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在中国农业大学昌平实验站定点定位测定了充分灌溉、前期胁迫后期充分灌溉、前期充灌后期胁迫、全生育期胁迫4种灌溉处理下旱稻品种HD 297不同生育期内光合蒸腾等农田生理生态特征。结果表明:旱稻的光合速率日变化规律为,在旱稻生长前期,日变化曲线呈现“双峰”趋势,在作物生长后期,曲线呈现“单峰”变化趋势;旱稻的蒸腾速率日变化规律则在全生育期内均呈现“单峰”变化趋势,与温度日变化规律一致;旱稻的水分利用效率日变化规律呈“L”型,6∶00最高,随后急剧下降,到18∶00达到最低值。不同的灌溉处理只影响作物光合、蒸腾和水分利用效率值的大小,不改变其变化趋势。在4个灌溉处理中,前期胁迫后期充分灌水的处理产量水平的水分利用效率最高。
The physiological and ecological characteristics of farmland, such as photosynthesis and transpiration, at different growth stages under four irrigation treatments, including full irrigation, pre-priming period, pre-priming stage and pre-priming stage, were determined by site-specific mapping at Changping Experimental Station, China Agricultural University . The results showed that the diurnal variation of photosynthetic rate in upland rice was “double peak” trend in the early stage of Upland rice growth and “unimodal” trend in late growth stage. The diurnal variation of transpiration rate in upland rice was in the During the whole growth period, the trend of “single peak” showed the same trend with the diurnal variation of temperature. The diurnal variation of water use efficiency of upland rice was “L”, the highest was at 6:00, then decreased sharply and reached the lowest at 18:00 . Different irrigation treatments only affect crop photosynthesis, transpiration and water use efficiency values, and do not change the trend. Among the four irrigation treatments, the highest water use efficiency was obtained at the treatment output level after full irrigation in the early stage of pre-stress.