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采用FAO56推荐的方法计算了江苏省高邮灌区1955~2007年的水稻灌溉需水量,并通过Mann-Kendall检验对其长期变化趋势进行分析,结合气象因素的变化趋势,分析了气候变化对高邮灌区水稻灌溉需水量的影响.结果表明,由于气温上升和相对湿度下降,在过去的50余年中高邮灌区水稻生育期的参考作物腾发量呈显著上升趋势,在降雨基本无变化的情况下,灌溉需水量有上升的趋势.在不减少灌区水稻种植面积的条件下,应通过节水措施减少水量损失和提高水分利用效率,尽可能地满足灌溉需水要求,降低气候变化对水稻生产的影响.研究结果可为提高水稻灌溉管理水平、应对气候变化的策略研究提供理论依据.
According to the method recommended by FAO56, the irrigation water requirement of rice in Gaoyou irrigation area of Jiangsu Province from 1955 to 2007 was calculated, and its long-term trend was analyzed by Mann-Kendall test. Combined with the change trend of meteorological factors, The results showed that the reference crop evapotranspiration during rice growth in the past 50 years in the past 50 years showed a significant upward trend due to the increase of temperature and relative humidity. Under the condition of basically no change in rainfall, the need for irrigation The amount of water is on the rise.In the condition of reducing rice acreage in irrigated area, water saving measures should be adopted to reduce water loss and improve water use efficiency to meet irrigation water demand as much as possible and to reduce the impact of climate change on rice production.Research The results can provide theoretical basis for improving the irrigation management level of rice and studying the strategy of climate change.