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首页> 外文会议>International Symposium on Plant Growth Modeling, Simulation, Visualization and their Applications; 20031013-20031016; Beijing; CN >Influence of Morphometric Characteristics of the Hybrid Walnut Tree (Juglans nigra x Juglans regia) Crown on its Radiative Balance
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Influence of Morphometric Characteristics of the Hybrid Walnut Tree (Juglans nigra x Juglans regia) Crown on its Radiative Balance

机译：核桃树杂种树冠形态特征对其辐射平衡的影响

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The effects of leaf geometry on radiative transfer were examined on four 8-year-old Juglans nigra x Juglans regia trees. The woody architecture of the trees was obtained by in situ 3D digitizing whereas the size and orientation of leaves were determined from a sample. Through the AMAPmod software we could then reconstruct 4 virtual trees used as a support for radiative transfer computation We analysed the influence of (ⅰ) digitizing accuracy, (ⅱ) leaf area, (ⅲ) leaf insertion angle and (ⅳ) leaflet angle on the estimation of intercepted PAR by the canopy and of leaf irradiance. Results showed that the effect of a +- 5 cm digitizing inaccuracy was weak at the canopy scale but could reach 12% of intercepted PAR at the intra-canopy scale. Leaf area was the tested parameter which influenced most intercepted PAR by the canopy. Taking the leaf area distribution into account on the long shoots slightly affected intercepted PAR in our case. Leaf and leaflet inclinations had a more limited effect on the radiative transfers considered at the whole canopy scale but responses varied between the four trees. Our results suggest that leaf and leaflet inclination measured on the real trees optimise intercepted PAR by the canopy although the four trees did not present the same architecture.
机译：在4棵8岁的黑胡桃x胡桃树上检查了叶片几何形状对辐射传递的影响。树木的木质结构是通过原位3D数字化获得的，而叶子的大小和方向则是从样品中确定的。通过AMAPmod软件，我们可以重建4棵虚拟树，用作辐射转移计算的支持。我们分析了（ⅰ）数字化精度，（ⅱ）叶片面积，（ⅲ）叶片插入角度和（ⅳ）小叶角度对叶片的影响。冠层和叶片辐照度对截留PAR的估计。结果表明，在冠层范围内，±5 cm数字化误差的影响较弱，但在冠层范围内，可达到截获的PAR的12％。叶面积是测试参数，该参数影响了冠层截获的大部分PAR。考虑到长枝上的叶面积分布，在我们的案例中，略微影响了截留的PAR。在整个树冠尺度上，叶片和小叶的倾斜度对辐射传递的影响更为有限，但四棵树之间的响应有所不同。我们的结果表明，在实树上测量的叶片和小叶的倾斜度可优化顶篷截留的PAR，尽管这四棵树的结构不同。

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