【摘要】 利用陕西渭北地区24个县(市)气象站1971~2000年30年的降水资料和土壤水分观测资料定量分析渭北塬区苹果园土壤水分特征和供耗水规律,计算苹果种植适生区干旱指数,划分水分盈亏分区。渭北旱塬苹果种植区土壤水分具有明显的区域性特征,不同苹果种植类型区域蒸发力和水分盈亏量存在较大差异,渭北旱塬蒸发力为东部果区>北部果区>西部果区>中部果区;渭北旱塬水分盈亏量为东部果区>北部果区>中部果区>西部果区,土壤水分状况以西部果区最好,中部果区次之,北部和东部果区土壤水分状况较差。更多还原

【Abstract】 By using the data of precipitation and soil moisture in 30 years from 1971～2000 from 24 county meteorological stations in Weibei dry plateau of Shaanxi,quantitative analysis is made to find out the characteristics of soil moisture and rules of water supply and consumption in apple orchards of the area,to calculate the drought indexes and to divide the area into different regions according to the content of soil moisture.The results show that the soil moisture of apple-growing area in Weibei plateau has obvious regional characteristics and there are great differences in evaporation and surplus and deficit of soil moisture in different types of apple producing area.As for the evaporation,the order is the eastern part > northern part > western part > central part;and as for the rate of surplus and deficit of soil moisture,the order is eastern part > northern part > central part > western part.The soil moisture condition in the western part is the best,then the central part,while that in the northern part and eastern part is poor.更多还原