城≈长治>运城>临汾,4个城市平均值为1.23,处于中等水平.(4)随着土层深度的增加,黏粒含量和土壤容重增加,碳、氮含量减小.(5)利用偏最小二乘(PLS)回归预测土壤肥力综合指数,所得模型对综合肥力指数的解释力为89%,预测结果可靠.

In order to explore the soil properties and fertility status of urban road greenbelts in southern Shanxi Province and determine whether it is suitable for the growth of greening plants,road greenbelts transects were selected from four prefecture-level cities(Linfen,Changzhi,Yuncheng and Jincheng)in southern Shanxi.The physical and chemical properties of surface soil(0-15 cm)were measured.The modified Nemero index method was used to evaluate the comprehensive fertility of soil.The results showed that:①The soil texture of road greenbelt was heavier than natural soils,with an average pH of 8.39 and a total nitrogen content of 0.39 g/kg.The soil was characterized of alkalization and nitrogen deficiency.②The soil was also characterized of rich porosity,no compaction,moderate levels of organic carbon and phosphorus.③The order of soil comprehensive fertility index from large to small is Jincheng≈Changzhi>Yuncheng>Linfen,and the average value of the four cities was 1.23,which was at the middle level.④With the increase in soil depth,clay content and soil bulk density increased,but carbon and nitrogen content decreased.⑤The partial least squares(PLS)regression was used to predict the comprehensive fertility index.The explanatory power of the models for the comprehensive fertility index was 89%,the prediction results of which were reliable.