摘要
火炬松原产美国南部14个州,分布在28～39°N,75～97°W,海拔500～666m处。分布区内气候变化较大,年均温13～19℃,月平均温2.2～17.2℃,年降水1016～1520mm,分布区北部无霜期6个月。1951年美国开展的火炬松种源试验,将美国南方划分为4个种源区,即密西西比区,此区种源较耐旱,抗锈病强;靠墨西哥湾三个州为一个区,这里气候温暖,雨量充沛;最北部为一个区,当地火炬松最耐寒,但生长较慢;南卡和北卡州为一个区,其中沿海较山麓种源生长快。
Provenance test of cold-hardy Loblolly Pine were carried out at 4 sites in Jianghuai Area in 1983. 5-year results indicate that the growth of height and diameter of different seed sources are significant. A significant negative correlation was found between height growth and mean temperature. The best performing seed sources come from the northern and northeastern part of the natural range. 5 superior seed sources were selected for each experiment location based on their growth performance, survival and other adaptablities to the environment.
出处
《林业科学研究》
CSCD
北大核心
1991年第4期441-446,共6页
Forest Research
基金
"七五"攻关课题
