【摘要】 通过对1970—2009年近40 a临汾市日照时数资料统计,分析了日照时数的年变化、年代际变化、季节变化、月变化趋势,以及日照时数变化对临汾市主要农作物的影响。结果表明,临汾市日照时数的年代际变化和季节变化均呈减少趋势,2009年比1970年减少344 h,倾向率为-9.675 1 h/a;全年总日照时数平均每10 a减少934 h,各季节之间差别较大,春季变化最小,冬季变化最大,1月减少最多。临汾市日照时数的减少对小麦、玉米、棉花的生长都有不利影响。更多还原

【Abstract】 Using the data of sunshine hours in Linfen during 1970-2009,the article analyzed the annual and the seasonal changes trend of sunshine hours and studied the impact on agriculture.The results showed that the annual and seasonal changes of sunshine hours showed a decrease trend.It decreased 344 h in 40 years,the trend rate is-9.675 1 h/a,the total of sunshine hours decreased 934 h per 10 years,there is a big difference among seasons,in spring was minimum and in winter maximum,January was maximum in 12 months.The sunshine hours decreasing in Linfen city showed a negetive effect to wheat,corn and cotton production.更多还原