高纺锤形苹果树三维重建和光照特性的评价

以13a生"富士"树为试材,应用三维数字化仪和Piaf Digit软件对高纺锤形"富士"的大、中、小冠层进行数字化,树体模型及光截获的计算均在Vege STAR软件中实现。光截获效率用STAR值来表征。实测的透光率与模型计算出的值无显著差异,表明基于三维数字化仪的重建模型可以用来进行冠层光照特性的评价,以对冠层结构进行量化与定性分析。结果表明:大、中、小冠层的光截获量依次增大,而5种枝条类型中,长营养枝的STAR值最大,果台枝最小;果实的STAR值与果台枝和短营养枝、长营养枝和短果台副梢的光截获量有关。由三维模型构建得出的STAR值可以作为评价冠层光截获的指标,为后期树体冠层内光合作用的研究及整形修剪提供了理论参考。

Three-dimensional Reconstruction of Trees Trained to Tall Spindle Shape and Assessment of Light Characteristics

Taking 13-year-old ’Fuji’ trees as test materials,three-dimensional digitizer and Piaf Digit software were used to digitize the large,middle and small canopy of trees trained to tall spindle shape.The tree model and computation of light interception,which was characterized as STAR were realized in the VegeSTAR software.Light transmittance derived from the model had no significant difference from what we measured.The constructed model could be used to assess the light characteristics.The test was to make quantitative and qualitative analysis of the canopy structure.The results showed that the STAR of VL were the largest and the bourse were that of the smallest in five type of shoots;the STAR of fruits related to light interception of bourse,VS,VL and BS.The STAR value could be used as an indicator to assess the canopy light interception,which provided a theory reference for the research on the photosynthetic and pruning and training in the later period.