1 引言中国西北部如陕西、青海、甘肃、宁夏、内蒙、山西及河北北部等地区长期受干旱影响。旱地农业的研究近年来越来越受到各级研究单位的重视。中国北方马铃薯生产 1 Introduction Northwest China such as Shaanxi, Qinghai, Gansu, Ningxia, Inner Mongolia, Shanxi and northern Hebei have long been affected by drought. In recent years, the research on dryland agriculture has drawn more and more attention from research institutes at all levels. Northern China potato production