城市道路绿带土壤pH特征分析--以南京市为例

Analysis of soil pH characteristics of urban road green belt--Taking Nanjing as an example

以南京市为例,通过对城市绿地土壤pH的采样调查,重点分析了道路绿带的土壤pH特征及与空间因素和养分元素有效性之间的关联。结果显示,道路绿带pH均值为7.83,与其他绿地存在显著差异且在平均水平上唯一呈碱性;pH与绿带宽度具有显著负相关性,最优拟合曲线为对数模型,拐点在2 m左右;绿带土壤的有效磷和有效钾含量较高,碱解氮含量很低并与pH之间存在显著负相关。城市绿地空间上的变化形成了生境条件的差异,其中的关联规律是绿地营建中自然秩序恢复的基础,为可持续的绿地设计提供依据。

Taking Nanjing as an example,this paper analyzes the pH characteristics of soils in road green belts and analyzes their relationship with spatial factors and the effectiveness of nutrient elements.The results show that,the average pH of the green belt is 7.83,which is the only one that is alkaline at the average level and is significantly different from other green lands;pH and green belt width have a significant negative correlation,the best fit curve is a logarithmic model,the inflection point is about 2 m;the content of available phosphorus and available potassium in the green belt soil is higher,while the content of alkaline nitrogen which has a significant negative correlation with pH is very low.The spatial changes of urban green land have formed differences in plant-habitat conditions.The related laws between them are the basis for the restoration of natural order in the construction of green land,and provide a basis for sustainable green land design.