Light regime and tree regeneration in scarified sites in forest stands

林分中的光照状况和树木再生

• 批准号: 08660170
• 负责人: SHIBUYA Masato
• 金额: $ 1.41万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660170/
• 关键词: scarified site; light regime; tree; growth rate; seed dispersal; 林分種組成; 光条件

Light regime and stand strucuture of 4 natural stands regenerating on scarified sites in mixed forest stands with various canopy closures were invsetigated in the Uryu and Nakagawa Experimental Forests of Hokkaido University.Light regime was affected by shading from canopy and was spatially heterogeneous, ranging from less than 10% to approximately 100% in RLI,in each site. Light conditon under the canopy was estimated roughly as 15-30% in RLI,and it around the canopy edge as about 40%. RLI on the center of a canopy gap reached to more than 80%.Species composition and structure of a regenerating stand were also affected by canopy distribution. In a canopy gap, pioneer trees such as birches dominated, though late-successional trees such as oak and conifers were mixed with birches or were dominant on occasion under and around the canopy.Therefore, a regenerating stand was composed of small patches of various species composition and structure. Trees with seed dispersed by birds occurred frequently. Height growth decreased with reduced light condition. This tendency was extremely obvious in birch. It is possible that a mixed stand regerates on a scarified site with the canopy of overstory trees.

在北海道大学的Uryu和Nakagawa实验森林中，在混合森林架上的稀缺地点重新生成了4个自然林的光明和林分诱惑，这些林中有各种冠层封闭。冠层下的光孔孔估计在RLI中估计为15-30％，在冠层边缘周围约为40％。冠层间隙中心的RLI达到超过80％。再生支架的种群组成和结构也受冠层分布的影响。在树冠缝隙中，诸如桦树之类的先锋树（例如橡木和针叶树）与桦树混合，或者有时在树冠下和周围占主导地位。鸟类分散种子的树木经常发生。身高生长随着光线状态降低而降低。这种趋势在桦木中非常明显。混合的立式架子可能会在稀缺的地点上带有覆盖物的树冠。