关键词: 三阶段DEA, 三阶段DEA, 马铃薯生产, 综合技术效率, 纯技术效率, 规模效率

Abstract: The paper aims to find out the characteristics and relationship of Doppler weather radar echo and cloud-ground lightning in Hunan Province. Based on the lightning positioning system and Doppler weather radar echo images of Hunan Province in 2007, the lightning information and radar echo data were discussed in this paper. The results showed that the time distribution of lightning was obvious and uneven in Hunan Province and its surrounding areas, the peaks occur red in the beginning and ending of June, July and August, with two interval peak values in daily distribution (16:00 to 17:00 pm and 20:00 to 21:00 pm, respectively), and the average daily frequency of lightning activity showed a peak approximately at 17:00. There was a significant correlation between the area and intensity of radar echo and the lightning frequency and intensity, the radar echo area enlarged with the enhancement of the frequency and intensity of lightning. The cloud-to-ground lightning occurred 15 to 30 min before the formation of intensive radar echo center which was bigger than 50 dBz. The position of the lightning and radar echo area had good consistency with each other.