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燕山山地东西段白桦天然次生林直径结构规律的研究

标题: 燕山山地东西段白桦天然次生林直径结构规律的研究
英文标题: A study on diameter distribution structure of birch in natural secondary forests in Yanshan mountainous regions
作者: 王典娜,纪晓林,刘英华,黄选瑞,程旭
出版时间: 2013-01-01
机构: 河北农业大学
关键词: 燕山山地,白桦,直径结构,规律
英文关键词: Yanshan mountain,birch,diameter structure,discipline
刊名: 河北林果研究
英文刊名: Hebei Journal of Forestry and Orchard Research
ISSN: 1007-4961
卷号: 001
基金: ^A科技部"十二五"项目^B2012BAD22B0304^D1
页码: 17-22
分类号: S792.153
摘要: 林分直径分布是林分结构的主要特征,合理的林分结构是充分发挥森林功效的基础.本试验以河北省.孟滦林场、黑龙山林场白桦天然次生林为研究对象,分析白桦幼龄林、中龄林和近熟林林分直径结构规律,用正态分布、对数正态分布、Weibull分布以及Logistic分布模型分别进行拟合.结果表明:孟滦林场和黑龙山林场白桦幼龄林直径分布均呈反"J"型曲线,符合对数正态分布;孟滦林场白桦中龄林直径结构呈单峰山状分布,符合正态分布、对数正态分布以及Logistic分布.而黑龙山林场白桦中龄林直径分布呈反"J"型,符合对数正态分布;白桦近熟林在孟滦林场中其直径结构呈双峰山状分布,Wemull分布拟合效果最好,而在黑龙山林场中,白桦近熟林直径分布呈多峰山状分布,weibull分布拟合效果最好.
英文摘要: Stand diameter distribution is the main feature of the stand structure, and reasona- ble stand structure is the foundation for it to give full play of the forest efficacy. In this stud- y, the natural secondary forests of birch at Mengluan and Heilongshan forest centres were selected as the research materials, and the diameter distribution patterns of young forest stands, half-mature forest stands and near-mature forest stands were analyzed and fitted u- sing the normal distribution, lognormal, Weibull distribution and the Logistic distribution models. The results showed that the young stands both at Mengluan and Heilongshan forest centres showed a reversed "J" curve in diameter distribution, which was fitted to the lognor- mal distribution. The half-mature stands at Mengluan forest centre showed a single peak shape in diameter distribution, which was fitted with normal distribution, logarithmic nor- mal distribution and Logistic distribution. As for the half-mature stands at Henglongshan center, a reversed "J" type in diameter distribution was observed, which was fitted to the lognormal distribution. The near-mature stands at Mengluan center showed a double-peak shape in diameter distribution, which fitted the best in Weibull distribution However for the near-mature ones at Henglongshan forest center, a multimodal pattern in diameter distri- bution was observed, which fitted Weibull distribution best.