黄土高原半干旱区油松人工林枯落物截留雨量模拟研究

为建立合适的枯落物截留雨量预估模型,利用2008-2011年定位观测数据,采用回归分析方法对黄土高原半干旱区油松人工林枯落物对降雨的截留与林外降雨量(P)、林内穿透雨量(TF)之间的关系进行建模研究;运用Bootstrap方法,对模型进行参数特征分析.结果表明:枯落物截留与林内外降雨量均可用非线性模型Ic=aPb进行回归模拟,回归方程分别为Ic=0.499P0.627和Ic=0.717TF0.513.该模型不仅具有较高的拟合精度,且拟合方程参数稳定性良好,经检验方程均达到显著性要求,可用于预估该区域油松人工林的枯落物截留量.

Litter Interception Simulation of Pinus tabulaeformis Plantation on Loess Plateau

In order to establish the proper model of the litter interception, based on the data deriving from 2008 to 2011, by using regression analysis, the relationship between rainfall (throughfall) and litter interception of Pinus tabulaeformis plantation on the semi-arid Loess Plateau was analyzed, and the regression parameters of the model were determined by Bootstrap. The results showed that both throughfall and litter interception could be analyzed by the nonlinear model I_c=aP^b, which could be exactly presented as I_c=0.499P^0.627 and I_c=0.717T_F^0.513. This model has high fitting accuracy, and the fitting parameters have good stability. The model could meet the requirement for significance.