思茅松产脂力分析

摘要

To breed Pinus kesiya cultivar that produces high quantity of resin,‘V’ drop rossing method was used to measure resin yield from 200 sampled trees, and correlations between yield and three tree factors, including diameter at breast height, crown breadth and tree height, were conducted. Results showed that average resin yield was 7.18 g per cut. Resin yield was positively cor-related with diameter at breast height, with the correlation coefficient being 0.853. Although, within the same class of diameter,P. kesiya could be divided into groups of high-yield and low-yield. P. kesiya G33-6 yielded the highest quantity of resin at 25.86 g when its diameter at breast height was about 33-34 cm. Air temperature was likely to influence resin yield, resulting in averagely higher yield in rainy season than dry season. Despite of yield reduction in dry season, high-yield cultivars still produced higher levels of res-in than those from low-yield cultivar in rainy season. To summarize, genetic factor was more likely to play the pivot role in determi-ning resin yield.%采用V型下降采脂方法对200株思茅松进行产脂力测定，并结合3个主要树体因子(胸径、冠幅、树高)进行相关性分析.结果表明：与产脂力相关性最强的树体因子为胸径，相关系数为0.853，平均单刀产脂力为7.18 g；在相同径级条件下，思茅松的产脂力表现出显著的差异，均存在相对高、低产的思茅松；当径级为33~34 cm时，思茅松G33-6最高产脂力达到25.86 g；思茅松在雨季的产脂力比旱季高，产脂力与季节温度有关.表明产脂力可能与思茅松本身的遗传因子相关.