不同林龄杉木胸径树高与冠幅的通径分析
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摘要
为了解杉木林分不同发育阶段冠幅因子的变化规律,以及胸径和树高对冠幅因子的影响程度,运用通径分析方法分析了福建将乐林场5种杉木纯林中胸径和树高与冠幅因子之间的关系。结果表明:1)冠幅的增长主要是在中龄到接近成熟这个阶段,冠幅范围主要在0.3~1.8 m;2)杉木林发育不同阶段的冠高率分布在区间0.3~0.9,总平均冠高率为0.50;3)胸径对冠幅具有显著的正向作用,且随着林分的发育,正向作用逐渐增强,树高只在幼龄和过熟阶段对冠幅起正面作用;4)胸径与树高对冠形率均具有显著的负作用,其中,对冠形率起显著作用的主要是树高,这种负作用在近熟林时最小,成熟林时最大。
We studied growth law of crown in different ages,and impact degree between diameter at breast height( DBH),tree height and crown by path analysis. Crown width grew mainly from immature to near-mature,and the figure was in 0. 3-1.8 m. Crown ratio distributed in 0. 3-0. 9,and average crown ratio was 0. 5. DBH had a significant positive effect to crown with the development of forest stand,and the positive effect was gradually enhanced. Tree height played a positive influence at young forest and over-matures forest. There was a remarkable negative effect between DBH,tree height and crown shape ratio,and the main factor is tree height. The negative effect was minimum in near-mature forest and maximum in mature forest.
We studied growth law of crown in different ages,and impact degree between diameter at breast height( DBH),tree height and crown by path analysis. Crown width grew mainly from immature to near-mature,and the figure was in 0. 3-1.8 m. Crown ratio distributed in 0. 3-0. 9,and average crown ratio was 0. 5. DBH had a significant positive effect to crown with the development of forest stand,and the positive effect was gradually enhanced. Tree height played a positive influence at young forest and over-matures forest. There was a remarkable negative effect between DBH,tree height and crown shape ratio,and the main factor is tree height. The negative effect was minimum in near-mature forest and maximum in mature forest.
引文
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[15]张琪,丛鹏,彭励.通径分析在Excel和SPSS中的实现[J].农业网络信息,2007(3):109-110.
[16]赵德海,刘强,杨小军,等.安福县杉木人工林合理采伐年龄的确定[J].林业科技开发,1993(2):2-4.
[17]古育平.用材林经济成熟龄的计算及分析[J].华东森林经理,1989,3(1):19-26.
[2]张金文.巨尾桉大径材间伐试验研究[J].林业科学研究,2008,21(4):464-468.
[3]Biging G S,Dobbertin M.A comparison of distance-dependent competition measures for height and basal area growth of individual conifer trees[J].Forest Science,1992,38(3):695-720.
[4]Monserud R A,Sterba H.A basal area increment model for individual trees growing in even-and uneven-aged forest stands in Austria[J].Forest Ecology and Management,1996,80(1/3):57-80.
[5]雷相东,张泽路,陈晓光.长白落叶松等几个树种冠幅预测模型的研究[J].北京林业大学学报,2006,28(6):75-79.
[6]冯益明,李增元,张旭.基于高空间分辨率影像的林分冠幅估计[J].林业科学,2006,42(5):110-113.
[7]符利勇,孙华.基于混合效应模型的杉木单木冠幅预测模型[J].林业科学,2013,49(8):65-74.
[8]Gill S J,Biging G S,Murphy E C.Modeling conifer tree crown radius and estimating canopy cover[J].Forest Ecology and Management,2000,126(3):405-416.
[9]邓宝忠,王素玲,李庆君.红松阔叶人工天然混交林主要树种胸径与冠幅的相关分析[J].防护林科技,2003,57(4):19-21.
[10]符利勇,孙华,张会儒,等.不同郁闭度下胸高直径对杉木冠幅特征因子的影响[J].生态学报,2013,33(8):2434-2443.
[11]田晓筠.林木直径与冠幅的灰色模型及应用[J].科技资讯,2008(25):86.
[12]刘广深,徐冬梅,许忠坚,等.用通径分析法研究土壤水解酶活性与土壤性质的关系[J].土壤学报,2003,4(5):756-762.
[13]杜家菊,陈志伟.使用SPSS线性回归实现通径分析的方法[J].生物学通报,2010,45(2):4-6.
[14]Sewall Wright.Correlation and causation[J].Journal of Agricultural Research,1921,7(3):557-584.
[15]张琪,丛鹏,彭励.通径分析在Excel和SPSS中的实现[J].农业网络信息,2007(3):109-110.
[16]赵德海,刘强,杨小军,等.安福县杉木人工林合理采伐年龄的确定[J].林业科技开发,1993(2):2-4.
[17]古育平.用材林经济成熟龄的计算及分析[J].华东森林经理,1989,3(1):19-26.