摘要：Climate patterns, cropping systems, and agricultural technologies have greater diversity among various regions in China. Knowledge of the spatial–temporal patterns of solar radiation during the maize growing season is essential for farmers and extension technicians in their optimization of cropping choices and development of adaptation strategies for climate change. In this study, based on the observed solar radiation in six subregions of China, we analyzed the spatial distributions and temporal trends of incident solar radiation ( SR i ), beam solar radiation ( SR b ), and diffuse solar radiation ( SR d ) during 1961–2014. From 1961 to 1984, the annual SR i in most areas showed a downward trend, with a median value of −27.8 MJ m −2 year −1 , which is primarily due to a decrease in SR b . However, after 1985, 76% of locations had reversed to brightening. This finding is primarily due to an increase in SR d . The trends in SR i during the whole growing season (WGS) of maize changed by −12.4% to 18.3% during the past 30 years, and 74% of the selected locations showed an increasing trend. At most of the stations, SR b showed a decreasing trend during the WGS, and SR d showed an increasing trend. The trends of SR i , SR b , and SR d during the vegetative period and reproductive period of maize have generally followed a trend similar to the WGSs. Therefore, we conclude that annual solar radiation changed from dimming to brightening from 1961 to 2014 in China. Solar brightening occurred during the maize growing season, which was mainly caused by an increase in diffuse radiation.
关键词：climate change;diffuse solar radiation;maize growing season;solar brightening;solar radiation
