杉阔混交人工林皆伐前后植物种类组成变化

Change of Vegetation Species of Artificial Mixed Forests of Chinese fir and Broad-leaf Trees Before and After Clear Cutting

通过对皆伐作业前后杉阔混交人工林林地植被变化的调查分析,结果表明:皆伐后一部分植物消失(衰退种)、一部分植物增加(侵入种),但优势植物基本保留下来(保留种),这主要是由于迹地清理方式采用带堆法的缘故.皆伐后灌木层种数减少,草本层种数增加,且皆伐对灌木层植物的干扰影响比草本层的大.因此,为了减小皆伐对林地生态环境(植被和水土流失)的负面影响,使皆伐后林地植被能尽快恢复,建议皆伐后迹地清理方式采用沿等高线分布的带堆法,避免采用火烧法.

Through investigating and analyzing the change of forest land vegetation of artificial mixed forests of Cunninghamia lanceolata and broad-leaf trees before and after clear cutting,the results show that some species invaded into the clear cutting site and other species declined after clear cutting.However,the dominant species kept the same after clear cutting.This is because belt-shape piling-up was used in the slash clearing ways.The plant species in shrub layer reduced,while the herbaceous layer plant species increased.And effect of clear cutting on shrub layer plant is heavier than the herbaceous layer plant.Therefore,it suggests that belt-shape piling-up dispersed along contour be selected and burning be avoided to use in the slash clearing ways to reduce the negative influence of clearing cutting on forest land ecological environment (mainly including vegetation and soil erosion)and make forest land vegetation to recover more quickly after clear cutting.