长白山原始阔叶红松林径级结构模拟

以原始阔叶红松林为研究对象,设置了2块1hm2样地,利用Weibull分布函数、负指数函数和q值理论对其林分径级结构进行模拟。结果表明:2块样地林分的径级分布均呈倒"J"形,森林更新良好;Weibull分布函数和负指数函数都取得了较好的模拟效果,但Weibull分布函数更好地预测了大径阶株数,因此,Weibull分布函数比负指数函数更适合原始阔叶红松林径级结构的模拟;2块样地的q值偏小(分别为1.74和1.45),说明径级结构曲线较平缓,大径材数量多。q值法则对于阔叶红松林径阶株数密度的表达效果较好,可以被用于描述阔叶红松林的胸径分布。

Modeling diameter distribution of primary broadleaf-Korean pine mixed forest in Changbai Mountains

Two 1-ha plots were set up in an old-growth broadleaf-Korean pine mixed forest in Changbai Mountains, Northeast China, and the Weibull function, negative exponential function, and constant ratio q were used to model the diameter distribution. In the two plots, the diameter distribution of the trees all exhibited inverse J-shape, which meant that understory regeneration was relatively good. Both Weibull and negative exponential functions were suitable for modeling the diameter distribution in primary broadle...