风沙流短暂吹袭对樟子松(Pinus sylvestris var. mongolica)幼苗光合蒸腾特性的影响

doi:10.7522/j.issn.1000-694X.2015.00191

摘要/Abstract

摘要： 为了解风沙流短暂吹袭对樟子松（Pinus sylvestris var. mongolica）幼苗光合蒸腾特性的影响，2013年6月在科尔沁沙地测定了0（CK）、6、9、12、15 m·s^-1和18 m·s^-1等6个梯度风速10 min风沙流（风沙流强度分别为0.00、1.00、28.30、63.28、111.82、172.93 g·cm^-1·min^-1）短暂吹袭下樟子松幼苗光合蒸腾速率和水分利用效率等指标的变化。结果表明：（1）短暂的风沙流吹袭对樟子松幼苗蒸腾速率和胞间CO₂浓度的日变化规律影响较小，但可改变其光合速率和气孔导度的日变化规律；（2）15 m·s^-1和18 m·s^-1的强风沙流吹袭可导致其日最大光合速率、蒸腾速率和气孔导度大幅度下降，和CK相比下降幅度分别为22.30%和21.98%、22.87%和22.31%、24.28%和17.45%；（3）短暂的风沙流吹袭可导致其日均光合速率显著降低，日均蒸腾速率和气孔导度波动式下降，日均胞间CO₂浓度波动式增加，和CK相比，15 m·s^-1和18 m·s^-1处理的日均光合速率下降13.26%和11.60%，日均蒸腾速率下降7.93%和8.38%，气孔导度下降1.42%和8.54%，胞间CO₂浓度增加9.07%和3.22%；（4）短暂的风沙流吹袭没有导致其水分利用效率明显变化，但致其光能利用效率显著降低；（5）风沙流胁迫下，其光合速率和蒸腾速率的下降主要受制于气孔导度的降低，其光能利用效率的降低主要源于光合速率和气孔导度的下降。

关键词: 樟子松(Pinus sylvestris var. mongolica)幼苗, 风沙流吹袭, 光合速率, 蒸腾速率, 水分利用效率

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

中图分类号:

Q948.3

赵哈林, 李瑾, 周瑞莲, 云建英, 冯静, 苏娜. 风沙流短暂吹袭对樟子松(Pinus sylvestris var. mongolica)幼苗光合蒸腾特性的影响[J]. 中国沙漠, 2017, 37(2): 254-260.

Zhao Halin, Li Jin, Zhou Ruilian, Yun Jianying, Feng Jing, Su Na. Effects of Brief Sand-drift Wind Blowing on Photosynthesis and Transpiration Properties of Pinus sylvestris var. mongolica Seedlings[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(2): 254-260.

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