主要测树因子对马尾松产脂量的影响

目的]探讨测树因子对马尾松产脂量的影响。方法]对不同林龄采脂经营的马尾松林分和高产脂林分标准地进行调查及其产脂量测定。结果]胸径对产脂量影响明显,产脂量随着胸径的增大而增大;树高对产脂量的影响没有胸径明显,其对产脂量影响体现在冠高比上,同一林龄,产脂量往往随着冠高比的增加而增大,中龄林保持0.6以上,近熟林保持0.5以上,成、过熟林保持0.4以上的冠高比,可获得较高产脂量。结论]冠高比对产脂量影响是综合作用的结果,胸径和冠高比互补效应十分明显。

Study on the Impact of Main Measure Tree Factors on Resin Yield of Pinus Massoniana

Objective] The study aimed to conduct resin yield under the impact of main measure tree factors from main resin producing areas of southeastern Guangxi province.Method]Based on the measurement of different age stands and high resin yield stands at the plot from resin-tapping P.massoniana forest,and the resting of resin yield.Result] The results showed that diameter at breast height was the important factors on affecting resin yield of P.massoniana stands.The output of the resin increased the volume of the two with the larger diameter at breast height;different age stands,diameter at breast height on the resin production of the impact of varying levels of resin.The impact of the tree height to the resin yield was not so significant as the diameter at breast height,and its impact on the resin yield was indirectly reflected in the live crown high on this factor.In the same age,the output of the resin increased with the increasing of crown height ratio.The crown height ratio was the important factors on affecting resin yield of P.massoniana stands,which of medium-aged forest with 0.6 crown height ratio,of nearly-mature forest with 0.5 crown height ratio and of mature forest with 0.4 crown height ratio could help improve resin production and gain better economic efficiency.Conclusion]The output of the resin was the result of the comprehension.The principle of the mutual impact of breast height and live tree crown height was significant,which effected on the output of the resin in different tree age stands.