云南红豆杉不同粗度枝干树皮率和含水量研究

Bark and Water Content in Different Diameter Stems and Branches of Taxus yunnanensis

随着红豆杉产业的发展,以及多种采收模式规模化和人工林树龄的增长,树皮作为云南红豆杉植株中紫杉醇含量最高的部位,在紫杉醇原料供应中占有越来越重要的地位。参照我国林木径级的常规划分标准,以1cm为间距将云南红豆杉人工林的枝干粗度划分为5级。通过对昆明试验点采集的270份枝干样品和宜宾试验点采集的67份枝干样品的研究测定,结果表明：云南红豆杉不同枝干的鲜重树皮率为12.88%-28.98%,干重树皮率为11.01%-26.36%,枝干平均含水量为53.89%,树皮平均含水量为60.74%;树皮率随枝干粗度的增加而降低,含水量随枝干粗度的增加无明显的变化规律;用11个回归曲线模型拟合分析了树皮率与枝干粗度的相关性,幂函数曲线的拟合效果最好,依此计算出鲜重树皮率和干重树皮率随枝干粗度增加的回归方程。

With the development of Taxus industry,bark is becoming more important as the raw medicinal material due to the highest content of taxol in Taxus yunnanensis.With reference to classification of tree diameter class standard,the stem and branch diameter of Taxus yunnanensis in plantation could be divided into 5 classes.A study was carried out on 270 stem and branch samples from Kunming site and 67 samples from Yibin site.The result shows that the content of fresh bark weight varied from 12.88% to 28.98%,the content of dry bark weight varied from 1 1.01%to 26.36%.The mean water content of stem and branch is 53.89%,and of bark is 60.74%.The variety of water content with the increase of stem and branch diameter class is irregular.The content of fresh and dry bark weight decreased obviously when the stem and branch diameter increased.The relationship between the bark content and the stem and branch diameter could be described by the power function equation.