马尾松纸浆原料林对不同间伐强度的生长反应

马尾松(ＰｉｎｕｓｍａｓｓｏｎｉａｎａＬａｍｂ)生长快、适应性强,木材纤维含量4551%～6192%,纤维长度达44～6.5ｍｍ(周政贤等,1989),是造纸工业原料林发展的主要树种之一。但由于湖北省本地种源的马尾松在干形、材性、速生丰产性、耐瘠薄和抗病虫害等方面均不如南方种源的高州马尾松(李传志,1983),因而湖北及其它省市已从广东大量引种高州马尾松。为更好地掌握高州马尾松的生长规律,确定其造纸工业原料林的合理密度和经营管理措施,笔者对高密度高州马尾松纸浆原料林对不同间伐强度的生长反应进行了试验研究。1　试验地点与材料高州马尾松…

THE GROWTH RESPONSE OF MASSON PINE PULPWOOD TO DIFFERENT THINNING INTENSITIES

The growth responses of Gaozhou masson pine pulpwood to 4 thinning intensities were studied by comparative analysis.The results indicate d that,under the identical characteristics of soil profile and ground vegefation in different thinning intensities,the variations of DBH and height under branch have significant differences with the maximum accretion of DBH and the lowest a ccretion of height under branch in 1.5m×2.0m stand,while the average incr ements of tree height and crown diameter were not obviously different.The aboveg round biomass increments of 1.5m×1.5m and 1.5m×2.0m stands were higher than those of other stands by thinning within 3 years.Under the comprehe nsive survey of the growth responses of pulpwood to thinning intensity and the w ood property for papermaking,the proper density of Gaozhou masson pine pulpwood should be 1.5m×2.0m with 15 years cutting period of return on hilly land of central Hubei Province.