模拟降雨量下微集水种植对玉米光合速率及水分利用效率的影响

Effect of Water micro-collecting planting on corn(Zea mays L.) photosynthesis rate and water use efficiency under simulated rainfall conditions

利用人工模拟降雨装置,设置平作和垄作两种种植方式,以平作为对照组,研究了玉米在垄沟集雨下光合特性和水分利用效率的变化。结果表明,在230 mm3、40 mm的降雨量下,沟垄集雨种植玉米的光合速率显著高于对照组,分别提高了41.1%和10.5%,在440 mm的降雨量下,两者的差异不显著;在3个雨量下,沟垄集雨种植玉米的叶片瞬时水分利用效率比对照组均有提高,分别提高了20.5%、18.9%和10.7%;沟垄集雨种植玉米和对照组的光合速率日变化均呈"单峰型"曲线,对照组水分利用效率在230 mm、340 mm降雨量下呈"单峰型"曲线,在440 mm降雨量下呈现逐渐下降的趋势,沟垄集雨种植的玉米水分利用效率均呈"单峰型"曲线。

Photosynthesis characteristics and water use efficiency（WUE） were studied in different stimulated rainfall. The results showed that the photosynthesis rate （Pn） of micro-collecting planting treatments was higher in comparing with the control condition under 230 mm and 340 mm rainfall, increased by 41.1% and 10.5 % separately. But there was no significant difference between micro-collecting planting and the control condition under 440 mm. And the WUE of micro-collecting planting treatments in comparing with the control condition was higher under 230 mm,340 mm and 440 mm rainfall, increased by 20.5 %, 18.9 % and 10.7 % separately. The results also showed that the diurnal change curve of Pn was a single peak charact in micro-collecting planting treatments and the control condition. The diurnal change of WUE was a single peak curve under 230 mm and 340 mm rainfall, but was a downward tendency under 440 mm in the control condition. In micro-collecting planting, the diurnal change of WUE was a single peak curve.