基于NFI和DEM数据的浙江森林立地分类研究

以2009年浙江省森林资源连续清查数据及同步获取的数字高程数据为数据源，依据土壤类型划分立地类型组，分别采用坡位指数、坡向角对坡位、坡向进行赋值，进一步分别对各立地类型组中的海拔、坡向、坡度、坡位、土层厚度、腐殖质厚度和枯落物厚度7个立地因子进行主成分分析，确定主导立地因子，依据主导立地因子划分立地类型。结果表明：浙江省森林立地可划分为7个立地类型组、400个立地类型，实现了更为精准的立地分类，可为造林规划、抚育更新、林业生态建设等提供参考依据。

Forest Site Classification Based on NFI and DEM in Zhejiang Province

Based on national forest inventory data (NFI) in Zhejiang Province in 2009 and the digital elevation data (DEM) obtained synchronously as the data source, according to the soil type, the site type group was divided, and the slope position index and slope direction angle were used to assign the slope position and slope direction, respectively. The principal component analysis of the site factors of elevation, slope direction, slope, slope position, soil thickness, humus thickness, and litter thickness in each site type group was performed to determine the dominant site factor, and the site type was divided according to the dominant site factor. Results show that the forest site in Zhejiang Province can be divided into 7 site type groups and 400 site types, which can achieve more accurate site classification, and provide reference basis for afforestation planning, tending and renewal, and forestry ecological construction.