Alleviating Effects of Different Shelter Heights on Heat Damage of'Kyoho'Grapevine
In order to effectively alleviate the damage of high temperature stress on grape plants and fruits,and provide a basis for the improvement of rain shelter facilities in major grape producing areas in China.The leaf curtain layer and soil temperature,leaf chlorophyll fluorescence parameters,tree viger and yield of perennial'Kyoho'grapevine were investigated before and after shoulder raising(shoulder height was 1.6 m and 2 m,respectively).The results showed that at 12:00 and 15:00,the canopy temperature in high-shed was significantly lower than that in low-shed.The temperature of 10 cm soil layer after 12:00 was higher in low-shed than in high-shed,and the maximum temperature difference occured at 15:00.During the day from 6:00 to 18:00,Fv/Fm in low-shed were lower than those in high-shed,with a significant difference observed at 12:00 and 15:00.Fv/Fm of leaves in low-shed was 97.32% to 98.90% of that at 6:00,respectively.The flower bud rate in high-shed was significantly higher than that in low-shed by 7.86 percentage points.In the high and low sheds,65.78% and 44.21% of'Kyoho'grapevine with D≤2 mm roots were distributed in 10-30 cm soil layer,respectively.The test results showed that compared with low rain shelter with a shoulder height of 1.6 meters,the rain shelter with a shoulder height of 2.0 m was more conducive to alleviating the damage of high temperature stress to'Kyoho'grapevine.
Kyohoheat damagechlorophyll fluorescenceflower bud rateroot distribution
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