Climate Change Research ›› 2012, Vol. 8 ›› Issue (6): 417-425.doi: 10.3969/j.issn.1673-1719.2012.06.005

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Effects of Crop Growth on Hydrological Processes over River Basins and Regional Climate


  • Received:2012-02-16 Revised:2012-04-09 Online:2012-11-30 Published:2012-11-30

Abstract: The regional climate model RegCM3 with the crop model CERES implemented was used to study the effects of crop growth and development on regional climate and hydrological processes over seven river basins of China. A 20-year numerical simulation shows that incorporating the crop growth and development processes improves simulated precipitation over Haihe River basin, Songhua River basin, and Pearl River basin; and compared with the control run RegCM3, the RegCM3_CERES reduces the negative biases of monthly mean 2-m air temperature over most river basins, especially over Haihe River basin and Huaihe River basin in summer. Maximum monthly evapotranspiration is found in summer (JJA) around 100 mm per month in the Yangtze River basin, Haihe River basin, Huaihe River basin and Pearl River basin. The seasonal and annual variations of water balance components (runoff, evapotranspiration, precipitation) over the seven river basins indicate that changes of evapotranspiration are in a good agreement with those of the total precipitation. Compared with the RegCM3, the RegCM3_CERES produces a reduced local water recycling rate over most river basins due to less evapotranspiration and more water flux into these basins; an increased precipitation in the Heihe River basin and Yellow River basin but to different extents a reduced precipitation in the rest river basins; a decline of summer leaf area index (1.20 m2/m2), an increase of root soil moisture (0.01 m3/m3), a decline of latent heat flux (1.34 W/m2, but 16.00 W/m2 in the Sichuan Basin), and an increase of sensible heat flux (2.04 W/m2) over the Yangtze River basin.

Key words: crop growth, regional climate, East Asian monsoon region, hydrological process

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