晋西黄土区人工刺槐林植被结构分析

山西吉县蔡家川流域，在九十年代进行了大面积的人工造林，其中阔叶林主要是刺槐林及刺槐与侧柏的混交林，研究其植被结构对以后人工林的营造和抚育有重要意义。分坡向、坡度和混交类型，选择了不同类型的24块标准地，测定各标准地内乔木的树高、胸径、冠幅和枝下高，利用二元材积表，计算样地的立木材积量，同时测出草本层的生物量和枯落物层的生物量。通过比较草本层、枯落物层的生物量和乔木层的材积量，由此确定在不同的立地类型内种植何种混交林最佳。

Artificial Robinia Vegetation Structure Analysis in Loess Area of Western Shanxi Province

Study on the vegetation structure of well developed artificial forest will benefit for new building and cultivation in future. Preliminary investigations were carried out on the mixed forest in the watershed of Caijiachuan basin in Shanxi province, which a large area of artificial afforestation in the ninety’ s with the broad-leaved forest of mainly robinas and mixed forest by robinas and platycladus. Tree height, diameter of breast-height, crown, and the stem height under branch were measured, within chosen 24 different kinds of sample plots idertified by slope direction, slope grade and forest mixed types. Using the binary volume table, calcu-late the stocking quantity of sample plots, and the biomass of grass and litter were surveyed at the same time. Through comparing the biomass of grass layer, litter layer and tree layer volume quantity, to determine which mixed forest in different site type planting best.