Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.16094 |
The role of terrestrial productivity and hydrology in regulating aquatic dissolved organic carbon concentrations in boreal catchments | |
Xudan Zhu; Liang Chen; Jukka Pumpanen; Anne Ojala; John Zobitz; Xuan Zhou; Hjalmar Laudon; Marjo Palviainen; Kimmo Neitola; Frank Berninger | |
2022-01-30 | |
发表期刊 | Global Change Biology
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出版年 | 2022 |
英文摘要 | The past decades have witnessed an increase in dissolved organic carbon (DOC) concentrations in the catchments of the Northern Hemisphere. Increasing terrestrial productivity and changing hydrology may be reasons for the increases in DOC concentration. The aim of this study is to investigate the impacts of increased terrestrial productivity and changed hydrology following climate change on DOC concentrations. We tested and quantified the effects of gross primary production (GPP), ecosystem respiration (RE) and discharge on DOC concentrations in boreal catchments over 3 years. As catchment characteristics can regulate the extent of rising DOC concentrations caused by the regional or global environmental changes, we selected four catchments with different sizes (small, medium and large) and landscapes (forest, mire and forest-mire mixed). We applied multiple models: Wavelet coherence analysis detected the delay-effects of terrestrial productivity and discharge on aquatic DOC variations of boreal catchments; thereafter, the distributed-lag linear models quantified the contributions of each factor on DOC variations. Our results showed that the combined impacts of terrestrial productivity and discharge explained 62% of aquatic DOC variations on average across all sites, whereas discharge, gross primary production (GPP) and RE accounted for 26%, 22% and 3%, respectively. The impact of GPP and discharge on DOC changes was directly related to catchment size: GPP dominated DOC fluctuations in small catchments (<1 km2), whereas discharge controlled DOC variations in big catchments (>1 km2). The direction of the relation between GPP and discharge on DOC varied. Increasing RE always made a positive contribution to DOC concentration. This study reveals that climate change-induced terrestrial greening and shifting hydrology change the DOC export from terrestrial to aquatic ecosystems. The work improves our mechanistic understanding of surface water DOC regulation in boreal catchments and confirms the importance of DOC fluxes in regulating ecosystem C budgets. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
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/346763 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Xudan Zhu,Liang Chen,Jukka Pumpanen,et al. The role of terrestrial productivity and hydrology in regulating aquatic dissolved organic carbon concentrations in boreal catchments[J]. Global Change Biology,2022. |
APA | Xudan Zhu.,Liang Chen.,Jukka Pumpanen.,Anne Ojala.,John Zobitz.,...&Frank Berninger.(2022).The role of terrestrial productivity and hydrology in regulating aquatic dissolved organic carbon concentrations in boreal catchments.Global Change Biology. |
MLA | Xudan Zhu,et al."The role of terrestrial productivity and hydrology in regulating aquatic dissolved organic carbon concentrations in boreal catchments".Global Change Biology (2022). |
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