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以‘燕山红栗’为试材,以自然圆头形树形为对照,对初果期板栗树进行V字形整形探索性试验,研究V字形树形对板栗光合特性及生长结果的影响。结果表明:V字形树形叶绿素含量略高于对照,差异不显著;2个树形的净光合速率和蒸腾速率日变化趋势基本一致,其中9:00—13:00 V字形树形的净光合速率和蒸腾速率均显著高于自然圆头形;透光率除下-西-2、上-东-1、上-东-2等3个测试点外,V字形树形较自然圆头形高9.58%~89.39%;V字形树体营养生长得到有效控制,产量高于自然圆头形,其中667 m2产量提高8.62%~128.77%,树冠投影面积产量提高10.99%~136.88%。综合来看,V字形树形较自然圆头形受光面积大、光能利用率高,更有利于光合产物的形成与积累,从而有利于产量的提高。
Taking ’Yanshan Hongli’ as test material and natural round-shaped tree as control, V-shaped plasticity exploratory experiment was conducted on early-stage chestnut trees to study the effect of V-shaped tree on photosynthetic characteristics and growth of chestnut. The results showed that: the V-shaped tree chlorophyll content slightly higher than the control, the difference was insignificant; net photosynthetic rate and transpiration rate diurnal variation trends of the two trees were basically the same, including 9: 00-13: 00 V-shaped tree net photosynthesis Rate and transpiration rate were significantly higher than the natural round head shape; light transmittance except the next - West -2, Shang-Dong -1, Shang-Dong-2 and other three test points, the V-shaped tree more natural round head shape The yield of the V-shaped tree was higher than that of the natural round head. The output of 667 m2 increased 8.62% -128.77%, and the crown projected area yield increased by 10.99% -136.88%. Taken together, the V-shaped tree has a larger natural light-receiving area and higher utilization of light energy, which is more conducive to the formation and accumulation of photosynthetic products, which is beneficial to the increase of yield.