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一、引言 内蒙古兴安盟地处大兴安岭南麓,多浅山丘陵,年降水量在389.4-476.1mm之间,又由于降水年际变率大,属于典型的半干旱易旱雨养农作区,常有八年一大旱,两年一中旱,四年三轻旱,十年九春旱之说,干旱历来就是困扰当地农业发展的重要因素,严重制约着我盟粮食产量和农业经济的发展和提高。如1989年乌兰浩特年降雨量仅265.5mm,较历年平均少38.3％(其它站偏少23.7-29.1％),由于严重春旱秋吊,造成全盟粮食减产7.2亿斤,减产了42.8％,而
I. INTRODUCTION Inner Mongolia Xing’an League is located in the southern foot of Daxinganling Mountains, more hills, annual precipitation between 389.4-476.1mm, and because of the large interannual variability of precipitation, belonging to a typical semi-arid drought-prone areas, often There have been eight major years of drought, two years of drought, four years of three light drought, ten years of drought in nine, drought has always plagued the development of local agriculture is an important factor that seriously restricts the Union’s food production and agricultural economic development And raise. For example, in 1989, the annual rainfall in Wulanhaote was only 265.5mm, 38.3% less than in previous years (23.7-29.1% less than in other stations). As a result of severe spring drought and falling, the alliance reduced its grain output by 720000000 kg and cut its output by 42.8%