低温阴雨对丹东地区粮食作物产量的影响

Effects of Low Temperature and Overcast-Rainy Weather on Crop Yields in Dandong

对丹东地区1978—2015年春季气象资料进行分析,分别从低温、寡照、多雨3个方面研究其对粮食作物造成危害程度的大小,将其划分3个不同的灾害等级。利用拉格朗日插值法计算出作物的期望产量,运用分离法将低温阴雨对粮食作物的损失分离出来,探讨低温阴雨年景与丹东地区粮食作物产量的相关关系。结果表明:(1)丹东地区稻谷、大豆产量都表现出明显的阶段变化。(2)低温型低温阴雨天气对作物的影响为:玉米>大豆>稻谷;寡照型低温阴雨天气对玉米、稻谷、大豆的影响相对较大,影响力为:大豆>玉米>稻谷;多雨型低温阴雨天气对玉米和大豆的影响较稻谷大得多。

The spring meteorological data from 1978 to 2015 in the Dandong area are used to analyze the extent of crop damages, which are divided into three different levels, because of low temperature, overcast or rainy weather, as well as scant lighting. The Lagrange interpolation method is used to calculate the expected crop output, and the separation method is used to separate the yield loss caused by the above mentioned weather. Results show： （1）The yields of rice and soybean in the Dandong region show significant staged changes. （2） The effects of low temperature and rainy weather on crops are ： maize〉 soybean〉rice. The effects of low temperature and scant lighting weather on crops are different： soybean〉 maize〉rice. In addition, the influence of rainy and cold rainy weather on corn and soybean is much larger than that on rice.