The Variation Rule and Anomaly Features of the Available Precipitation in the Growth Period Of Crops in the Middle and Southern Part of Ningxia

• 作者: CHEN Yu-hua FENG Rui-ping LIANG Xu SUN Yin-chuan ZHANG Zhi
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 作物生长期 月降水量 异常特征 宁夏中部 变化规律 NCEP再分析资料 500hPa高度场 宁夏南部山区
• 年，卷（期）: 2012,（8）
• 页码范围: 49-52
• 页数: 4页
• 分类号: P457.6

摘要

[Objective]The aim was to study the available precipitation and its abnormal characteristics during the growth period of crops in the middle and southern part of Ningxia. [Method] Through Takahashi's evaporation equation,linear trend analysis,Mann - Kendall,Lepage,wavelet analysis,the characteristics of available precipitation and its abnormal characteristics during its growth period in Ningxia were analyzed based on monthly precipitation ( March - September) ,temperature,and NCAR/NCEP reanalysis data in 9 observation stations from 1961 to 2010. [Result] In recent 50 years,the available precipitation during the growth period of crops in central drought area and south hilly area varied a lot,more in the south and less in the north. The available precipitation in these two areas was reducing and varied a lot in different ages. The available precipitation was less in the middle drought region after 1970s and in the southern hilly region after 1990s and the available precipitation in middle drought area changed significantly. The available precipitation in the two areas appeared in July,August,and September,above 76% of general growth period, while that in March,April and May was 14% lower than that in growth period. No abrupt changes in central drought area and south hilly area. There were the periods of 5 -7 a and 2 -3 a oscillations in the middle drought region,2 -3 a and 10 -12 a oscillations in the southern hilly region. There were negative anomaly field at 500hPa height in high-precipitation years between the Baikal and the China's northwestern,and there were positive anomaly field in low-precipitation years. [Conclusion]The study provided reference for the reasonable utilization of available water resources in central and south Ningxia.