闽西丘陵区土壤理化性质对塔基水土流失斑植被恢复的影响

The Influence of Soil Physical and Chemical Properties on Revegetation of Soil and Water Loss Spots of Electric Tower Base in the Hilly Areas of Western Fujian

明确塔基土壤理化性质对地表植被恢复的影响对山区输变电工程水土流失的有效治理具有重要的意义。以福建三明丘陵区不同植被覆盖度的塔基水土流失斑为研究对象,通过植被覆盖与土壤理化性质的对比研究,探讨影响塔基水土流失斑植被恢复的主要土壤特性。结果表明:塔基土壤中的速效磷含量、速效钾元素含量、pH以及物理性黏粒含量与植被覆盖度之间不存在显著的线性相关关系,因而不是影响塔基水土流失斑植被恢复的主要因素。塔基土壤的有机质与植被覆盖度间存在显著的正相关关系,并且代表本底状况下层土的有机质含量与植被覆盖度的相关系数更高,表明塔基土壤的有机质主要不是来源于上覆植被。土壤有机质含量是塔基区水土流失斑植被恢复起始阶段的关键影响因素,而植被恢复程度的增加又会逐渐增加土壤的有机质含量,形成良性循环。

In hilly areas,it is of great significance to clarify the the impact of soil physical and chemical properties of tower base on the surface revegetation for the effective management of soil and water loss in power transmission and transformation projects.Taking soil and water loss spots of tower base with different vegetation coverage in Sanming hilly area as the research object,the main soil characteristics that affect the vegetation restoration of soil and water loss spots of tower base are explored through a comparative study of vegetation coverage and soil physical and chemical properties.The results show that there is no obvious linear correlation between the content of available phosphorus,available potassium,pH value and physical clay content in the soil of tower base and the vegetation coverage,so they are not the main infulencing factors of the revegetation of soil and water loss spots in the tower base.However,there is a significant positive correlation between the organic matter in the soil of the tower base and the vegetation coverage,and the correlation coefficient between the organic matter content in the subsoil and the vegetation coverage is even higher,which indicates that the organic matter in the tower base soil is not mainly from the upper vegetation.Therefore,the soil organic matter content is the key influencing factor in the initial stage of revegetation of soil and water loss spots of electric tower base,and the increase in vegetation restoration will further increase the content of soil organic matter gradually,forming a virtuous circle.