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生态学杂志 ›› 2022, Vol. 41 ›› Issue (6): 1128-1134.doi: 10.13292/j.1000-4890.202206.023

• 研究报告 • 上一篇    下一篇

富铁农田退水对小兴凯湖沉积物磷吸附释放影响

贾雪莹1,田志杰2,张冬杰3,姜明4*,王丽红1   

  1. 1太原师范学院地理科学学院, 山西晋中 030619; 2忻州师范学院, 山西忻州 034000;3滨州学院, 山东省黄河三角洲生态环境重点实验室, 山东滨州 256603;4中国科学院东北地理与农业生态研究所, 中国科学院湿地生态与环境重点实验室, 长春 130102)
  • 出版日期:2022-06-10 发布日期:2022-06-08

Effect of iron-rich farmland drainage on phosphorus adsorption and release in sediments of Xiaoxingkai Lake.

JIA Xue-ying1, TIAN Zhi-jie2, ZHANG Dong-jie3, JIANG Ming4*, WANG Li-hong1   

  1. (1Taiyuan Normal University, Jinzhong 030619, Shanxi, China; 2Xinzhou Teachers University, Xinzhou 034000, Shanxi, China; 3ShandongKey Laboratory of Eco-nvironmental Science for the Yellow River Delta, Binzhou University, Binzhou 256603, Shandong, China; 4Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China).
  • Online:2022-06-10 Published:2022-06-08

摘要: 为探究三江平原富铁农田退水对湖泊富营养化程度的影响,本研究以小兴凯湖作为对象,分析了沉积物磷形态、含量、吸附释放参数及其主要影响因子。结果表明,受农田退水影响,小兴凯湖富营养化程度为中度污染,水利连通性较差且周围为稻田的东北泡子为重度污染。沉积物最大磷吸附容量(Qmax)为29.41~125.00 mg·kg-1,对上覆水磷的吸附较容易,且释放率平均仅为11.73%。沉积物对磷的吸附受环境因子和自身理化性质影响,环境因子中Fe/P和温度对磷吸附呈显著促进作用,pH在5~9范围内波动对沉积物磷吸附的作用较小;沉积物理化性质中粒径组成和无机磷中Fe-P含量影响显著。本研究成果为揭示富铁农田退水影响下湖泊富营养化程度及内源磷释放风险提供了基础数据。

关键词: 铁输入, 沉积物, 磷吸附释放, 小兴凯湖

Abstract: To explore the impacts of ironrich farmland drainage on the eutrophication of lakes in Sanjiang Plain, we analyzed the forms, contents, adsorption and release parameters of phosphorus in sediments and the role of main environmental factors in Xiaoxingkai Lake. Affected by farmland drainage, the eutrophication of Xiaoxingkai Lake was at moderate level. The Dongbeipaozi, which had poor water conservancy connectivity and surrounded by rice fields, was heavily polluted. The phosphorus adsorption capacity (Qmax) of sediments ranged from 29.41 to 125.00 mg·kg-1. Phosphorus in overlying water could be easily adsorbed by sediments, and the average release rate was only 11.73%. The phosphorus adsorption was affected by environmental factors and physicochemical characteristics of sediments. Among the environmental factors, Fe/P and temperature had a significant promotion effect on phosphorus adsorption, and pH in the range of 5-9 had limited effect on phosphorus adsorption of sediments. The particle size composition and Fe-P content in inorganic phosphorus had significant effects on the phosphorus adsorption of sediments. Our results provide basic data for revealing the degree of lake eutrophication and the risk of endogenous phosphorus release under the influence of iron-rich farmland drainage.

 

Key words: iron input, sediment, phosphorus adsorption and release, Xiaoxingkai Lake.