纳板河流域不同森林类型林分直径分布结构特征研究
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摘要
在纳板河流域的5种森林类型中设置大样地14块,采用负指数函数模型和q值分布函数,研究不同森林类型的林分直径分布结构特征,以此探究纳板河流域森林群落的生长状况。结果表明,整个流域中的森林群落拟合模型均表现出近似双曲线形式中的局部反"J"型曲线形式,大量林木直径分布在10径阶,不同森林群落的负指数拟合效果较好,其中拟合效果最好的为季风常绿阔叶林。从a值、k值、q值的测算结果得出森林群落次生能力由强到弱的顺序为热带雨林群落、热带季雨林群落、季风常绿阔叶林群落、山地雨林群落、落叶阔叶林群落。
The 14 sample plots were set up in five forest stands in Nabanhe basin to investigate the diameter distribution structure of different forest types by the distribution function of q value and the model of negative exponential function to study the growth status of forest communities. The results showed that the forest community fitting model in the whole basin presented the local inverse "J" curve form similar to hyperbolic form with a large number of trees of 10 cm in diameter, and the negative index fitting effect of different forest communities was good, among which the monsoon evergreen broad-leaved forest had the best fitting effect. It can be concluded by the values of A,K and Q that the order of secondary capacity of forest community from strong to weak was tropical rainforest community,tropical monsoon forest community,monsoon evergreen broad-leaved forest community,mountain rainforest community and deciduous broad-leaved forest community.
The 14 sample plots were set up in five forest stands in Nabanhe basin to investigate the diameter distribution structure of different forest types by the distribution function of q value and the model of negative exponential function to study the growth status of forest communities. The results showed that the forest community fitting model in the whole basin presented the local inverse "J" curve form similar to hyperbolic form with a large number of trees of 10 cm in diameter, and the negative index fitting effect of different forest communities was good, among which the monsoon evergreen broad-leaved forest had the best fitting effect. It can be concluded by the values of A,K and Q that the order of secondary capacity of forest community from strong to weak was tropical rainforest community,tropical monsoon forest community,monsoon evergreen broad-leaved forest community,mountain rainforest community and deciduous broad-leaved forest community.
引文
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[3] 胡文力.长白山过伐林区云冷杉针阔混交林林分结构的研究[D].北京:北京林业大学,2003:1-66.
[4] 李梦,仲崇淇,李元,等.长白落叶松人工林直径分布模型的研究[J].南京林业大学学报,1998,22(1):57-60.
[5] 舒洪岚,徐素芬.樟树苗期直径结构分布的研究[J].江西林业科技,2004(5):4-6.
[6] 吕勇,李卫兵,王才喜,等.黄丰桥林场杉木林分直径的结构特征[J].中南林学院学报,2002,22(2):44-47.
[7] 惠淑荣,吕永震.分布函数在林分直径结构预测模型中的应用研究[J].北华大学学报,2003,4(2):101-104.
[8] 张文,高天雷.马尾松林分直径结构研究[J].四川林勘设计,2001(2):26-30.
[9] 许彦红,杨宇明,杜凡,等.西双版纳热带雨林群落林分直径结构研究[J].西南林学院学报,2004,24(2):16-18.