一、基本情况甘肃省东部干旱地区包括固原、海原、西吉、同心、盐池、隆德等县,共有耕地面积九百余万亩。本区的自然特点是雨量极少,年雨量200-300毫米,大部分集中在7、8、9三个月,约占全年雨量的52-85％;冬春多强烈旱风,蒸发量超过降雨量20-104信,春旱严重(见表1);无霜期短,约100-150天;自然灾害众 First, the basic situation Arid areas in eastern Gansu Province, including Guyuan, Haiyuan, Xiji, concentric, Yanchi, Lund and other counties, a total of more than 9 acres of arable land. The natural feature of this area is very little rainfall, annual rainfall 200-300 mm, mostly concentrated in 7,8,9 three months, accounting for 52-85% of the annual rainfall; winter and spring more severe dry wind, evaporation More than rainfall 20-104 letters, severe spring drought (see Table 1); frost-free period is short, about 100-150 days; natural disasters public