朝阳地区近56年降水趋势分析

目的]分析朝阳地区降水量变化趋势，为当地农业经济发展提供气候依据。方法]假定降水量为连续因子，利用最小二乘法进行一元线性回归拟合。结果]朝阳地区近56年降水量呈下降趋势，年降水总量减少50mm，生长季减少60mm，春季增加10～15mm，降水量减少的主要时段在7～9月份，2000年以后减少最显著。结论]朝阳地区春季降水量的增加可缓解春播期的旱情。7～9月是植物需水关键期，这段时间降水量的减少对植物生长和成熟不利。

Precipitation Trend Analysis of Chaoyang District in Recent 56 Years

Objective] The research was aimed to analyze the trend of precipitation in Chaoyang region and provide the climate basis for the local agricultural economy.Method] Under the assumption that precipitation factors were the continuous,simple linear regression was made by adopting least square method.Result] The precipitation of Chaoyang region showed a downward trend in recent 56 years.The annual precipitation totally reduced 50 mm,and that in the growing season decreased 60 mm,that in spring increased 10 t...