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| Analysis of water balance and runoff pollution in a paddy field with direct seeding cultivation in-situ in the Taihu Lake Basin, China |
| Received:June 30, 2018 |
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| KeyWord:paddy field;evapotranspiration and infiltration;water balance;runoff pollution;export coefficient |
| Author Name | Affiliation | E-mail | | XU Yun-qiang | 1. Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | | | SU Bao-lin | 1. Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | subl@bnu.edu.cn | | WANG Hong-qi | 1. Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | | | QIAO Fei | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | qiaofei@craes.org.cn | | LEI Kun | Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | HE Jing-yi | 1. Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | | | LI Li-fen | 1. Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| In order to accurately and conveniently analyze water balance and non-point source pollution in paddy fields, two research methods were implemented in the experimental paddy field with direct seeding cultivation in the Taihu Lake Basin. The two methods were the "in-situ method based on synchronous observation of precipitation and water depth" (method one) and "identification method of irrigation and runoff based on synchronous observation of precipitation and water depth" (method two). The results obtained were as follows. The total evapotranspiration and infiltration (E+F) loss from the field during the growing period of paddy was 1 087.2 mm, based on the water depth variation data. According to the principle of water balance, the water deficits calculated by methods one and two were 18.1 mm and 81.8 mm, which accounted for 1.4% and 6.0% of the total inflow volume, respectively. Method one was more accurate for water balance analysis. The irrigation volume of the paddy field calculated by method one was 866.9 mm, the total inflow volume was 1 330.6 mm, and the total runoff volume was 303.2 mm. The irrigation volume calculated by method two could be used for comparison with method one. The export coefficients of total nitrogen (TN) and total phosphorus (TP) calculated by method one were 9.18 kg·hm-2 and 0.45 kg·hm-2, respectively, which were within a reasonable range. This indicated that method one could be applied for accurate and reliable water balance and non-point source pollution analyses in paddy fields. |
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