南方马尾松含水率特征及其模型研建

Moisture Content and Model of Pinus Massoniana in Southern China

以我国南方马尾松为研究对象,利用2009年森林资源连清马尾松生物量调查数据,对马尾松不同器官的含水率分布特征及其动态变化进行研究,同时建立基于年龄、起源、海拔、土壤类型等因子的含水率模型。结果表明:①不同起源的马尾松林木含水率存在显著性差异,人工起源的平均含水率为58.85%,天然起源的平均含水率为55.61%;按马尾松各器官综合平均含水率高低排列顺序为树叶>树根>树干>树枝>树皮;②随着马尾松林龄或龄组的增长,各器官含水率均降低;③马尾松树干(去皮)中部位(3.5/10树高)处含水率可以作为整株平均含水率;④马尾松含水率与年龄、树高、胸径、坡度、起源、土壤类型、坡度、海拔、冠幅之间相关性达显著水平,其中以年龄与其相关性系数最高,为-0.652,与省份、坡向、坡位相关性不显著;⑤建立包含马尾松年龄、起源、坡度、海拔等多因子的林木含水率模型,模型拟合度R2均在0.50以上。

Based on the biomass data of Masson pine（Pinus massoniana）in southern China surveyed in CFI 2009,the distribution and dynamic changes about the moisture content from different organs of Masson pine were studied.Different mathematical models were used to describe the relationship between moisture content and age,origination,altitude,soil type etc al.The main results showed that： ①The moisture content from the same origins with different origination exist significant differences,the average moisture content from artificial origin was 58.85%,the average moisture content from natural origin was 55.61%,the average moisture content of different organs from high to low was leavestree rootstembranchbark;②With the growth of stand age and age group,the moisture content decreased significantly;③the moisture content of stem（peeled） in 3.5/10H can instead the average moisture content of whole;④The relations between moisture content and age,height,diameter,slope,origin,soil type,slope,had significant correlation,of which the coefficient associated with age was the highest,was-0.652,the relations between moisture content and soil thickness,different provenance had no significant correlation;⑤the R2 of the model which included age,origination,slope,altitude was larger 0.50.