龙须草复合种植技术对紫色土小生境的影响

紫色土的植被恢复是中国植被恢复难题之一.为了研究龙须草植被改善紫色土生境的效果,将引种龙须草后植物群落物种多样性与土壤环境因子的变化相结合,寻找最适宜紫色土地区生态恢复的龙须草植被恢复模式.设置3种龙须草植被恢复地模式（人工恢复地Ⅰ、Ⅱ和自然恢复地Ⅲ）,于2010年7月中旬在湖南松林村进行野外调查.通过群落分类双向指示种分析和群落排序冗余分析表明：1）土壤全氮量、土壤有机质质量分数、坡位和恢复模式是影响群落多样性的主要环境因子;2）3种植被恢复地模式中,人工恢复地Ⅱ的群落Gleason丰富度指数最大（坡上位2.171,坡下位5.863）,土壤全氮量和土壤有机质质量分数有明显提高.因此,利用龙须草进行植被恢复时应优先选取恢复效果最好的人工恢复地模式Ⅱ.

Effects of Eulaliopsis binata introduction on the vegetation recovery of purplish soil habitat

Vegetation restoration on purplish soil is one of the vegetation recovery challenges in China.In order to test the effects of Eulaliopsis binata vegetation on the improvement of purplish soil habitat,species diversity of the community that was planted with E.binata in correlation with the change of soil environmental factors was studied for the purpose of finding the most suitable recovery mode.A field survey was conducted in communities with different recovery modes （artificial restorations Ⅰ,Ⅱ and natural restoration Ⅲll） in mid July 2010 in Songlin,Hunan Province.All the collected data were analyzed utilizing TWINSPAN and RDA.The results show that 1） the species diversity are mainly influenced by the amount of total nitrogen,organic matter in soil,slope position and recovery mode and 2） the Gleason richness indices of upper slope and lower slope in artificial restoration Ⅱ were 2.171 and 5.863,respectively,followed by artificial restoration Ⅰ and natural restoration Ⅲ.And the soil total nitrogen and organic matter in artificial restoration Ⅱ increased significantly.Therefore,the artificial restoration lⅡ tends to be more effective when using E.binata for vegetation recovery.