喀斯特石漠化皆伐迹地不同微地形和小生境下的土壤侵蚀差异

目的]探讨喀斯特山区皆伐迹地不同微地形、小生境下土壤侵蚀的差异,为喀斯特皆伐迹地生态修复及防治提供依据。方法]研究区采用铁栏围成封闭区域,用测钎法以1m×1m的距离布设测钎,对山地不同微地形、小生境的土壤侵蚀进行原位年监测,用箱图比较其土壤侵蚀深度差异,并作显著性分析。结果]研究区不同微地形、不同小生境在土壤侵蚀程度上差异明显,微地形土壤侵蚀深度总体呈现为:凸形平直形凹形,微地形与土壤侵蚀呈显著相关。小生境土壤侵蚀平均深度表现为:石沟石土面石侧土面石缝,组间小生境与土壤侵蚀无明显相关,但石沟与土面呈现显著相关。结论]岩溶区山地皆伐迹地应据微地形、小生境不同,实施差异化生态修复及防治工作,凸形微地形和石沟、石土面小生境是防治的关键。

Differences of Soil Erosion Between Micro-topography and Microhabitat in Clear-cutting Site of Karst Rocky Desertification Area

Objective] The differences of soil erosion between micro-topography, microhabitat in clear-cutting site of the karst region were studied in order to provide suggestions for ecological restoration and control in clear-cutting site of the karst region.Methods] Soil erosion monitoring method of pin was employed to monitor annually soil erosion in situ (differentmicro-topography, microhabitat) at a distance of 1 m×1 m within a research area enclosed by iron bars, and box chart and significance test were utilized to compare the difference of soil erosion between them.Results] It was found that significant difference in the degree of soil erosion of different micro-topography and microhabitats in the study area. More specifically, depth of soil erosion of micro-topography manifested an overall scale of convex > flat > concave, while depth of soil erosion of microhabitat demonstrated an overall scale of stone-drain > stone soil surface > the side of stone > soil surface > rock tunnels. There was a significant correlation between micro-topography and soil erosion, while no significant correlation existed between microhabitats and soil erosion in groups, but stone-drain and soil surface were respectively correlate to each other significantly.Conclusion] Ecological restoration and control should be carried out according to different micro-topography and microhabitat in karst mountain clear cutting site, and the key of control lied in the convex micro-topography, the microhabitat of stone-drain and stone soil surface.