湿地松工业原料林培育模式的研究 Ⅰ.纸浆林适宜经营密度的确定

通过对在闽中山地不同密度湿地松林分的研究表明，湿地松速生期早，是培育短周期工业原料林的优良树种．湿地松造纸林树冠重叠系数为１．２５１７时，可获得较大的蓄积量．通过湿地松生长模型的建立，导出湿地松的适宜经营密度上限．根据湿地松短周期的培育目标，确定出湿地松纸浆林的两种密度模式，即间伐模式（初植密度为３２４７株／ｈｍ２，第１０年间伐，强度２５％，第１５年主伐）和不间伐模式（初植密度为２４３８株／ｈｍ２，第１５年主伐）．研究结果可为湿地松纸浆林的培育提供指导．

A Study on Cultivation Patterns of Industrial Raw Material Forest of Slash Pine (Pinus elliottii) Ⅰ.Definition on the Appropriate Management Density of Paper-Pulp Forest

The slash pine stands with different densities in mountainous region of the middle part of Fujian province were studied in this paper. The result showed the quick growth period of slash pine was early and slash pine is a good tree species to be cultivated for industrial raw material forest. When overlapping coefficient of crown of paper-pulp forest of slash pine is 1.251 7, the stand can get a bigger stock. The maximum management density of slash pine forest stand was calculated out by the growth model. Two cultivation patterns of the slash pine forest for paper-pulp were defined according to the cultivation arms of short cutting period of slash pine. One is middle cutting patterns with a forestation density of 3 247 trees/hm\+2 and middle cut out tenth year with the strength of 25%, finally cut at 15th year, the other is not middle cutting model with a forestation density of 2 438 trees/hm\+2 and finally cut at 15th year. The conclusion can provide direction for cultivation of paper-pulp forest of slash pine.