21世纪以来干旱研究的若干新进展与展望
王莺, 张强, 王劲松, 韩兰英, 王素萍, 张良, 姚玉璧, 郝小翠, 王胜

New progress and prospect of drought research since the 21st century
WANG Ying, ZHANG Qiang, WANG Jinsong, HAN Lanying, WANG Suping, ZHANG Liang, YAO Yubi, HAO Xiaocui, WANG Sheng
图2 1960—2011年SPI变化趋势空间分布(引自文献[35])(○、▲分别表示通过99.9%和95%的置信水平)
(a)年,(b)春季,(c)夏季,(d)秋季,(e)冬季
Fig.2 Spatial distributions of the trend of SPI from 1960 to 2011 (cited from literature [35])(○ and ▲ represent passing the confidence level of 99.9% and 95%, respectively)
(a) the whole year, (b) spring, (c) summer, (d) autumn, (e) winter