四川桤木优树选择研究

The selection of the elite trees of Alnus cremastogyne Burk

本文在平昌县种质资源全面调查的基础上按优树选择标准:即生长量(树高、胸径)指标、形质(通直度、尖削度小、分枝大小、分枝角度)指标、材性(木材基本密度、纤维素含量)指标以及抗性(抗旱、抗病虫害等)和适应性指标等进行选择。根据其生长动态和速生丰产性,初选桤木优树300株,并进行跟踪测定,复选出桤木优树100株,并对复选出的优树进行了GPS定位、油漆标记、挂牌编号、拍照登记。全县共挂优树标牌100个。

On the basis of comprehensive investigation of germplasm resources in Pingchang County,dominant trees are selected according to the dominant tree selection criteria,namely,amount of growth（tree height and diameter at breast height）,character index（straightness degree,small taperingness,branching size and branching Angle）,wood property index（basic density and fiber content）and resistance index（drought resistance,disease resistance,etc.）,adaptive index,etc.In accordance with the growth dynamic and fast-growing and yielding ability,300 dominant alders are primarily selected.100 dominant alders are finally selected after tracking and measuring them.And then,the 100 ones are located through GPS,marked with paint,identified with serial numbers,and photographed for registration.A total of 100 dominant alders in the county are identified.