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利用中国1951-2007年农业受旱面积和播种面积资料,分析了我国农业干旱的空间分布、年际变化特征、长期变化趋势、1979年前后的变化和极端农业干旱分布状况。结果表明,华北、内蒙古和西北东部的平均受旱率高、年际变化小,因此这些地区的农业干旱最严重;东北、内蒙古和西北地区的农业干旱有显著加重的趋势;1979年后除长江中下游局部(安徽和湖北)、河南和福建外,其他地区的农业干旱都在加重,极端农业干旱主要分布在内蒙古、西北东部和华北局部地区。
Based on the data of agricultural drought-affected area and sown area in China from 1951-2007, the spatial distribution, interannual variability, long-term change, the change before and after 1979 and the distribution of extreme agricultural drought in China were analyzed. The results showed that the average drought-resistance rates in North China, Inner Mongolia and the eastern part of Northwest China were high and the interannual variability was small. Therefore, the agricultural aridity in these areas was the most serious. The agricultural drought in the northeast, Inner Mongolia and Northwest China tended to increase significantly. After 1979, In the middle and lower reaches of parts of China (Anhui and Hubei), Henan and Fujian, the agricultural drought in other areas are aggravating. Extreme agricultural droughts are mainly distributed in Inner Mongolia, eastern Northwest China and parts of North China.