桥山林区山杨根蘖更新的研究

本文研究了山杨根蘖更新与主伐方式、立地因子等方面的关系。结果表明:根蘖萌苗量皆伐迹地明显高于择伐迹地,且均自山坡上部到下部逐渐减少。而萌苗质量却是以择伐迹地和山坡下部较好。主伐前郁闭度大的林分和混交林的更新比郁闭度小的林分和纯林好。同时提出了改善更新效果的一些措施意见。

Regeneration of Populus davidiana by Root Sprouts in Qiaoshan, Shaanxi

Describes the regeneration of Populus davidiana by root sprouts in relation to its felling systems and site factors. The number of root sprouts is obviously much more in clear-cutting area than in selection-cutting area, but they are decreased gradually in both areas from uphillside to downhilllside. The quality of root sprouts is better in selection cutting area and downhillside than in clear -cutting area and uphillside. Root sproutings are better regenerated in dense and mixed stand than in thin and pure stand before main cutting. Suggestions to improve regeneration effect are also provided.