为研究林分自稀疏线,应用极值统计方法,从现实林分数据出发,通过设计一个阈值,采用广义Pareto模型拟合阈值超出值并进行外推,获得了林分在各个给定径阶下的极限最大株数。利用最大株数与直径关系进行回归分析,得到林分自稀疏线。应用该方法分析了黑龙江省1 511块落叶松人工林固定样地数据,得到黑龙江省落叶松人工林林分自稀疏线,结果与Reineke公式估算结果相一致。
Abstract
Due to the existence of severe interference on real stands, little stands reach its full stocking. Methods from statistics of extreme values were used to study the self-thinning line for larch(Larix olgensis Henry)plantation. After determining a threshold, the generalized Pareto distribution function was used to fit the threshold excesses. The extreme maximum number of stem that a stand can support was abtained. The relationship between the maximum number and diameter revealed the self-thinning line through analysis of regression.Using 1 511 pots data collected from several area of Heilongjiang as an example. The self-thinning line for larch plantation was obtained. Results obtained in this paper were consist with the Reineke equation.
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基金
收稿日期:2013-04-11 修回日期:2014-03-26
基金项目:中央高校基本科研业务费专项资金项目(DL12BA14)
第一作者:邓文平,博士。*通信作者:李凤日,教授。E-mail: fengrili@hotmail.com。
引文格式:邓文平,李凤日. 基于极值理论的落叶松人工林自稀疏线估计[J]. 南京林业大学学报:自然科学版,2014,38(5):11-14.
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