塞罕坝华北落叶松人工林最大密度线模型研究

Study on maximum density line model of Larix principis-rupprechtii in Saihanba Mechanized Forestry Farm

构建包含主要影响因子的最大密度线模型,为确定塞罕坝华北落叶松人工林适宜经营密度提供科学依据。本研究利用2019年塞罕坝森林资源清查数据,基于4种常用的最大密度线模型,构建包含主要影响因子的华北落叶松人工林最大密度线模型。结果表明:(1)4种基础模型的确定系数分别为0.388、0.348、0.348、0.419,其中模型M 4的确定系数最大,拟合效果最优,最适用于塞罕坝华北落叶松人工林;(2)通过相关分析确定林龄、坡向是影响林分密度的主要因子,并在P<0.01水平上呈极显著相关;(3)构建了包含主要影响因子的华北落叶松人工林最大密度线模型,其中同时包含林龄和坡向的最大密度线模型拟合精度最高,其确定系数为0.720,拟合效果最优,该模型可为塞罕坝华北落叶松人工林多功能可持续经营提供科学依据。

The maximum density line model including main influencing factors was constructed to provide a scientific basis for determining the suitable management density of Larix principis-rupprechtii plantation in Saihanba.The study used the inventory data of Saihanba forest resources in 2019,based on four common maximum density line models to construct the maximum density line model of Larix principis-rupprechtii plantation including main influencing factors.The results showed that:(1)The determination coefficients of the four basic models were 0.388,0.348,0.348 and 0.419 respectively,among which the determination coefficient of model M 4 was the best fitness,which was the most suitable for Larix principis-rupprechtii plantation in Saihanba.(2)Through correlation analysis,it was determined that forest age and slope direction were the main factors affecting stand density,and had a significant correlation at the level of P<0.01.(3)Constructed the maximum density line model of Larix principis-rupprechtii plantation including main influencing factors,in which the maximum density line model including forest age and slope direction had the highest fitting accuracy,its determination coefficient was 0.720,and the fitting effect was the best.The model could provide a scientific basis for the multi-functional sustainable management of Larix principis-rupprechtii plantation in Saihanba.