期刊
ECOLOGICAL RESEARCH
卷 17, 期 6, 页码 687-693出版社
BLACKWELL PUBLISHING ASIA
DOI: 10.1046/j.1440-1703.2002.00529.x
关键词
hemispherical photography; heterogeneous light conditions; leaf phenology; seasonal change; understory community
类别
In a deciduous broad-leaved forest, we investigated the seasonality and heterogeneity of understory light conditions in relation to the leaf phenology of overstory trees. Fisheye photographs were taken from spring to autumn to estimate direct and indirect light conditions above the understory. Spatial variation in daily direct photosynthetic photon flux density (PPFD) was highest in late May, when the early and the intermediate-flushing trees had finished flushing and the late-flushing trees had just started flushing. After whole canopy closure, spatial variation in direct PPFD became low. Thus, asynchronous overstory leaf flushing in spring resulted in spatial heterogeneity in understory light conditions. These results suggest that the leaf phenological patterns of overstory trees are an important factor in the formation of the understory community.
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