V形水平和V形下垂叶幕对香百川葡萄光能利用的影响

Effects of V shape with horizontal canopy and pendulous canopy on the light energy utilization of‘Chambourcin’grape

为比较V形水平叶幕和V形下垂叶幕对香百川葡萄光能截获和利用的影响,测定2种叶幕类型下叶绿素含量、生长季的叶片光合能力、叶面积及光能和光谱截获率。结果表明,与V形水平叶幕相比,V形下垂叶幕显著提高了4~20节位叶片的叶绿素含量,提高了4~16节位叶片的叶面积,提高了叶幕投影范围内的光能截留率和400~800 nm波长范围的光谱截获率。下垂叶幕放缓了中上部节位叶片发育速度,生长前期下垂叶幕12~16节位叶片光合能力低于水平叶幕,随后光合能力迅速提高,至花后14周6~16节位叶片的净光合速率显著高于水平叶幕。

In order to compare the effects of HC(V shape with horizontal canopy)and PC(V shape with pendulous canopy)on the light energy utilization of‘Chambourcin’grapes.The chlorophyll content,photosynthetic capacity,leaf area,light and spectral interception rate were measured.The results showed that compared with HC,pendulous canopy significantly increased the leaf chlorophyll content of the 4~20 nodes,increased the leaf area of 4~16 nodes,improved the light energy interception and 400~800 nm wavelength interception.The pendulous canopy decreased the development speed of leaves above 12 nodes,the leaf net photosynthetic rate of the 12~16 nodes at 4 weeks after flowering is lower than that of horizontal canopy,while the leaf net photosynthetic rate of the 12~16 nodes significantly increased as time prolonged under pendulous canopy treatment,and the leaf net photosynthetic rate of the 6~16 nodes at 14 weeks after flowering is significantly higher than that of horizontal canopy.