为了探索人工杉木林丰产的技术经营措施,我们对桂花林场自1975年以来所建立的18块固定样地进行筛选,试图用正交设计试验法,对人工杉木林间伐作一些研究和探讨。一、试验材料和方法〈一〉试验样地:设在桂花林场南山分场雪花山和洪家岭。土层厚度一般80—100 cm,土壤为页岩坡积物形成的石渣黄沙土。石砾含量20—30％、结构粒状、有效土层的紧实度较松、PH值5.65—6.70、有机质1.00—1.24％、 In order to explore the technical management of Artificial Cunninghamia lanceolata plantation, we selected 18 fixed plots established by Guihua Forest Farm since 1975, and tried to use orthogonal design test method to study and study some artificial Cunninghamia lanceolata plantations. First, the test materials and methods Test sample: Located in Guihua farms Nanshan Division Snow Hill and Hongjialing. The thickness of the soil layer is generally 80-100 cm, the soil is gravel yellow sand soil formed by shale slope sediment. The content of gravel is 20-30%, the structure is granular, the compaction degree of effective soil is looser, PH value is 5.65-6.70, organic matter is 1.00-1.24%