湿加松F_2子代一年生苗高的变异

Variations in Height Increments of One-year Old Seedlingsfrom F_2 of Slash×Honduras Caribbean Pine

在四川省泸州市泸县、宜宾市珙县、广元市元坝区进行了湿加松Pee×Pch (Pinuselliottiivar .elliottii×P .caribaeavar .hondurensis)F2 子代育苗试验。结果表明 :3个地点的平均苗高分别为 33 12cm、2 5 4 2cm、2 1 0 3cm ,差异达极显著水平 ,呈现随海拔和主要气象因子的渐变变异趋势 ,海拔越低、年均温和≥ 10℃积温越高、年降水量越大、无霜期越长 ,平均苗高越大且变异系数越小。初步认为湿加松在四川引种的适宜条件为 :海拔 5 0 0m左右 ,年均温≥ 17 0℃ ,≥ 10℃积温 5 6 0 0℃以上 ,年降水量 115 0mm左右 ,无霜期≥ 32 0d。

Seedlings of F2 from Pee×Pch hybrid pine (Pinus elliottii var.elliottii×P.caribaea var.hondurensis) have been raised in counties Luxian, Gongxian and Yuanba of the Province Sichuan. The results show that difference in average heights of one-year old seedlings between the 3 counties is significant at a level<0.01 with 33.12?cm in Luxian>25.42?cm in Gongxian>21.03?cm in Yuanba, exhibiting clonal variation with altitudes and important meteorological data. The seedlings' average height is the taller and its coefficient of variation the lesser, the lower the altitude is, also the higher both the annual average temperature and the annual accumulated temperature≥10?℃, the more the annual rainfall, and the longer the frost-free period. It is suggested that the Pee×Pch hybrid pine should be suitable to Sichuan's sites where altitudes are about 500?m high, annual average temperatures above 17.0?℃, annual accumulated temperatures≥10?℃ above 5600?℃, annual rainfall about 1150?mm, and frost-free period above 320 days.