摘要
利用江苏省52个气象站1961-2012年逐日降水资料及单季稻产量逐年数据,计算了生育期5-10月的降水分配指数,探讨了降水分配格局的时空变化及与产量的潜在联系。结果表明,江苏省单季稻生育期内降水分配呈现出较强的不均匀性,雨量主要集中于50 mm以上日降水事件和夏季的7月,其中北部地区的降水集中性要明显高于南部地区;近50年来单季稻生育期内降水分配格局的不均匀性呈现加剧态势,突出体现在南部地区50 mm以上降水和8月降水对雨量贡献率的显著增加;单季稻产量与降水分配格局存在着一定的相关性,降水集中性越高对产量越不利,降水分配指数中,以50 mm以上降水的雨量贡献率对产量的负效应最为显著,且南部地区的单季稻产量对这一指标的波动更为敏感。
Based on the data of daily precipitation and single-crop rice yield at 52 meteorological stations in Jiangsu province during 1961 to 2012,the precipitation distribution indices during growing periods from May to October were calculated,and the possible relationship between spatio-temporal variability of precipitation distribution pattern and rice yield was explored. The results showed that,the precipitation distribution during growing periods of single-crop rice in Jiangsu had strong ununiformity,precipitation was mainly concentrated in the daily rainfall events with amount above 50 mm and July of summer,and the precipitation concentration in north Jiangsu was higher than that of south Jiangsu. The precipitation distribution during growing periods of single-crop rice in Jiangsu was intensifying in recent 50 years,and contribution of the rainfall events with amount above 50 mm and the precipitation of August in south Jiangsu had significant increasing trends. There was a certain correlation between precipitation distribution pattern and single-crop rice yield,the higher precipitation concentration would bring the less yield. Among the precipitation distribution indices,the negative impacts of the contribution of rainfall events with amount above 50 mm to yield were more obvious,and single-crop rice yield in south Jiangsu was more sensitive to the variability of the precipitation indicator.
出处
《湖北农业科学》
2018年第3期27-31,共5页
Hubei Agricultural Sciences
基金
公益性行业科研专项(GYHY201506018)
江苏省高校自然科学研究面上项目(16KJB170008)
安徽省科技攻关项目(1501031078)
关键词
单季稻
降水分配指数
江苏省
single-crop rice
precipitation distribution indices
Jiangsu province
