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一、发展旱作物灌溉的必要性1、气候因素安徽省涡阳县地处半湿润季风气候带南部边缘,具有太阳辐射能量丰富,气候温和,雨量比较适中等特点,但降雨时空分布不均,历年旱涝灾害频繁。据县水文站降雨资料,近28年中,作物生长旺盛的4至9月,春涝、初夏涝、夏涝、秋涝共有28次,而春旱、初夏旱、伏旱、夹秋旱为33次,旱多于涝,平均秋旱为2.8年一遇,秋涝则4年一遇,秋旱明显多于秋涝。旱涝的多发性、交替性、连续性和不固定性构成了我县旱涝发生的随机性,给防预旱涝
First, the development of dry irrigated necessity 1, climate factors Guoyang County, Anhui Province is located in the southern margin of semi-humid monsoon climate zone, with solar radiation energy-rich, mild climate, relatively moderate rainfall characteristics, but uneven temporal and spatial distribution of rainfall, Droughts and floods over the years frequent disasters. According to the rainfall data of the county hydrological station, in the past 28 years, the crop grew vigorously from April to September, with spring floods, early summer floods, summer floods and autumn floods totaling 28 times. Spring drought, early summer drought, drought and autumn drought were 33 Times, more drought than waterlogging, the average autumn drought is 2.8 years, the autumn flood is 4 years, the autumn drought was significantly more than the autumn floods. Droughts and floods of multiple, alternating, continuous and not fixed constitute the randomness of drought and flood in our county, to prevent drought