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- W2024963376 abstract "An empirical model for predicting light levels under a canopy gap in an even-aged oak stand is presented. The effects of gap size, distance from the gap, and directional position (north–south) within the gap on gap light index (GLI) [sensu Canham, C.D. 1988. An index for understory light levels in and around canopy gaps. Ecology 69, 1634–1638] are quantified by multiple regression analysis. Data were obtained by the `erasing method' (Yanagisawa et al., in preparation 1 In order to estimate the light levels after the cutting, hemispherical photographs taken before the actual cutting were computerized and all the crowns to be cut (identified by field observations) were digitally erased (named `erasing method'). Light levels predicted by using the erasing method were highly correlated with that calculated by the ordinary photograph-analyzing method after the actual cutting ( R 2 =0.911, P <0.001). 1 ) which predicts the GLI from computerized images of hemispherical photographs. Forty-five `virtual canopy gaps' were assumed, and at 945 points, light levels were calculated using HEMIPHOT [ter Steege, H. 1993. HEMIPHOT, A Programme to Analyze Vegetation Indices, Light and Light Quality from Hemispherical Photographs. The Tropenbos Foundation, Wageningen, The Netherlands]. The model presented in this study has the advantage that the indices needed for the prediction can be measured easily in field survey. The applicability of the model is discussed." @default.
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- W2024963376 title "An empirical model for predicting the gap light index in an even-aged oak stand" @default.
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