西南桦中幼龄人工林抚育成效评价

以林龄5 a、造林密度2 m×3 m的西南桦人工林作为研究对象,通过生长伐处理,连续3年对标准地林分生长、林分结构、林分健康、森林植被情况进行监测。结果表明,生长伐可有效提高目标树及辅助树单位面积材积,未降低林分的物种多样性,林分结构得到调整——乔木层、灌木层和草本层的物种存在一定的变化,各层次所占比例也发生了较大变化。

Effectiveness Evaluation of Plantation Tending on Young Betula alnoides Forest

To evaluate the effectiveness of accretion cutting on Betula alnoides plantations tending, a research was processed on young Betula alnoides plantations with age of 5 years old, and planting density of 2m × 3m. After three year constantly accretion cutting, a survey on forest stand of sample plot, stand structure, forest stand health, forest vegetation, etc. , has been carried out. Result showed that： accretion cutting could increase volume of timber per each unit area both Betula alnoides and other auxiliary trees; Accretion cutting would not change the biodiversity of plants in the plantations, but plantation structure has been changed, the plant species in shrub layer and herb layer also been changed a little, and the proportion of each level been changed greatly.