测定不同砧木嫁接红地球葡萄及自根苗红地球的光合参数日变化，以探讨嫁接亲和性与光合速率的关系。结果表明，亲和性高的嫁接组合红地球+贝达光合速率最高，而亲和性一般的嫁接组合红地球+双优光合速率次之，亲和性弱的嫁接组合红地球+LDP294光合效率最低。4个葡萄嫁接组合的净光合速率日变化均为双峰型，在13:00时出现“光合午休”现象。嫁接葡萄组合红地球+双优、红地球+贝达的水分利用效率高于嫁接组合红地球+LDP294。净光合速率在每天11:00时达到最高峰。

The diurnal change of photosynthetic parameters of Red Globe grape and the graft red globe grapes with different roots were studied in this experiment in order to explore the relationship between grafting affinity and photosynthetic rate. The result showed that the highest photosynthetic rate was observed in the combination of Beta + Red Globe with high affinity， then followed by combination of Shuangyou + Red Globe with general affinity，and the combination of LDP294 + Red Globe showed the lowest rate. The diurnal variation of the net photosynthetic rate in the three grafted grapes showed double peak type because of the photosynthetic midday depression at 13:00 pm. The water use efficiency of Shuangyou + Red Globe and Beta + Red Globe was higher than the combination of LDP294 + Red Globe. The net photosynthetic rate reached the highest peak at 11:00 in one day.

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