桂西南岩溶区封山育林综合技术研究

Comprehensive Techniques of Forest Conservation in Karst Areas of Southwest Guangxi

封山育林是恢复植被的重要技术措施。进行6年封山育林试验研究,分析封山育林期间植被覆盖率、郁闭度、植物丰富度、多样性指数、均匀度、生态优势度等数量特征变化,土壤肥力和水土保持作用的动态变化状况,以及不同树种补植效果。封山育林增加植被覆盖度达20%,郁闭时间缩短30%以上,增加了植物丰富度,提高了土壤肥力,有效防止水土流失。顶果木(Acrocarpus fraxinifolius)、任豆(Zenia insignis)、银合欢(Leucaena leucocephala)、吊丝竹(Dendrocalamus minor)等树种补植效果好。

Fencing off for afforestation was an important measure to restore vegetation. A trial of fencing off for afforestation was carried out in Pingguo County, Guangxi for six years, during which the dynamics of vegetation coverage, canopy density, plant richness, diversity index, evenness, ecological advantages, soil fertility, soil and water conservation effects as well as the effects of replanting with different species were recorded and analyzed. The results showed that the measure increased coverage by 20%, the clos- ing time reduced by more than 30%, increased plant richness and soil fertility, and effectively prevented soil erosion. Replanting with Acrocarpus fraxinifolius, Zenia insignis, Leucaena leucocephala, and Den- drocalamus minor showed good effects.