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带截距的非线性方程与分段建模方法对立木生物量估计的比较

, PP. 453-457

Keywords: 立木生物量,非线性方程,分段建模,截距,比较,落叶松,马尾松

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Abstract:

针对用单一的非线性模型拟合生物量方程会导致小径阶林木的估计明显有偏的问题,以东北落叶松和南方马尾松的地上生物量数据为例,提出采用带截距的非线性方程和分段建模方法来改进对立木生物量的估计,并对二者的预估效果进行了比较。结果表明:两种方法都能有效克服小径阶林木的有偏估计问题,同时对整个模型的预估效果也有一定程度的改善;从对比分析结果看,分段拟合方程的预估效果还要略好一些。

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