Is There a Light Regime Determined Tree Ideotype
Is There a Light Regime Determined Tree Ideotype
复制标题
是否存在由光照制度决定的树形态
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
I. Impens
中科院分区：
文献类型：
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作者：
S. G. Chen;R. Ceulemans;I. Impens
本文对孤立树冠的光截获进行了理论分析。两种类型的冠，椭球和圆锥，进行了研究。假设树冠是黑体，它揭示了任何窄冠树都存在一个最敏感的太阳高度范围，在该范围内，瞬时光截获最大化。可能的日照时数的角分布的时间和纬度的变化，随之而来的入射直射光能，和不同形状和不同的高度与宽度比的孤立冠截获的光计算。结果进行了比较与建立的假设冠形状作为一种适应当地辐射气候。
Abstract A theoretical analysis of the light interception of isolated tree crowns is presented. Two types of crown, ellipsoid and cone, are studied. Assuming that tree crowns are black bodies it is revealed that for any narrow-crowned tree there exists a most-sensitive solar elevation range at which the momentary light interception is maximized. The temporal and latitudinal variations in angular distribution of possible sunshine hours, the concomitant incoming direct light energy, and the light intercepted by isolated crowns of different shapes and different height to width ratios are computed. The results are compared with established hypotheses on crown shape as an adaptation to local radiation climates.