Controls on methane concentrations and fluxes in streams draining human-dominated landscapes
作者: John T. CrawfordEmily H. Stanley
作者单位: 11 U.S. Geological Survey
23 University of Wisconsin Center for Limnology
刊名: Ecological Applications, 2015
来源数据库: Ecological Society of America
DOI: 10.1890/15-1330.1
原始语种摘要: Streams and rivers are active processors of carbon, leading to significant emissions of CO2 and possibly CH4 to the atmosphere. Patterns and controls of CH4 in fluvial ecosystems remain relatively poorly understood. Furthermore, little is known regarding how major human impacts to fluvial ecosystems may be transforming their role as CH4 producers and emitters. Here, we examine the consequences of two distinct ecosystem changes as a result of human land use: increased nutrient loading (primarily as nitrate), and increased sediment loading and deposition of fine particles in the benthic zone. We did not find support for the hypothesis that enhanced nitrate loading down-regulates methane production via thermodynamic or toxic effects. We did find strong evidence that increased sedimentation...
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  • fluvial 生在河中的
  • methane 甲烷
  • human 人的
  • emissions 排放物
  • loading 加负载
  • sediment 沉积
  • nitrate 硝酸盐
  • diffusive 扩散的
  • draining 排水
  • matter 物质