globalchange  > 气候变化与战略
DOI: 10.1016/j.scitotenv.2020.137052
论文题名:
Terrestrial loads of dissolved organic matter drive inter-annual carbon flux in subtropical lakes during times of drought
作者: Chiu C.-Y.; Jones J.R.; Rusak J.A.; Lin H.-C.; Nakayama K.; Kratz T.K.; Liu W.-C.; Tang S.-L.; Tsai J.-W.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 717
语种: 英语
英文关键词: Carbon flux ; Rainy season ; Subtropical lake ; Terrestrial DOM ; Trophic status
Scopus关键词: Biogeochemistry ; Carbon ; Carbon dioxide ; Dissolution ; Drought ; Ecosystems ; Forestry ; Organic compounds ; Sensitivity analysis ; Tropics ; Carbon fluxes ; Rainy seasons ; Subtropical lakes ; Terrestrial DOM ; Trophic status ; Lakes ; annual variation ; carbon flux ; dissolved inorganic carbon ; dissolved organic matter ; drought ; lake ecosystem ; seasonal variation ; trophic status
英文摘要: Lentic ecosystems are important agents of local and global carbon cycling, but their contribution varies along gradients of dissolved organic matter (DOM) and productivity. We investigated how contrasting summer and autumn precipitation can shape annual and inter-annual variation in ecosystem carbon (C) flux (gross primary production (GPP), ecosystem respiration (ER), and CO2 efflux) in two subtropical lakes differing substantially in trophic state and water color. Instrumented buoys recorded time series of free-water DO, terrestrial DOM (tDOM), chlorophyll a, water temperature profiles, and meteorological measurements over five years (2009–2011 and 2014–2015). Reduced precipitation caused immediate and prolonged effects on C flux in both lakes. During the drought year (2014) GPP and ER declined by 60 to 80% and both lakes were either CO2 sinks or neutral. In the subsequent wet year (2015), GPP and ER increased by 40 to 110%, and both lakes shifted to strong net CO2 emitters. Higher ecosystem R resulted from larger GPP while higher tDOM contributed to a dramatic increase in dissolved inorganic carbon, which intensified CO2 emission in both lakes. C flux was more responsive in the clear mesotrophic lake, declining by approximately 40% in the cumulative GPP and ER, and increasing by >400% in CO2 efflux whereas changes in the oligotrophic colored lake were more modest (approximately 30% and 300% for metabolic declines and efflux increases, respectively). Temporal variation and magnitude of C flux were governed by tDOM-mediated changes in epilimnetic nutrient levels and hypolimnetic light availability. This study demonstrated terrestrial loads of DOM strongly influence the inter-annual response and sensitivity of ecosystem C flux to variation in inter-annual precipitation. Our findings have important implications for predicting the trend, magnitude, duration, and sensitivity of the response of C flux in subtropical lakes/reservoirs to future changes in precipitation patterns under altered climatic conditions. © 2020 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158215
Appears in Collections:气候变化与战略

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作者单位: Research Center for Biodiversity, Academia Sinica, 128 Academia Road, Section 2, Nankang, Taipei, 11529, Taiwan; School of Natural Resources, University of Missouri, 103 Anheuser-Busch Natural Resources Building, Columbia, MO 65211, United States; Dorset Environmental Science Centre, Ontario Ministry of the Environment, Conservation and Parks, 1026 Bellwood Acres Road, P.O. Box 39, Dorset, ON P0A 1E0, Canada; Department of Biology, Kingston, Queen's University, 116 Barrie Street, Kingston, ON K7L 3N6, Canada; Department of Civil Engineering, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe, Hyogo 657-8501, Japan; University of Wisconsin-Madison, Trout Lake Station | 3110 Trout Lake Station Dr. Boulder JunctionWI 54512, United States; Department of Civil and Disaster Prevention Engineering, National United University, NO.2, Lien Da, Nan Shih Li, Miao-Li, 36003, Taiwan; Department of Biological Science and Technology, China Medical University, No.91, Hsueh-Shih Road, Taichung, 40402, Taiwan

Recommended Citation:
Chiu C.-Y.,Jones J.R.,Rusak J.A.,et al. Terrestrial loads of dissolved organic matter drive inter-annual carbon flux in subtropical lakes during times of drought[J]. Science of the Total Environment,2020-01-01,717
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