摘要
我们从1984年开始在辽宁建平县北部老哈河沿岸进行杨树引种与抗寒选择试验。经过半个轮伐期测试,现已筛选出五个可供在本区推广的欧美杨和美洲黑杨耐寒良种无性系。一、试验地区自然概况本项试验设置在辽宁省建平县北部的国营黑水机械化林场。地理位置:东经119°15′—119°38′,北纬41°52′—42°22′。试验地区属于温带半干旱季风型大陆性气候区,主要气象指标为:年平均气温5.5℃,极端最低气温-31.4℃,≥10℃年积温2810℃,年平均日照2963h,年无霜期128天。
There is a large area suitable for high yield plantation of poplar in the cold semi-arid area in North China. But the wide utilization of good clones of P. euramericana and P. deltoides introduced in this area is restricted by the dry and cold climate. We have recently introduced 45 poplar clones from the high latitudes of Europe and America in order to bring the potential ability of this land into full play.We have selected 4 clones of P. eurmericana and 1 clone of P. deltoides through isolated raising seedlings, disease-resistant and coldresistant selection, as well as cluster analysis of growth figures of these clones. The average tree height of the selected clones is 14.5—16.8m in the 6-year-old plantation, the average DBH, 19. 5—22. 9cm, the average volume per tree, 0.1956—0.3126m, and the form figureof the stem, 0.4476—0.4650. The average volume increment per hectare per year of these clones is 46.3%—134.2% higher than that of control cultivar, P. Beijingensis.The yields level of poplar plantation in this area will be increased in a large degree as a result of the extension of these cold-resistant and fast growing clones.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1992年第4期353-356,共4页
Scientia Silvae Sinicae
关键词
寒冷半干旱区
杨树
引种
Cold semi-arid area
Good clones of poplars
Populus euramericana
P. deltoides
