研究报告

  • 何宗健,蔡静静,倪兆奎,黄杨,赵继东,王圣瑞.洱海不同途径氮来源季节性特征及对水体氮贡献[J].环境科学学报,2018,38(5):1939-1948

  • 洱海不同途径氮来源季节性特征及对水体氮贡献
  • Seasonal characteristics of nitrogen sources from different ways and its contribution to water nitrogen in Lake Erhai
  • 基金项目:云南省高原湖泊流域污染过程与管理重点实验室开放基金(No.230200069);万人计划-湖泊沉积物有机磷演变及富营养化影响(No.312232102)
  • 作者
  • 单位
  • 何宗健
  • 南昌大学资源环境与化工学院, 南昌 330031
  • 蔡静静
  • 1. 南昌大学资源环境与化工学院, 南昌 330031;2. 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
  • 倪兆奎
  • 1. 北京师范大学水科学研究院, 北京 100875;2. 云南省高原湖泊流域污染过程与管理重点实验室, 昆明 650034
  • 黄杨
  • 1. 南昌大学资源环境与化工学院, 南昌 330031;2. 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
  • 赵继东
  • 大理白族自治州洱海流域保护局, 大理 671000
  • 王圣瑞
  • 1. 南昌大学资源环境与化工学院, 南昌 330031;2. 北京师范大学水科学研究院, 北京 100875;3. 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012;4. 云南省高原湖泊流域污染过程与管理重点实验室, 昆明 650034
  • 摘要:通过研究2013年入湖河流颗粒物、干湿沉降和表层沉积物氮同位素及变化,试图揭示洱海不同途径入湖氮来源季节性变化特征,并引入Iso Source模型,初步定量估算不同来源氮对洱海水体氮的贡献.结果表明:①洱海主要入湖河流δ15N季节性变化范围为1.5‰~9.1‰.其中,春季氮的主要来源为内源性有机质;夏季和秋季来源主要为土壤流失;冬季的主要来源为生活污水.②干、湿沉降δ15N季节性变化范围分别为+6.86‰~+8.49‰和-10.03‰~-8.15‰,其中湿沉降主要集中在夏秋季节,氮主要来源为机动车尾气和农业土壤释放,而干沉降主要集中在冬春季节,氮主要来源为煤炭燃烧和土壤氮释放.③洱海表层沉积物δ15N的变化范围为3.89‰~6.38‰,北部湖区沉积物氮主要来源为农业化肥,中部湖区主要来源为内源性有机质,南部湖区主要来源为土壤氮.④洱海各入湖氮来源中,废水对水体氮贡献率最大,占比为29%~44%,其次为内源性有机质,占比为24%~31%.此外,土壤氮和化肥也具有一定贡献,占比分别为14%~19%和8%~10%,而其他氮来源的贡献率较低,合计占比小于12%.沿湖区域生活污水排放及湖泊自生内源性有机质共占洱海入湖氮来源的42%~57%,应予以重点关注.
  • Abstract:This study aims to identify the seasonal source of nitrogen (N) in different ways and to calculate the contribution of different N sources on water of Lake Erhai, by using nitrogen isotopes techniques and Iso Source Model. For the inflowing rivers, the primarily source of N was mainly from endogenous organic matters, soil erosion, soil erosion and domestic sewages in the four seasons, respectively. For the wet and dry deposition, wet deposition was concentrated in summer and autumn, and the sources of N were motor vehicle exhaust and release of agricultural soil. Dry deposition was concentrated in winter and spring, and the sources of N were charcoal combustion and soil nitrogen. The source of N in sediment has little difference in the four seasons. The primarily source of N were agricultural fertilizers, endogenous organic matters and soil nitrogen in the northern, central and southern, respectively. Based on the result of contribution of different source of N on Lake Erhai, wastewater was the dominant source of N, accounted for 29%~44%. Endogenous organic matters was the second source of N, accounted for 24%~31%. Furthermore, soil nitrogen and fertilizers accounted for 14%~19% and 8%~10% respectively. Other sources only accounted for 12% or less. Overall, domestic sewage and lake self-endogenous organic matters accounted for 42%~57% of total source of N. Therefore, it should be closely concerned.

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