Abstract: In order to understand effects of brief sand-drift wind on photosynthesis and transpiration properties of Pinus sylvestris var. mongolica saplings, a field wind blowing experiment with a gradient of wind speed (0, 6, 9, 12, 15, 18 m·s^-1)and sand-drift wind intensities (0.00, 1.00, 28.30, 63.28, 111.82, 172.93 g·cm^-1·min^-1)was conducted in June, 2013 in the Horqin Sand Land of Inner Mongolia. The results showed that: (1) brief sand-drift wind blowing had a lesser effects to diurnal variation pattern of Tr and C_i of P. sylvestris var. mongolica seedlings, but could change its diurnal variation pattern of P_n and G_s; (2) Strong sand-drift wind blowing with 15 m·s^-1 and 18 m·s^-1 wind speed resulted in a great decrease of the daily maximum P_n, Tr and G_s, which decreased by 22.30% and 21.98%, 22.87% and 22.31%、24.28% and 17.45%, respectively, compared to the CK; (3) with increase of sand-drift wind intensity, daily average P_n, Tr and G_s tended to decrease and daily average C_i tended to increased, which decreased by 13.26% and 11.60% in the P_n, 7.93% and 8.38% in the Tr and 1.42% and 8.54% in the G_s, increased by 9.07% and 3.22% in the C_i, respectively, in the 15 m·s^-1 and 18 m·s^-1 treatments compared to the CK; (4) brief sand-drift wind blowing did not resulted in significant changes to WUE of the seedlings, but resulted in a significant decrease of the light energy utilization efficiency; (5) in the sand-drift wind stress, the decrease of the P_n and Tr resulted mainly from decrease of the G_s, the decrease of the light energy utilization efficiency resulted mainly from decrease of the P_n and G_s.

Key words: Pinus sylvestnis var. mongolica seedlings, sand-drift wind blowing, P_n, Tr, WUE