| Cite this article: | 邵培寅,李亚龙,熊玉江,等.丘陵灌区排水循环灌溉模式节水减排效果研究[J].灌溉排水学报,0,():-. |
| shaopeiyin,LI Ya-long,xiongyujiang,et al.丘陵灌区排水循环灌溉模式节水减排效果研究[J].灌溉排水学报,0,():-. |
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| Study of effects of drainage reuse on water saving and pollutant reduction in hilly irrigated area |
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shaopeiyin1, LI Ya-long2, xiongyujiang3, yuan nian nian3, SU Pei-lan1
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1.College of Water Resources Science and Engineering,Taiyuan University of Technology;2.Agricultural Water Conservancy Department,Yangtze River Scientific Research Institute;3.Agricultural Water Conservancy Department，Changjiang River Scientific Research Institute
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| Abstract: |
| Abstract:【Objective】This paper revealed a more common mechanism of water-saving and the characteristics drainage-decreasing of typical irrigation-drainage units in the process of drainage reuse in hilly irrigated area.【Method】In-situ test was used to monitor the water volume and nitrogen and phosphorus concentration of agricultural ditch and bucket ditch in typical irrigation-drainage units. Changes of regression rate (ratio of return water volume to pumping irrigation water volume), nitrogen and phosphorus pollutant load and load reduction rate were calculated and analyzed. The influence factors of load reduction rate were found out through correlations and stepwise regressions.【Result】The pumping-irrigation-regression-drainage process was monitored for 24 times, and the total regression rate was 89.93%. The reduction of total phosphorus, total nitrogen, nitrate nitrogen and ammonia nitrogen loads during the growing period were 0.28, 3.27, 2.35 and 2.35 kg/hm2, respectively. All four load reduction rates were significantly correlated with the concentration ratio (ratio of concentration in regression to concentration in irrigation), as well as total phosphorus and ammonia nitrogen reduction rates were significantly correlated with the regression rate. Total nitrogen and nitrate nitrogen reduction rates were significantly correlated with the rainfall on the day of irrigation and the next day, and nitrate nitrogen reduction rates were also significantly correlated with temperature.【Conclusion】The pumping-irrigation-regression-controlled drainage mode not only saves water and provides convenience for farmers, but also improves the utilization efficiency of water and fertilizer, moreover, reduces the risk of drainage brought to the downstream. This mode has significant positive effects on water-saving and pollution reduction. |
| Key words: Hilly irrigation area; Circular irrigation; Nitrogen and phosphorus load; Water saving irrigation; Rice; Pollution control and emission reduction; |
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