| 彭世彰,徐俊增,丁加丽,李道西.节水灌溉条件下水稻叶气温差变化规律与水分亏缺诊断试验研究[J].水利学报,2006,37(12):1503-1508 |
| 节水灌溉条件下水稻叶气温差变化规律与水分亏缺诊断试验研究 |
| Leaf-air temperature difference of rice and water deficit diagnose under water saving irrigation |
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| DOI： |
| 中文关键词: 节水灌溉 水稻 叶气温差 水分亏缺诊断 |
| 英文关键词: water saving irrigation rice leaf air temperature difference water deficit diagnose |
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| 摘要点击次数: 2026 |
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| 中文摘要: |
| 根据江西示范区的现场试验资料，分析了晚稻叶片叶气温差的日变化、全生育期变化规律及其与土壤水分和空气温度等外界影响因子的相互关系，分析了控制灌溉条件下水稻叶气孔温差对气孔导度、蒸腾速率与光合速率的影响，确定了水稻不同生育阶段光合与蒸腾出现下降的叶气温差临界值。结果表明：水稻叶气温差在不同的土壤水分条件下表现出不同的日变化规律，较低的土壤水分导致了较高的叶气温差；全生育期水稻叶气温差呈上升趋势，并随土壤水分降低而升高，灌水后出现降低；分蘖期、拔节孕穗期和抽穗开花期蒸腾出现下降的水稻叶气温差临界值分别为-0.64℃、0.83℃和1.09℃，生育后期高于生育期前期；分蘖期光合速率下降的临界叶气温差值为0.4℃，拔节孕穗期和抽穗开花期光合速率没有出现明显下降的趋势。 |
| 英文摘要: |
| Based on the field experiment carried out in Jiangxi Province, China, the diurnal variation of the leaf air temperature difference of late rice under control irrigation and its variation law in the whole growing season are analyzed. The relationships between leaf air temperature difference and environmental factors including soil moisture and air temperature were investigated. Furthermore, the i
nfluences of leaf stomatic temperature difference on stomatic conductance, transpiration rate and photosynthesis under controlled irrigation were studied and the leaf air temperature difference thresholds for water deficit diagnose showing reduction of photosynthesis and transpiration in different growing stages were determined. The results show that the diurnal variation of leaf air temperature difference varies under different soil moisture conditions, the low soil moisture results in large leaf air temperature difference. The leaf air temperature difference increases with the growth of rice and varies with the soil moisture and decreases after irrigation or raining. The leaf air temperature
difference thresholds for reduction of transpiration in the period
of tillering, jointing and booting, ear sprouting and blooming are -0.64℃, 0.83℃ and 1.09℃ respectively. For photosynthesis, the temperature difference threshold in the period of tillering is 0.4℃, but the reduction of photosynthesis is insignificant in the period of jointing and booting, ear sprouting and blooming. |
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