Differential Overstory Leaf Flushing Contributes to the Formation of a Patchy Understory

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概要

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• Understory individuals were found to form patches in a 100-year-old deciduous broad-leaved forest. The closed forest canopy was uniform, and so the light conditions at various locations across the forest floor differed little after the leaf flush of the overstory. To explain the distribution pattern in the understory, a hypothesis was proposed: in spring, the forest floor is divided into patches according to the timing of leaf flosh of the overstory individuals, and the light conditions are more favorable for understory plants under the crowns of trees with later-flushing leaves. In the plot, three groups of early, intermediate, and late, were recognized in the overstory concerning the timing of leaf flush. As for the start of leaf flush, a difference of 31.6 days was recognized among tree species, and for the end of leaf flush, a diffcrcnce of 40.3 days. In the spring of 1998, the relative photosynthetic-photon-flux density under an intensively studicd Castanea crenata tree (late-flushing species) usually showed higher values than that under a similarly studied Acer mono tree (early-flushing species). Analysis of the spatial-distribution pattern using Morisita's l_δ index revealed that the understory community had an aggregated distribution. In the overstory, the late-and the intermediate-flushing-species groups showed aggregated distributions,while the early-flushing group showed random distribution. Spatial correlation between the understory and the overstory was analyzed by using Morisita's R_δ index. The distribution of whole understory community spatially co-occurred with that of the late-flushing-species group of the overstory. In contrast, the understory community was less developed below the members of the early-flushing-species group of the overstory. We consider that the data presented here support our hypothesis, and we suggest that the growth and survival of understory individuals were promoted in the places receiving for long periods in spring.

• 一般社団法人日本森林学会の論文
• 2001-08-16

著者

• KOMIYAMA Akira

  Faculty of Agriculture, Gifu University

• KATO Shogo

  Faculty of Agriculture, Gifu University

• KOMIYAMA Akira

  United Graduate School of Agricultural Science, Gifu University

• Komiyama A

  Faculty Of Agriculture Gifu University

• Kato Shogo

  Faculty Of Agriculture Gifu University

• Kato S

  Faculty Of Agriculture Gifu University

• Teranishi Miki

  Faculty of Agriculture, Gifu University

• Teranishi Miki

  Faculty Of Agriculture Gifu University:agriculture And Forestry Office Shizuoka Prefecture

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