Scholarlink

<p>Surface waters including streams and rivers play a critical role in global carbon and nitrogen cycling, including the production and emission of the greenhouse gases (GHGs) carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>), and nitrous oxide (N<sub>2</sub>O). Although many studies have investigated patterns in GHG concentrations, spatial and temporal drivers of these concentrations remain poorly understood. This study explores variation in dissolved GHG concentrations and their key chemical drivers across four streams with contrasting hydraulic conditions and nutrient availability in a coastal, temperate, suburbanized watershed. We use a nine-year dataset of weekly, year-round measurements of dissolved GHGs and stream physical–chemical variables. Structural equation modeling revealed distinct drivers of GHG concentrations with temperature, dissolved oxygen (DO), dissolved organic carbon (DOC), nitrate (NO<sub>3</sub><sup>−</sup>), and stream discharge (Q) all being identified as important predictor variables. The magnitude and directionality of the relationship between each GHG and predictor variable varied across sites and seasons. Methane peaked in warmer months and N<sub>2</sub>O in cooler months, attributable to changes in temperature and DO. Relationships between N<sub>2</sub>O, DO, and temperature suggest predominance of denitrification as a pathway for N<sub>2</sub>O production. Results underscore the interplay of biogeochemical processes in driving GHG concentrations within river networks and the importance of long-term, four-season datasets to fully characterize spatial and temporal variability in temperate ecosystems and diverse river systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Strong Spatial and Seasonal Variation in Dissolved Greenhouse Gases is Driven by Stream Chemistry and Temperature Across a Coastal Suburban River Network

  • 期刊论文

  • 发表日期：

    2025年11月17日

查看全文
  • Clarisse Ishimwe,
  • Allison M. Herreid,
  • Jody D. Potter,
  • William H. McDowell,
  • Adam S. Wymore

摘要

Surface waters including streams and rivers play a critical role in global carbon and nitrogen cycling, including the production and emission of the greenhouse gases (GHGs) carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Although many studies have investigated patterns in GHG concentrations, spatial and temporal drivers of these concentrations remain poorly understood. This study explores variation in dissolved GHG concentrations and their key chemical drivers across four streams with contrasting hydraulic conditions and nutrient availability in a coastal, temperate, suburbanized watershed. We use a nine-year dataset of weekly, year-round measurements of dissolved GHGs and stream physical–chemical variables. Structural equation modeling revealed distinct drivers of GHG concentrations with temperature, dissolved oxygen (DO), dissolved organic carbon (DOC), nitrate (NO3−), and stream discharge (Q) all being identified as important predictor variables. The magnitude and directionality of the relationship between each GHG and predictor variable varied across sites and seasons. Methane peaked in warmer months and N2O in cooler months, attributable to changes in temperature and DO. Relationships between N2O, DO, and temperature suggest predominance of denitrification as a pathway for N2O production. Results underscore the interplay of biogeochemical processes in driving GHG concentrations within river networks and the importance of long-term, four-season datasets to fully characterize spatial and temporal variability in temperate ecosystems and diverse river systems.