| 生物土壤与生态 |
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| Physiological Response to Wind of Some Common Plants in Horqin Sand Land |
| QU Hao1,2, ZHAO Xue-yong1, YUE Guang-yang1,2, WANG Shao-kun1,2 |
| 1.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Wind exerts influence on plant, especially in arid and semiarid regions. In the portable wind tunnel, the net photosynthetic ratio(Pn), stomata conductance(Gs) and transpiration ratio(Ts) of four kinds common plants (Agriophyllum squarrosum, Corispermum macrocarpum, Lespedeza davurica and Digitaria cilliaris) in Horqin Sand Land were measured with a Li-6400 under different air velocities (4 and 8 m·s-1) and blowing duration (20 to 120 min). The results showed that wind made Pn, Gs and Ts decreased significantly with elevated wind levels and blowing duration. At the air velocity of 4 m·s-1, the Pn, Gs and Ts of plants inside the wind tunnel were 47.2%~89.3%, 49.4%~90.1% and 45.7%~86.5% lower than the beginning, respectively. Similarly, Pn, Gs and Ts remained lower as a result of 8 m·s-1 air current, and the decreasing extent was 59.2%~91.3%, 47.3%~93.5% and 69.5%~91.8% respectively. All the indices measured at the air velocity of 8 m·s-1 decreased more than that at the air velocity of 4 m·s-1 except the Gs of Lespedeza davurica. Furthermore, the water use efficiency (WUE) presented evident uptrend at the beginning of wind treatment, suggesting that sand-fixing plants have adaptability to the wind current in short time. However, continuous strong wind current more than 60 min would cause the WUE turning to drop.
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Received: 23 January 2008
Published: 20 July 2009
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2009, Vol. 29 
