【摘要】 以科尔沁地区4种常见作物——玉米(Zea mays)、小麦(Triticum aestivum)、大豆(Glycine max)和绿豆(Vigna radiata)为对象,采用便携式风洞对4种作物幼苗进行不同吹风强度(4和8m.s-1)和吹风时间(0、30、60、90和120min)处理,并利用Li-6400光合作用系统测定作物的净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Ts)的变化,以研究这4种作物幼苗对风胁迫的生理响应。结果表明:4种作物幼苗的Pn和Gs均随着风速的增大和吹风时间的加长而显著降低;在4m.s-1风速下,4种作物的Pn和Gs分别降低了3.3%~74.4%和10.9%~51.3%;在8m.s-1风速下,4种作物的Pn和Gs的降幅分别为30.8%~81.0%和48.3%~88.0%;在吹风条件下,除小麦,其他3种作物的Ts上升,而且在8m.s-1风速处理下的上升幅度均小于在4m.s-1风速下的上升幅度;4种作物幼苗的水分利用效率在不断吹风过程中逐步降低,从而增加了对植物的干燥作用。更多还原

【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(Pn),stomatal conductance(Gs),and transpiration rate(Ts)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 Pn and Gs of test crops all had a significant decrease.The Pn and Gs 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 Ts 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.更多还原