冠层分析仪在苹果树冠结构光学特性方面的研究

冠层结构光学特性研究在森林和农田生态领域应用较多,而在果树上涉及很少。运用WinsCano-py2004a冠层分析仪对陕西渭北8个县110棵苹果树的冠层结构光学特性进行了测定。结果表明,渭北地区苹果树冠层的特征指标中,间隙指数、开度、叶面积指数与冠层光合有效辐射通量和定点因子有显著相关性,并且不同树体间差别很大,表明间隙指数、开度、叶面积指数等对于果树冠层的光截获能力影响较大,而平均叶角和聚集因子等指标与冠层光合有效辐射通量和定点因子无明显相关性且不同树体间相差不大,表明叶分配角和平均叶角等对于冠层光截获无明显影响;初步认为Wins Canopy2004a冠层分析仪可用在苹果树冠层结构分析方面,合理进行苹果树冠结构及光学特性的评价。

The Characteristic of Light Distribution in Apple Tree Canopy Using WinsCanopy2004a

Research on the characteristic of light distribution in the canopy structure were applied widely in the forest and cropland ecology,but seldom in fruit tree. The digital characteristic of light distribution in 110 apple tree''s canopy of 8 counties in Weibei areas of Shaanxi province were determined by WinsCanopy2004a for Hemispherical Image Analysis Instruments. The results showed that Gap Fraction,Openness and LAI have a significant relationships with PPFD and Site Factor,but it''s different among the tree samples,means Gap Fraction,Openness,LAI have significant influence on light interception by apple tree''s canopy. LAD,MLA and Clump Fact has no relationship with PPFD and Site Factor,also has little difference among the tree samples,LAD and MLA doesn''t have significant influence on light interception by apple tree''s canopy. It was considered that WinsCanopy2004a for Hemispherical Image Analysis Instruments can be used to analyze the structure of apple canopy.