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林业科学 ›› 2000, Vol. 36 ›› Issue (zk): 28-35.doi: 10.11707/j.1001-7488.2000S104

• 论文及研究报告 • 上一篇    下一篇

不同密度杉木幼林系统生产力和生态效益研究

方奇   

  1. 中国林业科学研究院林业研究所,北京100091
  • 收稿日期:1998-08-25 修回日期:1900-01-01 出版日期:2001-01-25 发布日期:2001-01-25

STUDY ON PRODUCTIVITY AND ECOLOGIC BENEFITS OF YOUNG GROWTH CHINESE FIR PLANTATIONS SYSTEMS IN DIFFERENT DENSITIES

Fang Qi   

  1. The Research Institute of Forestry, CAF Beijing100091
  • Received:1998-08-25 Revised:1900-01-01 Online:2001-01-25 Published:2001-01-25

摘要:

杉木幼林系统是由4个不同密度级处理系列小区组成,栽植密度分为1665、3330、4995和6660株/hm2(以下分别用A、B、C和D代替)。这些小区土壤质地及地形别无二致,都是用1年生实生苗1987年春天定植。8年生时调查了这些幼林系统林木生长、冠层厚度、枝下高以及生态效益等。随着密度由A增加到D:平均胸径生长量从8.1cm降到6.6cm;平均树高生长量由5.9m降至5.4m;平均冠层厚度自4.9m变薄到3.3m;平均枝下高由1.0m上升到2.3m;这些系统生产力从A到D分别为:4.6、7.3、9.5和10.3t/hm2·a。不同密度系统迳流系数、液体迳流与固体迳流等,在A密度区依次为1.35%、19.4mm/hm2·a和334kg/hm2·a;在B密度区分别是0.52%、8.1mm/ /hm2·a及138kg/hm2·a ;在C密度区先后是0.69%、8.9mm / /hm2·a与1 96kg/hm2·a ;在D密度区顺序为0.75%、11.8mm/ /hm2·a和284kg/hm2·a ,B与C密度区生态效益比较好。最后根据5个项目中15个类目值排序综合评价,得分结果从大到小的次序是:C密度得50分,B密度得43分,D密度得36分,A密度得21分。

关键词: 密度级, 生态效益, 液体迳流, 固体迳流, 经济效益, 生产力

Abstract:

Chinese fir [Cunninghamia lanceolata(Lamb.)Hook.]plantation systems were a series experiment plots consisted of four density treatments: 1665trees/hm2, 3330trees/hm2,4995trees/hm2 and 6660 trees/hm2 (four densities levels are taken place by A,B,C and D). There were not differences in the soil texture and topography of the experimental plots. 1-year-old Chinese fir seedlings were planted in spring of 1987. Tree growth, canopy thickness, tree height under first branch, and ecological benefit of different plantation systems were investigated at 8-year-old of Chinese fir trees. The average DBH increment decreased from 8.1cm to 6.6cm with the increase of plantation density from A to D, at the same time the average tree height increment decreased from 5.9m to 5.4m, the canopy thickness thined from 4.9m to 3.3m, the average tree height under first branch raised from 1.0m to 2.3m. The productivities of different density systems were 4.6, 7.3, 9.5, 10.3t/hm2·a from A to D respectively. The systimatic runoff coefficient, liguid runoff, and solid runoff in the A density region were 1.35%, 19.4 mm/hm2·a, and 334kg/hm2·a respectively, and those in the B density region were 0.52%, 8.1mm/hm2·a, and 138kg/hm2·a respectively, in the C density region were 0.69%, 8.9mm/hm2·a, 196kg/hm2·a respectively, and 0.75%, 11.8mm/hm2·a, 284kg/hm2·a in the D density region respectively. The ecological benefits of B and C density region were better than others. The comprehensive evaluation results based on 5 intems including 15 category values showed that in the score of C density was 50, the score of B density was 43. The score of A density was 36, that of A density was 21.

Key words: Density level, Ecologic benefit, Liquid runoff, Solid runoff, Economic benefit, Productivity