张晓彤, 张红梅, 吴念, 宋国栋, 丁帅, 刘素美. 黄河中下游干流及水库系统营养盐变化研究[J]. 海洋环境科学, 2023, 42(5): 653-661. DOI: 10.12111/j.mes.2022-x-0290
引用本文: 张晓彤, 张红梅, 吴念, 宋国栋, 丁帅, 刘素美. 黄河中下游干流及水库系统营养盐变化研究[J]. 海洋环境科学, 2023, 42(5): 653-661. DOI: 10.12111/j.mes.2022-x-0290
ZHANG Xiaotong, ZHANG Hongmei, WU Nian, SONG Guodong, DING Shuai, LIU Sumei. Study on nutrient variation in mainstream and reservoir system of the middle and lower Yellow River[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(5): 653-661. DOI: 10.12111/j.mes.2022-x-0290
Citation: ZHANG Xiaotong, ZHANG Hongmei, WU Nian, SONG Guodong, DING Shuai, LIU Sumei. Study on nutrient variation in mainstream and reservoir system of the middle and lower Yellow River[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(5): 653-661. DOI: 10.12111/j.mes.2022-x-0290

黄河中下游干流及水库系统营养盐变化研究

Study on nutrient variation in mainstream and reservoir system of the middle and lower Yellow River

  • 摘要: 为研究黄河中下游干流及三门峡和小浪底库区表层水体中营养盐的浓度与组成结构,以及水库对营养盐输送通量的释放与截留效应,本文于2017年6月在黄河中下游及三门峡与小浪底水库进行了采样。结果表明,小浪底库区内NO3、溶解无机氮和总溶解态氮平均浓度略低于黄河干流其他站位,各形态溶解态磷和溶解态硅仅为其他站位的41%~60%,但溶解有机氮在库区明显升高,平均浓度达到了其他站位的1.2倍。溶解无机态营养盐浓度在小浪底库尾(远离大坝)降低,而溶解有机态营养盐浓度增加,可能是浮游植物生长繁殖所造成的。库首(靠近大坝)段溶解无机态营养盐浓度增加而有机态营养盐浓度降低,一方面可能是有机质降解等成为了溶解无机态营养盐的来源;另一方面,对氮来说还可能存在硝化作用,而硅则可能由生物硅的溶解产生。小浪底水库内溶解有机态营养盐所占比例更高,且氮磷硅比值相对干流更加不均衡,但2017年未实施调水调沙,正好避免了小浪底水库中这种营养盐结构显著不均衡的水体短时大量下泄,降低了下游、河口及邻近渤海海域发生富营养化的潜在可能性。此外,本次调查中,三门峡和小浪底水库在黄河营养盐输送中的作用并不相同。三门峡水库对营养盐出库通量产生了截留效应,小浪底水库对下游营养盐的输运产生了释放效应,且与三门峡出库通量相比,其释放量提高了127%~438%。

     

    Abstract: To study the concentration and composition of nutrients in surface water of the middle and lower reaches of the Yellow River as well as the release or retention effects of Sanmenxia and Xiaolangdi reservoir on nutrient transport, sampling was carried out in the middle and lower reaches of the Yellow River and Xiaolangdi reservoir in June 2017. The results show that in the mainstream of the Yellow River, the average NO3, dissolved inorganic nitrogen (DIN) and total dissolved nitrogen in the Xiaolangdi reservoir were slightly lower than other stations, and the dissolved phosphorus and dissolved silicon (DSi) were only 41%~60% of other stations, but dissolved organic nitrogen (DON) was significantly increased in the reservoir and the average concentration was 1.2 times of other stations. The concentration of DIN decreased in the tail of the Xiaolangdi reservoir (away from the dam) while the concentration of DON increased, which may be caused by the growth and reproduction of phytoplankton. The concentrations of dissolved inorganic nutrient increased while the concentrations of dissolved organic nutrient decreased in the head of the reservoir (near the dam), which may be caused by the degradation of organic matter, as well as the nitrification of nitrogen (for NO3) and the dissolution of biogenic Si particles (for DSi). The proportion of dissolved organic nutrients in Xiaolangdi reservoir was higher, and the ratio of nitrogen, phosphorus and silicon was more unbalanced than that of the mainstream, but the lack of water and sediment regulation event in 2017 prevented the large-scale discharge of the significantly unbalanced water body of Xiaolangdi reservoir in the short term, reducing the potential possibility of eutrophication in the downstream, estuary and Bohai Sea. In addition, Sanmenxia and Xiaolangdi reservoir played different roles in nutrient transportation in this investigation, Sanmenxia reservoir had an interception effect on outflow flux, while Xiaolangdi reservoir had a release effect on the transportation of downstream nutrients, and it had increased by 127%~438% compared with the outflow flux of Sanmenxia.

     

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