生态与农村环境学报 ›› 2023, Vol. 39 ›› Issue (12): 1547-1558.doi: 10.19741/j.issn.1673-4831.2023.0607

• 区域环境与发展 • 上一篇    下一篇

乌鲁木齐及周边区域河道沉积物氮磷赋存形态特征及污染评价

粟文豪1, 朱新萍1,2, 王灵1,3, 雷荣荣3, 韩天伦4, 汪龙眠4, 孔明4   

  1. 1. 新疆农业大学资源与环境学院, 新疆 乌鲁木齐 830052;
    2. 北京农学院生物与资源环境学院/农业农村部华北都市农业重点实验室, 北京 102206;
    3. 新疆天熙环保科技有限公司, 新疆 乌鲁木齐 830000;
    4. 生态环境部南京环境科学研究所, 江苏 南京 210008
  • 收稿日期:2023-06-07 出版日期:2023-12-25 发布日期:2023-12-27
  • 通讯作者: 朱新萍,E-mail:zhuxinping1978@163.com;王灵,E-mail:42216412@qq.com E-mail:zhuxinping1978@163.com;42216412@qq.com
  • 作者简介:粟文豪(1999-),男,重庆巫溪人,主要研究方向为河道沉积物氮磷污染释放及控制。E-mail:suwenhao202109@163.com
  • 基金资助:
    新疆维吾尔自治区科技支疆项目计划(2022E02026);新疆农业大学研究生校级科研创新计划(XJAUGRI2023049)

Characteristics and Pollution Assessment of Nitrogen and Phosphorus Fractions in River Sediments in Urumqi and Surrounding Areas

SU Wen-hao1, ZHU Xin-ping1,2, WANG Ling1,3, LEI Rong-rong3, HAN Tian-lun4, WANG Long-mian4, KONG Ming4   

  1. 1. College of Resources and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China;
    2. College of Bioscience and Resource Environment, Beijing University of Agriculture/Key Laboratory of Urban Agriculture (North China), Ministry of Agriculture and Rural Affairs, Beijing 102206, China;
    3. Xinjiang Tianxi Environmental Protection Technology Co. Ltd., Urumqi 830000, China;
    4. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210008, China
  • Received:2023-06-07 Online:2023-12-25 Published:2023-12-27

摘要: 为了阐明乌鲁木齐及周边区域河道沉积物中氮磷的赋存特征及其潜在的生态风险性,在乌鲁木齐及周边区域选取5条典型河道,共布设 15 个采样点,分析沉积物理化性质、氮磷含量以及赋存形态,并进行沉积物氮磷污染风险评价。结果表明,沉积物中总氮和总磷含量范围分别为 1 699.23~3 702.93 和 596.65~1 729.53 mg·kg-1,平均含量分别为 2 799.40和 994.82 mg·kg-1。沉积物中可转化态氮的主要形态为强氧化剂浸取态氮(SOEF-N)和弱酸可浸取态氮(WAEF-N),占可转化态氮(TTN)的比例分别为 43.94%和 40.42%。沉积物中无机磷的主要形态为钙结合态磷(HCl-P)和残渣态磷(Res-P),占总磷的比例分别为58.94%和14.94%;生物有效磷(BAP)的平均含量为 134.92 mg·kg-1,占总磷的比例为 12.48%。沉积物中有机磷的主要形态为富里酸结合态有机磷(Fulvic-OP)和盐酸可浸提态有机磷(HCl-OP),占有机磷的比例分别为 34.38%和 32.95%。冗余分析表明,总磷含量、pH值、Fe2O3含量是影响河道沉积物氮磷形态的3个主要环境因子。综合污染指数法评价表明,河道沉积物中总磷、总氮的综合污染程度均为中度或重度。研究结果可为西北干旱区城市河道水环境治理和河道管理提供基础数据与科学依据。

关键词: 河流沉积物, 氮形态, 磷形态, 生物有效磷

Abstract: In Urumqi and surrounding areas, 5 typical river channels were selected, with 3 sampling points (a total of 15 sampling points) set up for each channel to collect sediment samples. By measuring the physical and chemical properties, nitrogen and phosphorus content, and fractions of river sediments, and evaluating the ecological risk of nitrogen and phosphorus pollution levels in river sediment, so as to reveal the distribution characteristics of nitrogen and phosphorus content and fractions in river sediments and their potential ecological risks. The results show that the total nitrogen contents of the sediments were between 1 699.23 and 3 702.93 mg·kg-1 (the average content was 2 799.40 mg·kg-1), and the total phosphorus contents were between 596.65 to 1 729.53 mg·kg-1 (the average content was 994.82 mg·kg-1). The main fractions of transformable nitrogen (TTN) in the sediment were strong oxidant leachable nitrogen (SOEF-N) and weak acid leachable nitrogen (WAEF-N), accounting for 43.94% and 40.42% of TTN, respectively. The main phosphorus fractions of inorganic phosphorus in the sediments were calcium-bound phosphorus (HCl-P) and residual phosphorus (Res-P), accounting for 58.94% and 14.94% of total phosphorus (TP), respectively. The average content of bioavailable phosphorus (BAP) was 134.92 mg·kg-1, accounting for 12.48% of TP. The main fractions of organic phosphorus in the sediment were fulvic acid-bound organic phosphorus (Fulvic-OP) and hydrochloric acid-leachable organic phosphorus (HCl-OP), accounting for 34.38% and 32.95% of organic phosphorus, respectively. According to Redundancy analysis, TP content, pH, and Fe2O3 content were the main factors affecting the distribution characteristics of nitrogen and phosphorus fractions in river sediments. The comprehensive pollution index method evaluation show that the comprehensive pollution degrees of TP and TN in the river sediments were moderate or severe. The results can provide basic data and scientific basis for urban river water environment management and river administration in the northwest arid region of China.

Key words: river sediment, nitrogen fractions, phosphorus fractions, bioavailable phosphorus

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