岩石边坡植被恢复初期土壤养分特征及其影响因素

以北京—承德(简称京承)高速公路(3期)边坡3 a恢复期植被为研究对象,对土壤养分状况进行了调研,并分析了影响养分变化的主要因素.结果表明,pH值绝大部分在6.5左右,86.73％边坡的有机质含量和88.78％边坡的全氮含量都处于中上水平,90.82％边坡的速效磷含量处于较丰富水平,73.74％边坡的速效钾含量处于中下水平,表明在目前施工技术及养护条件下,速效钾成为植物生长的关键养分因子.影响因素中,坡质、坡向和施工工艺对基质养分含量影响较大.

Soil Nutrient Characteristics and Their Influence Factors in Vegetation Restoration on Rocky Slope

Regarding the vegetation recovered for 3years on Beijing-Chengde third-phase freeway slopes as the study object,we conducted an investigation of soil nutrient status and analyzed the main factors affecting soil nutrients.Results showed that soil pH values were mostly about 6.5;soil organic matter contents on 86.73% of the slopes and total nitrogen contents on 88.78% of the slopes,in upper level;available phosphorus contents on 90.82% of the slopes,in rich level;and available potassium contents on 73.74% of the slopes,in low-middle level.This indicated that available phosphorus was the key nutrient factor for plant growth undere the current construction techniques and curing conditions.Slope material,slope direction and construction techniques had more effects on total nutrient content on the slopes.