3种皆伐方式对毛竹林更新生长的影响

研究了不同面积规模的全面皆伐(2.0 hm²和3.33 hm²)、带状皆伐(带长均为60 m,带宽分别为3m、6 m和9 m)和块状皆伐(25 m²、100 m²和400 m²)对毛竹林更新生长的影响。结果显示:3种皆伐方式对竹林更新生长影响不同,其中全面皆伐后的竹林长势较差,生物量较低,且皆伐面积越大,竹林更新生长越差;带状皆伐,皆伐带宽为3 m和6 m的竹林更新生长状况均较好,以带宽为6 m时综合效果最好;在块状皆伐中,皆伐面积为25 m²的竹林更新生长最好。此外,皆伐后对毛竹伐桩进行施肥,能够促进竹林的恢复生长;竹林的坡向也影响林分的更新生长,阴坡林分通常在皆伐后2年即能恢复到皆伐前状态,而阳坡林分的恢复则需要3年以上。

Effect of Three Clear-cutting Patterns on the Regeneration and Growth of Phyllostachys pubescens

The effects of complete clear cutting at different scales (2.0 ha and 3.33 ha), strip clear cutting with different bandwidth (3 m, 6 m and 9 m in width along the 60 m strip area) and patch clear cutting in different areas (25 m², 100 m² and 400 m²) on the regeneration and growth of Phyllostachys pubescens forest. The results showed that the three clear cutting patterns had varied effects on the forest regeneration and growth. The bamboo forest grew in poor state after the complete clear cutting with low level of biomass, and the larger the clearing area was the poorer the forest grew. The forest after the strip clear cutting at the width of 3 m and 6 m showed better regenerated growth, while the strip clearing cutting at the width of 6 m achieved the best comprehensive effects. Among the experiments of patch clearing cutting, the forest would grew the best if the clearing area was 25 m². In addition, the fertilization on the bamboo stump after the clear cutting could promote the recovery growth. The slope aspects could also impose some impacts on the bamboo forest regenerated growth. The forest growing on the shade slops could recover after 2 years while those on the south-facing slopes would need 3 years to recover.