海拔对引种火炬松林分生长量的影响研究

Study on Impact of Altitude on Growth Amount of Pinus taeda Stand

在贵州省龙里林场进行不同海拔火炬松引种造林试验,经方差分析及多重比较,结果表明,随海拔的降低,火炬松林分平均胸径、平均树高、平均单株材积生长量逐渐增大;随海拔的增高,林分受凝冻灾害程度显著加深,海拔1 300 m的火炬松林分受灾情况最严重,部分林分已无培育价值;海拔高度是贵州省中部地区引种火炬松的首要限制因子,在海拔1 300 m及其以上的山地不宜发展火炬松.

Afforestation experiments of introduced Pinus taeda have been conducted at different altitudes in Longli forest farm in Guizhou province. The results of variance analysis and results＇ comparison show that Pinus taeda＇ s average breast diameter, height, individual timber volume gradually become bigger with lowering of the elevation; while the stand suffers more severely frozen disaster with rising of the elevation. The most damaged stand is at the elevation of 1300m so that partial stand has no longer actual values for its cultivation. Thus, the altitude is the first critical factor for introducing Pinus taeda in middle area of Guizhou. It is unsuitable for developing Pinus taeda above 1300m in the mountains.