Light and water have only been discussed in the leaf phenology studies of low latitude tropics, though soil nutrients were also included as potential contributive factors. We investigated the ...relationship between these environmental factors and leaf phenology in the tropical montane forests of Mount Kinabalu, Borneo. Three montane forests of different vegetation were compared during the 1998 El Niño drought in order to differentiate the effect of each environmental factor. As a result, the relationship between soil pulsed nutrient release and leaf flushing was denoted in the forests with an affluent water supply, while water stress suppressed leaf flushing in all vegetation. However, the contribution of light could not be determined. This study is the first to indicate the contribution of soil nutrients to leaf phenology in the tropics.
Light under canopy distributes very heterogeneously point by point and drastically changes day by day in the deciduous broad-leaved forest. We examined spatial and temporal variations of light regime ...and leaf phenology of cool-temperate forest in Gifu, central Japan, in 1999. Leaf phenology was investigated by taking photographs, and shoot sampling method for 9 representative tree species from leaf development stage in spring to leaf fall in autumn. Seasonal light distribution in the forest was measured by film solarimeter method to clarify the relationship between light distribution of understory and leaf phenology of dominant species. As a result, it was found that dates of development and falling of leaves in Betula ermanii and Betula platypkylla var. japonica were several days earlier than those of Quercus crispula. Specific differences in leaf phenology were reflected in light penetration to understory when compared the Betula dominant site and Quercus dominant site, in early spring and late autumn, but no differences were observed after canopy was closed during summer. Thus leaf phenology controls the light regime in the deciduous forest at the periods of leaf development and after falling.
Effects of climatic factors on the plant distribution were examined by means of direct gradient analysis, and the relationship of forest flora, life form and phytogeographical distribution was ...examined. Subsequently, leaf phenology of forest plants were analyzed to evaluate the adaptive significance in relation to the environments in forest understory. In the boreo-nemoral forest ecotone, Hokkaido Island, northern Japan, co-ccurrence of northern and southern plants in a certain forest site is more notable in the understory than in the crown, and this dates back to the late-uaternary period, where the decrease in temperature associated with the glacial period forced the understory flora to adapt their life form or leaf habits to snowcover and light conditions of the interior forests.
Hokkaido University (北海道大学)
博士
環境科学
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