青海祁连地区小叶杨优树选择研究

Selection of Superior Trees of Populus simonii in Qilian County

青海祁连地区小叶杨天然林是青海小叶杨的主要分布地区。祁连县小叶杨主要分布在八宝镇、扎麻什乡等地,通过林分调查,确定小叶杨优良林分,在优良林分中采用3株优势木对比法,以树高、胸径、单株立木材积为生长指标,结合树干通直度、圆满度、枝下高、自然整枝程度、侧枝粗细度、冠幅等形质指标的综合评分,展开垂枝小叶杨优树选择工作,从而为祁连地区小叶杨优树选择提供依据。

The Populus simonii forests are mainly distributed in Qilian region,particularly in Babao Town,Zhamashi Village and other areas,Qinghai Province,China.By forest survey,we determined the forests with good performance of P.simonii.We conducted comparative approaches of dominant species based on height,diameter at breast height and volume measurement of standing tree by sampling three tree individuals.Considering the above-mentioned three indicators,we built a scoring system for the good performance of P.simonii based on trunk straightness,fullness,height below canopy,natural pruning degree,side branch thickness,and canopy width.Our study provided reference for the selection of P.simonii with good performance.