Effect of cascade reservoir construction on nitrogen distribution in sediments of Nujiang River and Lancang River
ZHU Xiao-sheng1, GUO Xiao-juan1, WANG Yao-yao1, HE Jin-yan1, YANG Zheng-jian1, JI Dao-bin1, MA Jun2, LIU De-fu2
1. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China;
2. Hubei Key Laboratory of Ecological Restoration of River-lakes and Algal Utilization, Hubei University of Technology, Wuhan 430068, China
In order to investigate the effect of cascade reservoir construction on the distribution of nitrogen forms in sediments, the ion exchangeable nitrogen (IEF-N), the weak acid extractable nitrogen (WAEF-N), the strong alkaline extractable nitrogen (SAEF-N) and the strong oxidant extractable nitrogen (SOEF-N) of sediments were obtained by the sequential extraction method, and were compared to study the distribution characteristics of nitrogen forms in the sediments of Lancang River with cascade reservoir construction and Nujiang River with no hydropower station in the main stream. The main influencing factors of convertible nitrogen were analyzed. The results showed that there were differences in the occurrence environment of sediments between the two basins, and the physical and chemical properties of sediments were obviously different, and the content and spatial distribution of converted nitrogen in sediments were also different. The content of transformed nitrogen in the sediments of Lancang River were greater than that of Nujiang River, and the spatial variation of Lancang River were also greater than that of Nujiang River. The contents of IEF-N, WAEF-N, SAEF-N and SOEF-N in Nujiang River were 1.56~2.55mg/kg and 16.91~46.42mg/kg, respectively. The contents of IEF-N, WAEF-N, SAEF-N and SOEF-N in Lancang River were 1.55~14.35mg/kg, 20.77~83.08mg/kg, 1.36~92.15mg/kg and 562.61~1404.82mg/kg, respectively, and the contents of Lanchang River were 1.55~14.35mg/kg, 1.36~92.15mg/kg, 562.61~1404.82mg/kg, 20.77~8.08mg/kg, 1.36~92.15mg/kg and 562.61~1404.82mg/kg, respectively. The order of convertible nitrogen content between the two rivers were the same, which were SOEF-N>WAEF-N>SAEF-N>IEF-N, Nujiang River and the upper reached of Lancang River. The content and spatial distribution of convertible nitrogen were basically the same, but on the cascade reservoir section of Lancang River, The spatial distribution characteristics of four kinds of converted nitrogen have changed obviously. The main reason for this phenomenon was that the construction of reservoir leads to the change of physical and chemical properties of sediments, total organic carbon and particle size. The effect of redox potential on convertible nitrogen were different.
朱晓声, 郭小娟, 王耀耀, 何金艳, 杨正健, 纪道斌, 马骏, 刘德富. 梯级水库建设对怒江与澜沧江沉积物氮形态分布的影响[J]. 中国环境科学, 2019, 39(7): 2990-2998.
ZHU Xiao-sheng, GUO Xiao-juan, WANG Yao-yao, HE Jin-yan, YANG Zheng-jian, JI Dao-bin, MA Jun, LIU De-fu. Effect of cascade reservoir construction on nitrogen distribution in sediments of Nujiang River and Lancang River. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 2990-2998.
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