图2. 1971—2020年广东省不同时间尺度SPEI的Mann-Kendall趋势系数(a、b、c、d、e)和年尺度SPEI年际变化(f)
Fig.2. Mann-Kendall trend coefficients of SPEI at different time scales (a, b, c, d, e) and inter-annual variation of annual scale SPEI (f) in Guangdong Province during 1971-2020