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crown density 郁閉度。

crown derby

According to the law of different forest stand can arise different forest fire , based on the existing forest distribution at the badaling forestry center , the area percentage of different forest types , forest age , crown density and slope for each sub - compartment were analyzed , and based on the different characteristics of each sub - compartment , some rational methods of fire prevention were put forward 摘要本論文基于不同的林分能引起不同的林火特性規律,針對北京八達嶺林場林分狀況,統計分析了各林班不同林分類型、林齡、郁閉度、坡度的面積分布百分比,根據不同林班林分特點,提出了合理的營林防火措施。

Russula subnigricans hongo grows fast after shower in the later summer and early autumn when it was hot . they emerged in the forest stand in which crown density was 0 . 9 or so . soil ph was 5 . 75 , and fagaceae species dominated 每年在夏末秋初高溫陣雨之后為發生盛期。發生地林間郁閉度0 . 9左右,土壤ph值5 . 75 ,其共生樹種以殼斗科為主。

The results showed that plant height , crown breadth , leaf number , leaf breadth and sporophyll number of dryopteris crassirhizoma populations were influenced by forest crown density and light condition 結果表明:林分郁閉度和光照條件顯著影響粗莖鱗毛蕨種群的株高、冠幅、葉片數量、葉片寬度、孢子葉數等形態指標。

Quickly accurate determination method of forest land crown density based on arcview gis 支持下的林地郁閉度的快速精確測定方法