长岭岗林场日本落叶松人工林适宜经营密度研究
2014-04-29孙拥康汤景明徐红梅林孝培
孙拥康 汤景明 徐红梅 林孝培
摘要:依据湖北省建始县国营长岭岗林场日本落叶松人工林标准地调查资料,研究了胸径、树冠面积、株数的相关关系及规律,结果表明:①日本落叶松人工林树冠面积与胸径最优回归方程为:Y = 2823-0129 4X+0014 9X2;②编制出日本落叶松不同径阶林分理论密度及郁闭度为07~09时的适宜经营密度表;③确定郁闭度08时为研究区最适宜经营密度,并计算出各标准地间伐强度。
关键词:日本落叶松;经营密度;长岭岗林场
中图分类号:S753.3;S791.223文献标识码:A文章编号:1004-3020(2014)03-0017-04
Study on the Suitable Management Density of Larix kaempferi in Changlinggang Forest Farm
Sun Yongkang(1)Tang Jingming(1)Xu Hongmei(1)Lin Xiaopei(2)
(1.Hubei Academy of ForestryWuhan430075; 2.Jianshi County National Changlinggang Forest FarmEnshi445300)
Abstract: Based on the stationary observations of Larix kaempferi plantation in Jianshi County national Changlinggang Forest Farm located in Hubei, the correlation and rule between the diameter at breast height, canopy area and number of trees was studied. The results showed that: ①The fittest model of the canopy area and diameter at breast height of Larix kaempferi plantation was Y = 2.823 0-0.129 4X+0.014 9X2; ②A suitable management density table of Larix kaempferi was charted when the theoretical density and canopy density of Larix kaempferi with different diameter class was between 0.7 and 0.9; ③We confirmed the optimal management density in the study area when the canopy density was 0.8, and calculated the thinning intensity for each sample plot.
Key words:Larix kaempferi;management density;Changlinggang forest farm
合理的林分经营密度,不仅是提高林分质量和生产力,维护森林生态系统稳定的重要生态指标,也是确定合理抚育间伐方式和间伐强度,实现森林可持续经营的关键技术 [1-2 ]。林分经营过程中最优密度管理问题一直都是林业科学研究的热点问题 [3-4 ]。目前,我国学者对于林分合理经营密度的研究,主要采用间伐试验或密度试验 [5-6 ]、遗传算法 [7-8 ]、动态规划法 [9 ]及最优控制理论 [10-11 ]等。采用定性和定量相结合的方法确定林分不同生长阶段合理经营密度,对于指导林业生产实践和科学经营具有重要意义。建始县国营长岭岗林场是我国南方最大的日本落叶松基地 [12 ]。过去,该地区日本落叶松抚育间伐和采伐利用主要借鉴北方经营经验,但南、北方生态环境差异较大,在具体应用中具有一定的局限性 [13 ]。为此,本文以湖北建始县长岭岗林场日本落叶松人工林为研究对象,通过设置并调查不同立地条……
