Studies On Different Canopy Structures And Photic Effect Of Grapes In Greenhouse

The experiment has contrasted and studied light distribution,photosynthesis, growth and development, anatomical structure of leaves and untramicroscopic structure of antoplasts in different canopy structures both inside and outside the greenhouse .And it has replied that: (1)There are difference because of the different of canopy structure.The light is better both in Arbors horizontal canopy structure inside the greenhouse and in single hedged perpendicular canopy structure outside the greenhouse ,however,the light is worse in single hedged perpendicular canopy structure and doublehedged perpendicular canopy structure inside the greenhouse .Among the different position of various canopy structure , the light distribution is the evenest in Arbors horizontal canopy structure,and the light on the upper levels is better than that of underlayer in either single or double hedged perpendicular canopy structure. (2)The change of one year of Pn in different canopy structures both inside and outside the greenhouse appears in double-peak curve .In sunny day ,the change of one day of the Pn outside the greenhouse appears in three-peak curve,while in cloudy day , the change of one day of the Pn both inside and outside the greenhouse appears in single-peak curve.the Pn inside the greenhouse is lower than that of outside,and the Pn on the upper levels is higher than below in different position of various canopy structures .And the Pn in Arbors horizontal canopy structure is the highest in the greenhouse . (3)The Pn of the leaves of grapes correlatespositivelywiththe relative light intensity greatly. (4)The growth velocity of new shoots inside the greenhouse is higher than outside in different canopy structures.And in greenhouse the growth speed of new shoots in Arbors horizontal canopy structure is lower,while that of new shoots is higher both in single and double hedged perpendicular canopy structure.On the different position of various canopy structures,the growth velocity of new shoots on the under layers is higher than that on the upper layers in the greenhouse.But outside the greenhouse ,that of upper layers is higher than under layers.The Chlorophyll content of every unit area of leaves is lower on the under layers than that on the upper layers .But the Chlorophyll content of every unit weight of leaves is...