研究报告

  • 晏维金,李青倩,王芳,王佳宁,余其彪,宋永会,王东升.长江流域磷及“三磷”入河通量及其对干流关键断面磷通量的贡献:模型与情景分析[J].环境科学学报,2022,42(11):149-159

  • 长江流域磷及“三磷”入河通量及其对干流关键断面磷通量的贡献:模型与情景分析
  • Basin-scale phosphorus and “three-P” loads into the river network and their contributions to the riverine P fluxes at key stations of the Changjiang River:Model and scenario analysis
  • 基金项目:国家自然科学基金项目(No.41877483,42077304);长江生态环境保护修复联合研究第一期课题“长江流域水环境模型构建与应用”(No.2019-LHYJ-01-0102)
  • 作者
  • 单位
  • 晏维金
  • 中国科学院地理科学与资源研究所,北京 100101
  • 李青倩
  • 中国科学院地理科学与资源研究所,北京 100101;中国环境科学研究院,北京 100012
  • 王芳
  • 中国科学院地理科学与资源研究所,北京 100101
  • 王佳宁
  • 生态环境部环境规划院,北京 100041
  • 余其彪
  • 中国科学院地理科学与资源研究所,北京 100101
  • 宋永会
  • 中国环境科学研究院,北京 100012
  • 王东升
  • 浙江大学环境与资源学院,杭州 310058
  • 摘要:河流磷含量是河流水质的一个重要指标.全球和区域尺度上河流磷的循环和含量的关系已经被广泛关注,但河流磷的来源及其对河流磷通量的贡献在空间格局上存在巨大的差异.近10年来,长江流域磷矿、磷化工和磷石膏(简称“三磷”)的陆源输入可能是河流磷的重要来源之一,但“三磷”的入河量及其对长江关键断面磷通量的贡献仍然不清楚.本研究基于流域高分辨率(100 m×100 m)的土地利用、磷的生物地球化学收支、河流strahler分级理论、河道截留的“spiraling”理论等,模拟流域陆源磷的入河量、长江关键断面磷输送通量及“三磷”入河量对长江输送磷通量的贡献份额,并将模型结果与长江关键断面连续2年(2016—2017年)的实测结果进行对比验证.结果表明,长江流域2010—2017年多年总磷入河量约为52.0×107 kg,总磷入河模数为(285.19±23.38) kg·km-2·a-1.流域总磷入河量主要受到面源输入和“三磷”输入的控制, 其中,“三磷”入河量从9.23×107 kg增加到26.57×107 kg.长江流域“三磷”入河量存在显著的空间变化,金沙江下游、乌江流域、长江上游地区、岷沱江流域、汉江和长江中游等子流域“三磷”贡献了长江磷输送通量的32.8%,是长江磷的主要来源之一.模型情景分析揭示情景3、4、9减排效果显著且可以实现,建议作为当前长江水环境磷规划管理工作的首要选择.
  • Abstract:Riverine phosphorus (P) content is one of key indexes of water quality. Global and regional riverine P cycle relating to riverine P content is well-established, however, identifying the sources and quantifying the contribution of individual P sources from watersheds to streams and rivers is still not well known. P fluxes from three sources of phosphorus ore, phosphorus chemical industry, phosphogypsum reservoir, so-called “three-P”, are potentially substantial, but the loading and source contribution from three-P are unclear in recent decades. We modeled P loads into the river network, riverine P retention, and riverine P fluxes at key stations by using land use data with high resolution (100 m ×100 m), P biogeochemical budgets, Strahler river model, as well as nutrient “spiraling” theory. We reported results from in-situ measurements of P concentration to characterize P fluxes for two years (2016—2017) in the Changjiang River. These measured data are used to validate the global NEWS-total P biogeochemical model from the eleven sub-basins along the Changjiang River. The average amounts of P loading into the river network are about 52.0×107 kg P, corresponding to (285.19±23.38) kg·km-2·a-1, during the period of 2010 to 2017. We further modeled P loads from “three-P” sources into the river network for source contribution. Our integrated P model simulation demonstrates that three-P loads increased from 9.23×107 kg P in 2010 to 26.57×107 kg P in 2017. The magnitude of “three-P” yields is comparable to yields modeled for agricultural nonpoint source of P across sub-watersheds. These high “three-P” yields constitute an unprecendented non-point source to riverine fluxes. Multi-scenarios analysis suggests that scenarios 3, 4 and 9 are effective and practicable to be recommended as favorable choices in controlling and managing the Changjiang River P pollution.

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