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| Temporal characteristics of runoff-occurrence in rain-fed wheat fields in typical areas of the Tai-lake region, China |
| Received:November 01, 2019 |
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| KeyWord:Tai-lake;rain-fed wheat field;runoff;time characteristics;high-risk period |
| Author Name | Affiliation | E-mail | | YAN Lei | School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
Key Lab of Agro-environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XUE Li-hong | Key Lab of Agro-environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | HOU Peng-fu | Key Lab of Agro-environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | pengfuhou100smby@163.com | | XU De-fu | School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | HE Shi-ying | Key Lab of Agro-environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | YU Ying-liang | Key Lab of Agro-environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | YANG Lin-zhang | Key Lab of Agro-environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| It is important to clarify the characteristics of farmland-runoff to develop a nutrient reduction strategy based on temporal and spatial characteristics. Based on variations in the 60-year historical precipitation sequence and the occurrence of actual field-runoff in the typical area of the Tai-lake basin, this paper analyzes the characteristics of runoff occurring from rain-fed wheat fields. The results showed that in the Tai-lake basin, the annual average rainfall and that during the wheat-growing season were 1 164.8[657.7, 1 643.7] mm and 514.6 mm[207.3, 742.8] mm, respectively. Except for a few years, the annual precipitation anomaly percentage usually changes by ±25% (common). After excluding flood and drought years, the monthly time series of precipitation-probability and daily-precipitation during the wheat growing season, showed a trend of first decreasing and then increasing. The precipitation probability and average daily-precipitation were lowest during December. Based on the statistical results of runoff occurrences during the wheat-growing season over 12 years, the number of runoff occurrences in February (19.05%)and March (18.10%)was relatively high. The proportions of runoff occurrences were approximately equivalent in December (16.19%), April (13.33%), and May (15.24%). The actual range of the minimum precipitation that drives the runoff was 8.1 to 19.4 mm. The results show that the range of the minimum precipitation in rain-fed wheat fields that drives runoff in the Taihu lake region is 8.1 to 19.4 mm. The probability of runoff occurrence in rain-fed wheat fields in the Tai-lake region is not completely consistent with that of precipitation. The months of February and March are the first high-risk runoff periods; December, April, and May are the second-high risk periods. |
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