Mianyang Normal University, Mianyang, Sichuan 621000, China;Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China 在期刊界中查找 在百度中查找 在本站中查找
Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;Xian University of Technology, Xian, Shaanxi 710048, China 在期刊界中查找 在百度中查找 在本站中查找
[Objective] Studying the ecological ditch interception for reducing nitrogen and phosphorus in water source area of Hanjiang River in order to provide reference and basis for agricultural non-point source pollution control. [Methods] Ditch water of different sections was monitored at different times of rain events to study the intercept effectiveness of nitrogen and phosphorus. [Results] Nitrogen concentration was more greatly influenced by extraneous water from the ditch side than that of phosphorus at the same section. The variance coefficients of TN and NO3-N concentrations were 19.81%~42.81%, 9.57%~16.73% and 32.14%~42.81% at the upstream, middle and lower section, respectively. The variance coefficients of NH4+-N and TP were 33.33%~88.46% at four sections. Aquatic plant interception decreased the nitrogen and phosphorus concentrations by 9.52%~31.11%. [Conclusion] Ecological ditch can intercept nitrogen obviously. Meanwhile, some sand interception projects should be arranged appropriately for controlling phosphorus loss.
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