西南桦种源早期选择试验

Early Selection in a Provenance Trial of Betula alnoides

通过对4年生西南桦25个种源试验林的生长观测及统计分析,结果表明:西南桦种源试验林的造林成活率比较高,平均达93%,4年生的平均保存率仍有83.0%,经方差分析结果显示种源间的成活率和保存率达显著或极显著差异;生长性状方差分析结果说明,不同年龄的胸径、树高、单株材积和蓄积量在种源间均存在显著或极显著差异;从树高、胸径、单株材积和蓄积量的综合分析比较结果看出,云南的屏边、西畴、元阳、江城和广西的凌云、靖西、那坡、百色、田林、苹果等10个种源生长表现良好,可初步定为适合试验区生长的优良种源,为今后引种的重点;勐腊、镇沅、景谷、风庆、双江、东兰和德保共7个种源生长最差,在没有进一步开展其它种源试验以前不宜扩大引种栽培。

Through the growing observation and statistical analysis for 25 provenance test plantations of Betula al- noides, we achieved results as follows： High survival was found in the trial, being 93% at age of seven months and 83% at 46 months. Moreover, ANOVA analyses showed that the provenances differed in survival at 0.05 or 0.01 significant level. ANOVA analyses showed that both the provenances differed in height, DBH, volume, survival, and canopy width at various ages at 0.05 or 0.01 significant level, indicating the 10 provenanceswith thepossibility of reli- able selection of superior provenaneesandthe key spots for introduction. They were： （Pingbian, Yunnan）, （Xichou, Yunnan）, （Yuangyang, Yunnan）, （Jiangcheng, Yunnan）, （Lingyun, Guangxi）, （Jingxi, Guangxi）, （Napo, Guan- gxi）, （Baishe, Guangxi）, （Tianlin, Guangxi）, （Pingguo, Guangxi）. Meanwhile, these 7provenances showec the worst growth andwere inappropriate for introductionuntildevelopingotherprovenance tests. They were： （Mengla, Yunnan）, （Zhenyuan, Yunnan）, （Jinggu, Yunnan）, （Fengqing, Yunnan）, （Shuangjiang, Yunnan）, （Dongnan, Guangxi） and （Debao, Guangxi）.