Ⅰ-69杨胶合板用材林最佳造林密度研究

STUDIES ON THE OPTIMUM PLANTING DENSITY OF I-69 POPLAR PLANTATION FOR PLYWOOD

根据２９０块Ｉ－６９杨标准地调查资料，以密度效应模型为基础，以林分胶合板材产量最大为目标，导出了最佳造林密度模型。通过对模型拟合，采用最佳造林密度模型求得Ｉ－６９杨胶合板用材林造林密度为小于２８６株／ｈｍ２。立地指数小于等于１６ｍ的立地不宜用于营造胶合板用材林。要实现胶合板材培育的基本目标Ｄ＞２６．８ｃｍ，林分优势高必须大于２８．９ｍ。以选择立地指数大于等于２０ｍ的立地为佳。在立地指数１８、２０、２２ｍ条件下，满足Ｉ－６９杨胶合板用材林培育目标的最短轮伐期分别为１１、１０、９ａ；最大造林密度为２５７、２４０、２３６株／ｈｍ２。

According to the survey data of 290 valuation areas and the stand denstity effect model, to aim at maximum yield for stand plywood timber and to deduce the optimum planting density model. Through fitting the model, planting density of plywood timber forest of poplar clone I-69 should be not more than 286 trees per hm 2. The land with site index not more than 16m is not suited to management of plywood timber forest. For the sake of practice basic objective of cultivation plywood timber D >26. 8 cm, stand dominant height should be more than 28.9 m. The best to select land with site index is more than or equal to 20m for management of plywood timber forest of poplar clone I-69. On the condition of 18, 20, 22 m site indices, the shortest rotation fitted with cultivation objective of plywood timber forest of poplar clone I-69 is 11, 10, 9 years respectively;the most plantng density is 257,240,236 trees per hm 2 respectively.