From dimming to brightening during 1961 to 2014 in the maize growing season of China

Food and Energy Security

Xiaoguang Yang¹  Shuang Sun¹  Zhentao Zhang¹  Zhijuan Liu¹  Xiaomao Lin²  Qing Ye³ 

[1] College of Resources and Environmental Sciences China Agricultural University Beijing China;Department of Agronomy Kansas State University Manhattan KS USA;Forestry Institute Jiangxi Agricultural University Nanchang China;

关键词: climate change;    diffuse solar radiation;    maize growing season;    solar brightening;    solar radiation;   

DOI  :  10.1002/fes3.275

来源: DOAJ

【 摘 要 】

Abstract 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 (SRi), beam solar radiation (SRb), and diffuse solar radiation (SRd) during 1961–2014. From 1961 to 1984, the annual SRi 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 SRb. However, after 1985, 76% of locations had reversed to brightening. This finding is primarily due to an increase in SRd. The trends in SRi 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, SRb showed a decreasing trend during the WGS, and SRd showed an increasing trend. The trends of SRi, SRb, and SRd 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.

【 授权许可】

Unknown