恩施地区1950年曾出现过低温多雨的灾年,1980年是继1950年后的第二个灾年,在海拔1,200—1,700米的高山地区,玉米产量受灾严重。如在海拔1,460米的建始县龙坪公社,1980年的玉米产量比1979年减产五成左右。为了弄清楚高山地区玉米减产的原因,我们以本所(龙坪公社许家湾)的玉米试验材料,对比平年(1979年)、灾年(1980年)玉米产量构成因素及其生长发育阶段的 In 1950, the Enshi area had experienced a period of low temperature and rainy weather. In 1980, the second disaster year after 1950, maize production was severely affected in the alpine areas of 1,200-1,700 meters above sea level. For example, at Longping commune, Jianshi County, 1,460 meters above sea level, the maize output in 1980 was about 50% less than in 1979. In order to find out the reasons for the decrease of corn yield in mountainous areas, we compared the corn yield components of the year (1979) and the disaster year (1980) with their corn growth and development stages