摘要
北方旱地区域农田水分特征的主要影响因子是自然降水和农田蒸散量。在区域尺度上 ,农田潜在蒸散量是半干旱偏旱区 >半湿润偏旱区 >半干旱区。半干旱偏旱区农田水分平均潜在亏缺量为 5 17mm,最大亏缺量为 96 8mm,最小亏缺量为 16 2 mm。半干旱区旱地农田水分平均潜在亏缺、最大亏缺和最小亏缺量分别为 2 74、6 88和 - 34mm,半湿润偏旱区上述 3个参数分别为 15 7、4 6 9和 - 180 m m。由于降水的时空变化 ,不同类型地区农田土壤水分储存量也产生了区域分异 ,3种不同类型地区农田土壤水分在农作物不同发育期储存量的变化是半湿润偏旱区 >半干旱区 >半干旱偏旱区。
The soil moisture characteristics of dry land field in Northern China are affected by precipitation and evaportranspiration. The field evaportranspiration in semiarid and arid zone is the largest, that in semi humidity arid zone the middle, and that in semiarid zone the smallest. The average water deficit amount is about 517 mm in dry semiarid zone, the maximum value 968 mm,the minimum value 162 mm; And in semiarid zone, the average value, the maximum value and the minimum value are 274, 688 and -34 mm, respectively; in semihumid arid zone, the 3 parameters are 157, 469 and -180 mm, respectively. Due to the temporal and spatial variation of precipitation, the deposited amount of soil water has their spatial, temporal variation too in 3 different zones, and their values in crop growth season are semihumid arid zone is the largest, that in semiarid zone the middle, and that in semiarid dry zone the smallest. The crop water use is from precipitation and soil water before sowing.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2002年第3期11-14,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家"十五"科技攻关项目 (2 0 0 1BA5 0 9B0 9)
国家自然科学基金重大项目 (3 98993 70 )
农业部 2 0 0 1国债项目资助
