摘要
川西高原位于青藏高原东南部 ,地史条件独特 ,地形地貌复杂 ,气候环境多样 ,孕育有丰富独特的植物资源。研究表明 :①川西高原地区杨树基因资源丰富 ,有青杨派杨树 1 1种、 8个变种和 1 0个天然杂交类型 ,占中国特有青杨 2 4种的 45 8% ,是我国杨树自然分布中心和变异中心之一。②该地区青杨垂直分布表现出替代性 ,水平分布表现为地域性特点。③对气候环境的适应性强 ,从干热河谷到润湿气候至寒湿气候带均有分布。④具有明显速生性 ,从海拔 1 60 0～ 40 0 0m范围内 ,具有 0 77～ 2 40m的年平均高生长量 ,1 0 0～ 3 90cm的年平均胸径增量。⑤多种植物区系成分共存 ,分别有中国 日本森林植物区系成分 ,中国 喜马拉雅区系成分 ,近古热带特有植物成分。⑥该地区古树资源丰富 ,胸径 1m以上的杨树遍布各县 ,最大胸径达到 3 0 5m。表 2参
Located in the southeast of the Qinghai Xizang Plateau,the Western Sichuan Plateau has unique geographical and historical conditions,complicated geological physiognomy,diversified climate environments,which bear abundant and rich plant resources.The findings show:①The Western Sichuan Plateau is abundant in poplar gene resources.With 11 species of poplar,8 varieties and 10 hybrids accounting for 45 8% of 24 poplar species special in China,it is the natural distribution and variation center for poplar in China.②The distribution of poplar is substitutive vertically and with regional features horizontally.③Poplar have good adaptability to climate environments and distributed in vast areas ranging from dry and hot valley to moist climate,cold and warm climate areas.④Poplar grow very fast.Within the range of 1 600～4 000 m,poplar can grow 0 77～2 40 m in length and 1 0～3 9 cm in diameter.⑤Various floristic elements including China Japan Flora,China Himalayas Flora and approximate ancient tropical zone flora are coexisting in the area.⑥The area is rich in ancient trees.Poplar trees with diameter over 1 00 m are spread throughout all counties in the area.The longest diameter of poplar is 3 05 m.
出处
《浙江林学院学报》
CAS
CSCD
北大核心
2003年第1期27-31,共5页
Journal of Zhejiang Forestry College
基金
"八五"国家科技攻关项目 (85 0 190 10 4)
关键词
川西高原
青杨派
基因资源
变异
The Western Sichuan Plateau
Tacamachaca
gene resource
variation (genetics)
