【摘要】 本文试图从农田水分平衡观点出发,根据作物生长季节的需水量与同期可供水分的关系,建立了一个农业气象学的旱涝指标。更多还原

【Abstract】 The authors have established a formula of drought and flood in agromet-eorolgy from the viewpoint of water-balance in farmland, and analysed the crops require-offering relationship and crops requirement of water (N) , at the same period, that is. K={W+R(1-σ-S) +Q}/NMany parameters of effect have been considered, such as precipitation (R) , moistures of soil in the depth of a metre (W) , surface runoff (a) ,evaporation of under-ground water and moisture in the deep soil (Q) , permeation (S) at the supply of water as the parameters of effect.As the parameters of effect are different in distinctive region and reasons, the parameter K has different formula of simplifying.The authors have established the table of drought-water-logging by experience (Table 5, ) here K is divided into five grades i. e. water-logging, sub-waterlogging, normal, subdrought and drought.Finally, both K anb the real case are compared, it shows that they are approximate.更多还原