龙陵勐糯柚木人工幼林生长及其模型构建

Growth and Growth Model Construction of Young Teak Plantation in Mengnuo Town,Longling County

为柚木人工林的高效培育提供实践依据和技术支撑,以保山市龙陵县勐糯镇11a生柚木人工林为研究对象,采用树干解析的方法对柚木人工林测树因子各年间变化动态进行了检测,分析了胸径(D)、树高(H)、材积(V)与树龄(T)间的回归关系。结果表明:10和11 a生柚木胸径最高为18.4cm,仍处于速生阶段,年平均和连年生长量曲线相交,表明林分过密,抚育间伐可影响柚木连年生长量;10~11 a时树高生长量下降,而未达数量成熟;材积年平均和连年生长量曲线未相交,且连年生长量曲线位于年平均生长量曲线之上,表明积生长未达数量成熟,此林分处于速生期。但林分密度过大,影响柚木生长,应当对其进行抚育经营。胸径、树高和材积的最优回归模型皆为二次曲线模型。

The growth process of teak plantation in western Yunnan was studied to provide theoretical basis for tending management.Taking the 11-year-old teak plantation in Mengnuo Town,Longling County,Baoshan City as the research object,the dynamic changes of tree measurement factors in different years were detected by using the method of trunk analysis,and the regression relationship between DBH(d),tree height(H),volume(V)and tree age(T)was analyzed.The results showed that the maximum diameter at breast height of 10a and 11a teak was 18.4cm,and it was still in the fast-growing stage.The average annual growth rate and the annual growth curve intersected,indicating that the forest stand was too dense,and tending and thinning could affect the teak annual growth rate;the growth of tree height stagnated significantly at 10a-11a,but the volume did not reach the quantitative maturity;the consecutive annual growth curve was above the annual average growth curve,indicating that the cumulative growth did not reach quantitative maturity,and the stand was in the fast-growing period.If the stand density is too large,it will affect the growth of teak,so it should be tended and managed.The optimal regression models of DBH,tree height and volume are all quadratic curve models.