丘陵灌区排水循环灌溉模式节水减排效果研究

邵培寅; 李亚龙; 熊玉江; 袁念念; 苏沛兰

引用本文:	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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丘陵灌区排水循环灌溉模式节水减排效果研究
邵培寅,李亚龙,熊玉江,等
1.太原理工大学水利科学与工程学院;2.长江科学院农业水利研究所

摘要:

【目的】揭示丘陵灌区较为普遍的排水循环灌溉过程及其节水减排效果。【方法】针对灌区典型灌排单元，采用原位试验监测农沟和斗沟中水量和氮磷浓度变化，分析回归率（回归水量/抽灌水量）、负荷削减量、负荷削减率时空变化规律，并通过相关分析、逐步回归方法求解负荷削减率的影响因素。【结果】监测到抽灌-回归过程24次，总回归率为89.93%。生育期总磷、总氮、硝氮和氨氮负荷削减量分别为0.28、3.27、2.35和2.35 kg/hm2。总磷、总氮、氨氮负荷的削减发生在田间和农沟，硝氮负荷的削减发生在斗沟。控排措施使得降雨后排水负荷中的硝氮和氨氮达到了稳定。4种负荷削减率都与浓度之比（回归浓度/抽灌浓度）显著相关，总磷、氨氮削减率与回归率显著相关，总氮、硝氮削减率与抽灌当天及第二天降雨量显著相关，硝氮削减率还与温度显著相关。【结论】抽灌-回归-控排灌溉模式在节水、方便农户灌溉的同时，提高了水肥利用率，降低了排水给下游水体带来的风险，在灌排单元尺度上节水和控污减排效果良好。

关键词: 丘陵灌区；循环灌溉；氮磷负荷；节水灌溉；水稻；控污减排；

DOI：

分类号:S274；S152

基金项目:国家自然科学基金委员会—水利部—中国长江三峡集团有限公司长江水科学研究联合资助(U2040213);清华大学联合开放基金项目(sklhse-2022-Iow09);2021年科技兴蒙项目（2021CG0013）

Study of effects of drainage reuse on water saving and pollutant reduction in hilly irrigated area

shaopeiyin¹, LI Ya-long², xiongyujiang³, yuan nian nian³, SU Pei-lan¹

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

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;