| Growth Variation and Early Selection of Betula Platyphylla in Natural Stands |
| |
| 作者姓名： | 宋虹 夏德安 于凤华 |
| |
| 摘 要： | IntroductionEarlyseIectionisanimportantpartforforesttreeim-provement.TreequaIityandproductioncanbeim-provedthroughselection.lnrecentyears,wehavepaidmoreattentiontoearlyselectionandprediction.EarIyselectionisanimportantpartforforesttreeimprove-ment.Thegene…
|
Growth Variation and Early Selection of Betula Platyphylla in Natural Stands |
| |
| Zhu Hong, Xia De-an.Growth Variation and Early Selection of Betula Platyphylla in Natural Stands[J].Journal of Forestry Research,1997(4). |
| |
| Authors: | Zhu Hong Xia De-an |
| |
| Institution: | Zhu Hong; Xia De-an(Northeast Forestry Harbin 150040 P. R. China)Yu Fenghua(Forestry Investigation and Design Institute Heilongjiang Province) |
| |
| Abstract: | The stem analysis of Betula platyphylla in natural forest at the Maoershan Forest Experimental Station of Northeast Forestry Universitu. showed that the growth variation of the trees. including height and diameter breast height decreaseswith the increase of the age. There is the turning point for the growth variation of the tree from acute change to relative sta-bility when the trees are in eighteen years old. There are signiticant difttrences among the height. diameter and volumegrowth of the trees at that time. Theretbre. the optimal age for carly seleetion of this species in natural stands is eighteenyears old (18 a). Diameter is used as main index for eary seleclion and height growth as auxiliary one. |
| |
| Keywords: | Betula platyphylla Early selection Growth variation |
| 本文献已被 CNKI 等数据库收录！ |
