关键词: 西部土壤, 西部土壤, 羊草, 生态化学计量学, 盐碱化草地, 氮磷, pH

Abstract: To reveal the characteristics of the lightning climate in Beijing, the authors adopted the lightning data from 2009 to 2016 probed by ADTD system to analyze lightning parameters characteristics, such as the lightning time distribution, the lightning intensity and the cumulative probability of lightning current amplitude. The results showed that: there were 155567 lightning strikes in this region during 2009-2016, and the negative and positive lightning accounted for 90% and 10% of the total, respectively; compared with the later stage, the total lightning strikes at the previous stage decreased by nearly 30%, but the positive lightning increased by more than 36.1%. Summer is the high incidence season of lightning in Beijing, the number of lightning accounts for about 82.1% in the whole year, which is correspondent to main flood season. The intensity distribution of negative lightning is relatively concentrated, and that of positive lightning is relatively dispersed, the average intensity is -33.9 kA and 63.5 kA, which is enhanced compared with the historical statistical results. The cumulative probability distribution function recommended by the IEEE working group can objectively reflect the distribution characteristics of lightning current amplitude in this area, and the coefficient of determination is higher than 0.99.