祁婺高速公路边坡土壤有机碳变化初探

Preliminary Study on Soil Organic Carbon Change on Qimen-Wuyuan Expressway Slope

为明确高速公路边坡土壤有机碳的变化规律,针对公路边坡生态修复区域土壤有机碳变化规律未知、难以提升土壤碳汇水平、生态修复效果良莠不齐的问题,以江西省祁婺高速公路植被恢复的边坡土壤为研究对象,通过野外边坡土壤调查、实验室理化性质分析,进行了因子分析等数理统计计算。调查了公路沿线不同区域土壤有机碳特征,解析了不同粒径下土壤有机碳的变化特征,识别了有机碳变化过程中土壤质量变化主要影响因素。结果表明:祁婺高速公路边坡生态修复效果好的边坡土壤的有机碳含量较高;祁婺高速公路边坡土壤粒径主要为0.05~0.01 mm粗粉粒,有利于土壤有机碳在自然演化中的富集与保存;土壤肥力是影响祁婺高速公路边坡土壤质量的关键因素,孔隙度和盐渍化为次要因子。本研究为公路边坡土壤有机碳的变化提供参考,呼吁公路交通环保从业人员在公路边坡生态恢复过程中关注土壤有机碳的变化,为未来公路建设绿色、安全、稳定、韧性发展提供解决方案。

In order to make clear change rule of soil organic carbon on expressway slope,in view of the unknown change rule of soil organic carbon in the area of ecological restoration of highway slope,the difficulty in increasing the level of soil carbon sequestration and the mixed effect of ecological restoration,taking the slope soil of vegetation restoration of Qimen-Wuyuan expressway in Jiangxi province as the study object,through the field investigation of slope soil,laboratory analysis of physical and chemical properties,the factor analysis and other mathematical statistics calculation are carried out.The characteristics of soil organic carbon in different areas along the highway are investigated,and the variation characteristics of soil organic carbon under different particle sizes are analyzed.The result shows that(1)the soil organic carbon content is higher on the slope with good ecological restoration effect;(2)the particle size of soil on the slope of Qimen-Wuyuan expressway is mainly 0.05-0.01 mm coarse powder,which are beneficial to the accumulation and conservation of soil organic carbon in natural evolution;(3)soil fertility is the key factor affecting soil quality of slope of Qimen-Wuyuan expressway,porosity and salinization are the secondary factors.The study provides a reference for the changes of soil organic carbon on highway slope,and appeals to the highway traffic environmental protection personnel to pay attention to the changes of soil organic carbon in the process of ecological restoration of highway slope,for the future road construction green,safe,stable,resilient development to provide solutions.