ABSTRACT
Briefly, in northern China, especially north China and northeast China, spring drought and springsummer persistent drought occur most frequently, followed by summer drought, and spring-summerautumn persistent drought occurs with the lowest frequency. In south China, autumn-winter drought and winter-spring drought occur most frequently, autumn-winter-spring persistent drought occurs only in isolated years, and summer drought occurs with
Table 24.1 Drought intensity
Duration of drought
Moderate drought (%)
Severe drought (%)
Extreme drought (%)
One month Two months Three months Four months Five months More than six months
<-80 -51 ~ -80 -26 ~ -50 -1 ~ -25
<-80 -51 ~ -80 -26 ~ -50 -1 ~ -25
<-80 -51 ~ -80 -26 ~ -50 -1 ~ -25
Source: Li et al. 1996
the lowest frequency. In the Middle and Lower Reaches of the Yangtze River basin, summer-autumn drought occurs most frequently, especially summer-autumn persistent drought, and spring drought occurs less frequently.
