| 摘要: |
| 【目的】分析不同坡向杉木人工林直径分布规律的差异，为调整杉木人工林林分结构提供参考依据。【方法】以福建将乐国有林场杉木人工林为研究对象，利用4种直径分布函数（Weibull分布、Logistic分布、正态分布和Gamma分布函数），分别对幼龄林（8年）、中龄林（16或18年）、成熟林（27年）和不同坡向（阳坡和阴坡）的杉木人工林进行直径结构分析及分布函数的拟合。【结果】总体而言，4种分布函数中，Weibull的适应性最强；杉木幼龄林直径符合Gamma分布；4种分布函数对杉木中龄林直径拟合效果均较好，且中龄林直径以1 cm径阶整化的拟合效果比以2 cm径阶整化的好；4种分布函数对生长于阴坡的杉木成熟林拟合效果不显著，而对生长于阳坡的杉木直径拟合效果较好。【结论】杉木林直径分布较离散；成熟林阴、阳坡直径分布规律差异明显；总体样本规律与个体样本间有显著差异，不分坡向的样本集无法代表该龄组的直径分布规律，应进行坡向对比分析。 |
| 关键词: 直径分布 杉木人工林 坡向效应 分布函数拟合 |
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| 基金项目:中央高校基本科研业务费专项（TD2013-1）；国家自然科学基金项目（41301357） |
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| Effects of slope aspect on diameter distribution of Chinese fir (Cunninghamia lanceolata) plantations |
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HAO Wenqian,CHEN Ling,MEI Guangyi
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| Abstract: |
| 【Objective】This study analyzed and simulated the effects of slope aspect on diameter distribution differences of Chinese fir (Cunninghamia lanceolata) plantations to provide reference for structure adjustment of Chinese fir plantation.【Method】Chinese fir in a state owned forest in Jiangle,Fujian was selected and four diameter classic distribution functions (Weibull,Logistic,Normal and Gamma) were used to analyze diameter structure of Chinese fir plantations with young plantation (8 years),middle-age forest (16 or 18 years),and mature forest (27 years) as well as at different slope aspects (sunny and shady slopes).【Result】Diameter distribution of Chinese fir plantation was generally scattered.Young plantation fit Gamma distribution well.All four distribution functions were good for middle-age class,and the fitting accuracy of 1 cm was higher than that of 2 cm.The fitting accuracy of shady mature forest was not as good as that of sunny slope.【Conclusion】The diameter distribution had significant difference between shady and sunny slopes for mature Chinese fir plantations.Weibull had the highest fitting accuracy among four functions.The distribution pattern for overall sample was significantly different from individual samples,and the diameter distribution of Chinese fir plantations with different age classes cannot be demonstrated by samples without considering slope aspects. |
| Key words: diameter distribution Cunninghamia lanceolata plantation aspect distribution function |
