摘要
Abstract
The relationship between the decadal change of drought crop area in Gansu and El Nino and La Nino from 1950 to 2000 was comparatively analyzed, the results indicated that: at the year with El Nino event, the drought was very serious in Gansu, the crop area suffering from drought was enlarging, while at the La Nina year, the drought in this area was light, the crop area suffering from drought was small; during 1950 -2000, the maximum crop area affected by drought in Gansu appeared in 1995, while the minimum appeared in 1964, because there were El Nino and La Nina respectively in 1995 and 1964; the closer to the year with strong El Nino events, the larger the crop area suffering from drought in Gansu, and vice versa; the crop area suffering from drought in Gansu Province during 1950 -2000 showed an increasing tendency, the minimum drought crop area appeared in 1950s, while the maximum at 1990s; the drought crop area 1 million hm2 didnt appear in 1950s, while it showed up in 6a of 1990s; at the beginning of each decade, there was highest probability of drought in Gansu Province, which had certain positive significance in drought forecast.关键词
厄尔尼诺/拉尼娜/受旱面积/甘肃省Key words
EI Nino/ La Nina/ Drought area/ Gansu Province分类
农业科技
