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The Rs in China showed a significant decline trend (-1.1 Wm-2 per decade) during 1970-2015. A decreasing trend (-2.8 Wm-2 per decade) in Rs during 1970-1992 was observed, followed by a recovery trend (0.23 Wm-2 per decade) during 1992-2015. The recovery trends at individual stations were found at 233 out of 454 stations during 1970-2015, which were mainly located in southern and northern China. The new Rs dataset would substantially provide basic data for the related studies in agriculture, ecology, and meteorology.Chitosan is used in va