| 摘要: |
| 【目的】精确量化马尾松树冠因子，为进一步制订马尾松人工林经营模式提供理论依据。【方法】在福建省将乐县国有林场设置27块马尾松人工林标准地，调查相关指标，利用SPSS 20.0软件分析标准去叶枝鲜质量与标准枝的叶鲜质量，树冠轮廓与胸径，材积与冠幅间的相互关系，并构建相应的回归方程。【结果】马尾松人工林以轮生枝数为6的枝条出现的频率最大，轮生枝数为3～8的枝条数量占轮生枝总数的84.946%，其分布近似正态。针对标准去叶枝鲜质量与标准枝的叶鲜质量构建了指数函数，二者呈正相关关系，决定系数为0.901。利用胸径、冠幅和冠长3个林木因子构建了树冠轮廓模型，树冠轮廓随着胸径的增大而增大，在95% 置信区间内，当胸径变化1个单位时，树冠轮廓相应变化39.4%。在分析材积与冠幅相互关系的基础上，构建了材积 冠幅的预测模型，二者呈正相关关系，其决定系数达到了0.853，相关性极显著(P＜0.001)。【结论】所建模型预估精度较高，具有很强的适用性，可以较精确地定量马尾松的树冠因子。 |
| 关键词: 马尾松人工林 树冠 冠幅 冠长 标准枝 |
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| 基金项目:林业公益性行业科研专项“基于林改的森林多功能经营技术研究与示范”(200904003) |
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| Study on crown structure for Masson pine plantation |
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WEI Xiaohui1, SUN Yujun1, HUANG Donghui2
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1.Key Laboratory of Silviculture and Conservation of Ministry of Education,Beijing Forestry University;2.Economic & Technological Development Zone Landscaping and Greening Management Office? of Hebei Qinhuangdao
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| Abstract: |
| 【Objective】The research was to quantify Masson pine crown factor accurately,and to provide scientific reference for the management model of Masson pine plantatation further.【Method】Based on the 27 lump Masson pine plantation plots’investigation data and forest structure data,the experimental sites was set in national forest of Jiangle county Fujian provice.In this paper,SPSS 20.0 was not only applied to analyze the relationships between standard branches fresh mass and leaves fresh mass fitting to standard branches,crown length with crown width and breast height,crown width and volume,but also build the corresponding regression equations.【Result】Number of every ring in Masson pine plantation with the number 6 occurrence frequency is the largest,number 3 to number 8 account for 84.946%,and present approximately normal distribution.According to standard branches fresh mass and leaves fresh mass fitting to standard branches an exponential equation is built,with determination coefficient 0.901.Using three tree factors including diameter at breast height(DBH),crown width(CW)and crown length(CL)to build the crown model,crown outline is increased with diameter at breast,in the 95% confidence interval,the crown outline corresponding change is 39.4%,when diameter at breast height changes one unit.Based on analysing the relationships between crown width and volume,a crown-volume(V)prediction model is built,its correlation coefficient can achieve 0.853,and correlation is significant(P＜0.001).【Conclusion】The model,with a high prediction accuracy and very strong adaptability,could better quantify crown factors of Masson pine accurately. |
| Key words: Masson pine plantation tree crown crown width crown length standard branches |
