袋内小气候对葡萄质量和产量形成的影响

经试验，葡萄果穗套袋后，显著地增大了果穗周围的昼夜温差，有利于果实内碳水化合物的积累。白天虽然袋内温度较高，但由于相对湿度较高，有效地降低果实灼伤；夜间袋内较低的温度和较高的相对湿度，可以减轻葡萄果实的日缩小量。加之套袋后植株结果部位的向下扩展，提高了葡萄的产量。在篱架栽培中，套袋不仅能生产出洁净葡萄，还能使产量提高15％～20％，经济效益提高30％以上。

Effects of Micro-climate in Bags on Quality and Yield of Grapes

The experiment using plastic bags to cover the grape fruit was conducted to determine the effects of micro - climate in bags on quality and yield of grapes. The results showed that the temperature difference between day and night in the bag surroundings had significantly increased. This benefited the assimilation of carbohydrate in the fruits. Although the temperature in the bags was relative higher during daytime, due to the relative higher humidity, the risk of grape fruit injury was effectively reduced. With relative lower temperature and higher humidity in the bags during night, the daily shrink of the fruits was reduced. As the fruiting cane enlarged down to lower parts of the plants, the grape yields had increased. The grape yield in frame planting increased by 15% -20%, and the economic effectiveness increased by more than 30% .