A dataset of diffuse radiation in Qianyanzhou Ecological Research Station (2012–2019)

<p indent="0mm">Diffuse radiation is one of the main components of solar radiation. The photosynthetically active radiation in it is the main driving force of plant photosynthesis, whose dynamic change has an important effect on ecosystem carbon cycle. In 2012, an SPN1 pyranometer (Delta-T Devices Ltd., UK) was installed in the comprehensive meteorological observation field in Qianyanzhou Ecological Research Station to measure the diffuse radiation. For the missing diffuse radiation data, we replaced them with the data measured by the CMP11 pyranometer (Kipp &amp; Zonen, Netherlands) attached with a shadow ring. If the diffuse radiation data of CMP11 pyranometer were also missing, we used the verified Reindl model in Qianyanzhou area for calculation. The accuracy of this dataset is on a 30-minute scale, and the time range is from 2012 to 2019. Long-term high temporal resolution data are valuable for understanding the characteristics of atmospheric radiation and its temporal variation in key typical agricultural regions in China. The dataset can also be used as important auxiliary data for the research on time scale issues involving atmosphere, agriculture and ecology.