衡阳紫色土丘陵坡地植被恢复过程中土壤质量评价

摘要

本文以典型的衡阳紫色土丘陵坡地不同恢复阶段为研究对象,采用空间序列代替时间序列方法,选用立地条件基本相似草坡(grassplot,GT)群落、灌草(frutex and grassplot,FG)群落、灌丛(frutex,FX)群落和乔灌(arbor and frutex,AF)群落为研究对象,采用土壤质量综合指数的研究方法探讨植被恢复对土壤质量的影响.结果表明:随着植被恢复进行,土壤质量得到明显改善(P＜0.05);随着土层深度的增加,土壤的改良效果明显降低(P＜0.05);不同植被恢复阶段的土壤质量的综合指数为乔灌群落(0.528)＞灌丛群落(0.522)＞灌草群落(0.485)＞草坡群落(0.482).研究表明:植被恢复改善了衡阳紫色土丘陵坡地的土壤质量.%By using the spatial series to replace time series,four typical sampling plots [grassplot(GT),frutex and grassplot (FG),frutex (FX) and arbor-frutex (AF) community] were selected to study the effects of re-vegetation on soil quality with the method of integrated soil quality index.The four communities on sloping-land with purple soils were similar and typical,and denoted four different successive stages in Hengyang of Hunan Province,South-central China.Results indicated:Soil quality was obviously improved in the process of re-vegetation(P＜0.05);With increasing soil depth,effects of soil improving decreased(P＜0.05);Integrated soil quality index in different re-vegetation stages followed the order as AF community(0.528)＞FX community(0.522)＞FG community(0.485)＞GT community(0.482).All the results indicated soil quality was improved in the process of re-vegetation on sloping-land of purple soils in Hengyang of Hunan Province,South-central China.