DIFFERENCE OF PHOTOSYNTHETIC INDEXES AND ANALYSIS OF DROUGHT RESISTANCE OF CHINESE CHESTNUT VARIETIES UNDER SOIL DROUGHT CONDITION

Five chestnut varieties (4 - year - old) were taken as the research materials. And their net photo-synthetic rate (Pn) , water using efficiency ( WUE ) , etc, were determined. The results showed that the daily variation patterns of seven photosynthetic indices such as Pn of the varieties were different, and their daily means were significantly different. Thereafter, drought resistance of the five varieties were analysed. It is concluded that the varieties of Yanhong, Hou84 - 3, Yanshanduanzhi performed highly resistant to drought followed by Dal - 3 and Yanchang.

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