摘要
详细梳理了近年来黄河营养盐研究成果,总结来水来沙条件改变背景下营养盐输送规律以及与流域建坝的响应关系。结果表明:受黄河上中游植树造林、沿线引黄灌溉和大规模建坝活动影响,黄河入海水沙减少;受黄河流域人类活动影响,黄河N、P、Si营养盐输入发生了显著变化,主要表现为水体DIN逐渐升高,而DIP、DSi含量保持在较低水平,导致入海营养盐比例DIN/DIP和DIN/DSi显著升高,部分水体出现磷限制,从而进一步诱发了河口藻类生态结构改变和赤潮爆发,海洋初级生产力受到限制,并威胁渤海产鱼量。在此基础上提出今后研究应特别关注的领域为:小浪底水库营养盐蓄积与输送研究、新背景下河口近海营养盐扩散规律研究和河口近海生态响应研究。
This paper summarized the data of N,P and Si from the published documents and discussed the inputs of water,sediment and nutrients and the coupling correlation with human damming under the changing hydrological scenarios. The results show that the decreasing trend of water and sediment has been induced by the anthropogenic forestation,irrigation and damming in the upper and middle reaches. N,P and Si inputs are changed obviously due to the anthropogenic activities,and increasing DIN: DIP and DIN: DSi are observed due to the soaring inputs of N and the lowing P and Si. This will lead to the occurrence of P-limitation,constraints of primary production and the subsequent of shifting from normal diatom to toxic species in the biomass structure and the red tide outburst in the Bohai Sea,which will pose a huge threat to the fishery yield. In addition,some fields should be paid more attention,such as dam impoundment effect on the nutrients of Xiaolangdi Reservoir,dispersal patterns under the changing hydrological scenarios and the biological responses in the estuary and offshore areas.
出处
《人民黄河》
CAS
北大核心
2018年第2期81-87,共7页
Yellow River
基金
河南省科技攻关重点项目(152102310093)
关键词
营养盐
生态环境
水沙输送
黄河
nutrients
ecological environment
water and sediment transportation
Yellow River
