摘要
应用生态位理论,以黄土半干旱区6个不同密度林分林下草本层植被为研究对象,以林分密度作为资源轴,以物种重要值为生态位计测的状态指标,对林下植被进行生态位计测和分析,揭示林内资源环境利用状况。结果表明:林下植被的生态位宽度值普遍较小,其中阿尔泰紫婉、铁杆蒿等生态位宽度较大,这与无林地相似,同时物种间生态位重叠并不普遍,重叠度普遍不大,各种对间对资源的共享趋势不明显,生态位发生分离,显示了林下植被状况差。
Based on the investigating undergrowth vegetation in the forests with different densities in semi-arid region on the loess plateaus, the niche of undergrowth vegetation are described and analyzed, with different densities as the resource state and with the important value as the resource state descriptor of the niche. The results indicate that most of undergrowth vegetation have lower niche breadth values, but Heteropasppus altaicus and Arremisia sacrorum have higher niche breadth values, 59.7% of the herbage species have niche overlaps, but which are lower. All the above reveal that the bad condition of undergrowth vegetations.
出处
《水土保持学报》
CSCD
北大核心
2005年第5期162-165,共4页
Journal of Soil and Water Conservation
基金
教育部科学技术研究项目(重大10407)"北方退耕还林区水土保持植被恢复与重建技术研究"
国家自然科学基金(30371172)共同资助
