喀斯特地区退耕还林下不同植被恢复阶段土壤渗透性研究

Different Vegetation Restoration Stages Soil Permeability Study in Karst Area Which Returning Farmland to Forest

为了研究喀斯特地区退耕还林过程中不同植被恢复阶段土壤的渗透特征,选取喀斯特地区蚂蝗田小流域退耕还林后的5种不同植被恢复阶段样地,以天然林地、天然裸地、玉米地作为对照,研究喀斯特地区植被恢复过程中不同层次土壤的渗透性能的变化。结果表明:在喀斯特地区退耕还林中,随着植被的演替,土壤的渗透性在各层土壤深度中总体呈现乔木人工林<乔灌过渡林<灌木林<乔木疏林地<草地的变化趋势,实施乔木人工林和乔灌搭配式的生态恢复措施,可以有效地改善土壤结构,降低土壤渗透能力。土壤渗透速率与土壤非毛管孔隙度成极显著的正相关关系,与土壤容重成显著正相关关系,与土壤毛管孔隙度和总孔隙度关系不显著。

In order to study the soll infiltration characteristics which different vegetation restoration stages in process of returning farmland to forest in Karst area, selected 5 kinds different vegetation restoration stages sample in which there turning farmland to forest in MHT small watershed, taking natural forest,natural bare land,corn as a comparison to research the changes of permeability that different soil layers in the process of different vegetation restoration stages.The results showed that returning farmland to forest in karst area, with the succession of vegetation, in different soil depth of each layer, the permeability of soil change trend is（Artificial arbor forest） 〈（Arbor shrub transition forest） 〈（bush）〈 （Sparse arbor forest） 〈（grassland）, performing the way of ecological restoration measures that artificial arbor forest and arbor shrub collocation could improve soil structure effective and reduced soil infiltration capacity.Soil infiltration rate and soil non capillary porosity is highly significant positive correlation,with soil bulk density is significant positive correlation, with soil capillary porosity and soil total porosity is non-significant.