| Popis: |
Based on daily data of 25 meteorological stations in North Xinjiang during 1961-2013, the FAO Penman Monteith equation and crop coefficient method were used to estimate water requirements as well as irrigation water demands of cotton during all growth stages. The results suggested that cotton water requirement in each growth period had been decreasing in the past 53 years. Besides, crop water demand declined most significantly at the blossing and boll forming stage, with change rate of -0.15 mm·a基于北疆25个气象站1961—2013年的气象资料和棉花生育期资料，利用 FAO 推荐的 Penman-Monteith 公式及作物系数法，对棉花各生育阶段的作物需水量和灌溉需水量进行估算.结果表明： 过去53年，北疆地区棉花需水量在各个生育期总体呈下降趋势，其中，花铃期作物需水量下降趋势最为显著，变化率为-0.15 mm·a |
