Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026336 |
Changing Source-Transport Dynamics Drive Differential Browning Trends in a Boreal Stream Network | |
Fork, Megan L.1,2; Sponseller, Ryan A.1; Laudon, Hjalmar3 | |
2020-02-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; USA |
英文摘要 | Dissolved organic carbon (DOC) concentrations are increasing in freshwaters worldwide, with important implications for aquatic ecology, biogeochemistry, and ecosystem services. While multiple environmental changes may be responsible for these trends, predicting the occurrence and magnitude of "browning" and relating such trends to changes in DOC sources versus hydrologic transport remain key challenges. We analyzed long-term trends in DOC concentration from the two dominant landscape sources (riparian soils and mire peats) and receiving streams in a boreal catchment to evaluate how browning patterns relate to land cover and hydrology. Increases in stream DOC were widespread but not universal. Browning was most pronounced in small, forested streams, where trends corresponded to twofold to threefold increases in DOC production in riparian soils and increases in annual DOC export from a forested headwater. By contrast, DOC did not change in mire peats or streams draining catchments with high lake or mire cover, nor did we observe trends in DOC export from a mire-dominated headwater. The distinct long-term trends in DOC sources also altered concentration-discharge relationships, with a forested headwater shifting from transport-limited toward chemostasis, and a mire outlet stream shifting from chemostasis to source-limitated. Modified DOC supply to headwaters, together with altered seasonal hydrology and differences in the dominant water source along the stream network gave rise to predictable browning trends and consistent concentration-discharge relationships. Overall, our results show that the sources of DOC to boreal aquatic ecosystems are responding to environmental change in fundamentally different ways, with important consequences for browning along boreal stream networks. |
英文关键词 | brownification wetland riparian concentration-discharge flux DOC |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000535672800041 |
WOS关键词 | DISSOLVED ORGANIC-CARBON ; RIPARIAN ZONES ; WATER ; CATCHMENT ; TERM ; DOC ; BIOGEOCHEMISTRY ; HYDROLOGY ; HEADWATER ; RESPONSES |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280541 |
专题 | 资源环境科学 |
作者单位 | 1.Umea Univ, Dept Ecol & Environm Sci, Climate Impacts Res Ctr CIRC, Umea, Sweden; 2.Cary Inst Ecosyst Studies, Millbrook, NY 12545 USA; 3.Swedish Univ Agr Sci, Dept Forest Ecol & Management, Umea, Sweden |
推荐引用方式 GB/T 7714 | Fork, Megan L.,Sponseller, Ryan A.,Laudon, Hjalmar. Changing Source-Transport Dynamics Drive Differential Browning Trends in a Boreal Stream Network[J]. WATER RESOURCES RESEARCH,2020,56(2). |
APA | Fork, Megan L.,Sponseller, Ryan A.,&Laudon, Hjalmar.(2020).Changing Source-Transport Dynamics Drive Differential Browning Trends in a Boreal Stream Network.WATER RESOURCES RESEARCH,56(2). |
MLA | Fork, Megan L.,et al."Changing Source-Transport Dynamics Drive Differential Browning Trends in a Boreal Stream Network".WATER RESOURCES RESEARCH 56.2(2020). |
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