| Characteristics of energy balance in winter wheat field on the Loess Tableland |
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| DOI：10.7606/j.issn.1000-7601.2017.02.37 |
| Key Words: winter wheat eddy covariance method energy balance latent heat flux sensible heat flux Loess Plateau |
| Author Name | Affiliation | | YUAN Xu | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHU Yuan-jun | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China；Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | LIU Wen-zhao | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China；Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | HAN Xiao-yang | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In this paper, eddy covariance data from a winter wheat field on the Loess Tableland were used to investigate the temporal variation of energy components, as well as the characteristics of energy partitioning and its main controlling factors. Results showed that the total net radiation (Rn) throughout the year was 2.56×103 MJ·m-2·a-1, and the energy balance closure degree was 0.72. In the wintering and grain filling periods, the energy components were dominated by upward sensible heat flux (H), with a maximum value of 7.09 MJ·m-2·d-1 occurring in June. However, in other growing stages and the fallow period, the energy components were dominated by upward latent heat flux (LE), with a maximum value of 10.71 MJ·m-2·d-1 occurring in May. The average of Bowen ratio (β) was 0.57 in growing season and 0.46 in the fallow period. The annual total amount of soil heat flux (G) was -15.26 MJ·m-2·a-1. The daily total amount of soil heat flux (G) reached a maximum value of 1.85 MJ·m-2·d-1 in June, and it was negative from October to the next January, which showed the release of heat from soil. |
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