关键词: 新垦蔗地, 土壤水分, 有效性

Abstract: A portable wind tunnel and a Li-6400 system were used to study the effects of different wind velocity (4 and 8 m·s^-1) and blowing duration (0, 30, 60
, 90, and 120 min) on the net photosynthetic rate (P_n), stomatal conductance (G_s), and transpiration rate (T_s) of Zea mays, Triticum aestivum
, Glycine max, and Vigna radiata in Horqin Sandy Land where strong wind in spring often hurts plants. With increasing wind velocity and blowing duration, the P_n and G_s of test crops all had a significant decrease. The P_n and G_s at wind velocity 4 m·s^-1 decreased by 3.3%-74.4% and 10.9%
-51.3%, and at wind velocity 8 m·s^-1 decreased by 30.8%-81.0% and 48.3%-88.0%, respectively, compared with the control. Except for Triticum aestivun, the T_s of the other three crops under wind blowing increased, and the increment was larger at wind velocity 4 m·s^-1 than at 8 m·s^-1. Wind-blowing decreased the water use efficiency of the four crops, and thus, increased the dryness of the crops.

Key words: New-cultivated sugarcane field, Soil water content, Availability