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运用样带样方调查法,对比不同恢复方式和地形条件下退耕林分的物种多样性,以期为晋西黄土区植被恢复效果评价和经营管理提供参考.结果表明:恢复方式对退耕林分物种多样性具有显著影响.自然恢复林物种数为刺槐人工林的1.6倍,Shannon指数大于刺槐人工林,Pielou指数小于刺槐人工林.物种多样性受坡位影响显著,各指数均表现为沟底>沟坡>梁峁坡>梁峁顶;坡向对退耕林分物种多样性影响不显著,各指数均表现为阴坡>阳坡.物种多样性受地形和恢复方式综合作用影响显著,在自然恢复林阴坡沟底处最高,物种均匀度在刺槐人工林阴坡沟底处最高.从提高物种多样性角度,黄土区植被恢复在遵循适地适树原则的同时,应参照自然恢复林分,在不同地形部位采用不同的造林设计.
Using the sample-quadrat method to compare the species diversity of the conversion forests under different restoration methods and topographical conditions, and to provide references for the evaluation and management of the restoration of vegetation in the loess areas in western Shanxi Province, the results show that: Diversity.The results showed that the natural restoration forest species was 1.6 times of that of the natural acacia plantation and the Shannon index was higher than that of the acacia plantation and the Pielou index was less than that of the acacia plantation.The species diversity was significantly affected by slope position, Slope slope> beam slope slope> beam ridge top; the slope direction had no significant effect on the species diversity of the cropland, and each index showed a shady slope> sunny slope. Species diversity influenced significantly by the combination of topography and recovery methods, The restoration of the bottom of Linlin gully was the highest, and the species evenness was the highest at the bottom of shady gully locust forest plantation. From the perspective of increasing species diversity, the restoration of vegetation in the loess area should follow the principle of " , In different parts of the site using different reforestation design.