Effect of Alternate Partial Root-Zone Drip Irrigation on Root Morphological Characteristics and Activity of Grape
The research focuses on the effects of different alternate drip irrigation on characteristics,distribution and activity of grape's root,which providing a theoretical basis on designing an efficient alternate irrigation modals of root.With the one year old wine grape (V.vitis L.cv.Cabernet Sauvignon) as material to explore the regularities of distribution in root's diameter,weight,length,surface area,volume and root's change during the irrigation time under three alternate drip irrigation models which include drip irrigation on both sides (T1),subsurface drip irrigation on both sides (T2),drip irrigation on the east side and subsurface drip irrigation on the west side (T3),by installing drip irrigation systems on the east and west of the plant,imitating alternate irrigation of root's sub-zone.Results were as follows:The overall length,total weight,surface area of roots were highest in T3 and lowest in T1,and the west was higher than the east in each treatment;the maximum of root's length in T1 are appeared from 0 to 20 cm of soil depth which accounted for 55％ of root overall length,and 20 to 40 cm deep in T2,which accounted for 49％ of root overall length.The root's regularity of distribution on east in T3 was in accord with T1 and west of it was in accord of T2.The influence with different alternative irrigation on root activity in different soil depth was various;the highest root activity of T1 and T2 distributed in 0 to 20 cm and 20 to 40 cm,respectively;The effect on root activity in T3 on east is similar to T1 while the west is to T2.So the inductive effect on root system's architecture in T2 and T3 was superior to T1,which promote the root plunge into the soil deep,help the root be better-distribute,and maintain the activity of root in a higher level.
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