Carbocentric limnology: looking back, looking forward

Prairie, Yves T.

doi:10.1139/f08-011

Cited by 148 publications

(118 citation statements)

References 41 publications

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“…When the long-term burial of C by lakes is coupled with their ability to respire terrestrially derived DOC in the water column, their importance for C-cy-cling in the arctic is unambiguous. There is a clear need for regional landscape scale C-balances and the results of this study suggest lakes need to be incorporated more fully into these estimates (Kortelainen et al, 2004;Cole et al, 2007;Prairie, 2008).…”

Section: Resultsmentioning

confidence: 98%

Holocene carbon burial by lakes in SW Greenland

Anderson

D'Andrea

Fritz

2009

Global Change Biology

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The role of the Arctic in future global change processes is predicted to be important because of the large carbon (C) stocks contained in frozen soils and peatlands. Lakes are an important component of arctic landscapes although their role in storing C is not well prescribed. The area around Kangerlussuaq, SW Greenland (66–68°N, 49–54°W) has extremely high lake density, with ∼20 000 lakes that cover about 14% of the land area. C accumulation rates and standing stock (kg C m−2), representing late‐ to mid‐Holocene C burial, were calculated from AMS 14C‐dated sediment cores from 11 lakes. Lake ages range from ∼10 000 cal yr bp to ∼5400 cal yr bp, and reflect the withdrawal of the ice sheet from west to east. Total standing stock of C accumulated in the studied lakes for the last ∼8000 years ranged from 28 to 71 kg C m−2, (mean: ∼42 kg C m−2). These standing stock determinations yield organic C accumulation rates of 3.5–11.5 g C m−2 yr−1 (mean: ∼6 g C m−2 yr−1) for the last 4500 years. Mean C accumulation rates are not different for the periods 8–4.5 and 4.5–0 ka, despite cooling trends associated with the neoglacial period after 4.5 ka. We used the mean C standing stock to estimate the total C pool in small lakes (<100 ha) of the Kangerlussuaq region to be ∼4.9 × 1013 g C. This C stock is about half of that estimated for the soil pool in this region (but in 5% of the land area) and indicates the importance of incorporating lakes into models of regional C balance at high latitudes.

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Section: Resultsmentioning

confidence: 98%

Holocene carbon burial by lakes in SW Greenland

Anderson

D'Andrea

Fritz

2009

Global Change Biology

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“…These complexities may help to explain our results and the lack of consensus apparent in the literature about the effects of DOC on community or ecosystem respiration, with some surveys reporting a clear effect of DOC on respiration and others reporting no effect (Table 5). Resolving this puzzle will require that limnologists begin to couple measurements of respiration with characterization of organic matter loads in terms of quantity and quality (Prairie et al 2002;del Giorgio and Williams 2005;Hanson et al 2011). …”

Section: Does Average Annual Respiration Increase With Doc?-mentioning

confidence: 99%

Ecosystem respiration: Drivers of daily variability and background respiration in lakes around the globe

Solomon

Bruesewitz²,

Richardson³

et al. 2013

Limnology & Oceanography

207

286

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We assembled data from a global network of automated lake observatories to test hypotheses regarding the drivers of ecosystem metabolism. We estimated daily rates of respiration and gross primary production (GPP) for up to a full year in each lake, via maximum likelihood fits of a free-water metabolism model to continuous highfrequency measurements of dissolved oxygen concentrations. Uncertainties were determined by a bootstrap analysis, allowing lake-days with poorly constrained rate estimates to be down-weighted in subsequent analyses. GPP and respiration varied considerably among lakes and at seasonal and daily timescales. Mean annual GPP and respiration ranged from 0.1 to 5.0 mg O 2 L 21 d 21 and were positively related to total phosphorus but not dissolved organic carbon concentration. Within lakes, significant day-to-day differences in respiration were common despite large uncertainties in estimated rates on some lake-days. Daily variation in GPP explained 5% to 85% of the daily variation in respiration after temperature correction. Respiration was tightly coupled to GPP at a daily scale in oligotrophic and dystrophic lakes, and more weakly coupled in mesotrophic and eutrophic lakes. Background respiration ranged from 0.017 to 2.1 mg O 2 L 21 d 21 and was positively related to indicators of recalcitrant allochthonous and autochthonous organic matter loads, but was not clearly related to an indicator of the quality of allochthonous organic matter inputs.Gross primary production (GPP) and respiration are perhaps the two most fundamental processes in ecosystems. At the cellular or organismal level, they describe biochemical pathways that make organic carbon molecules and energy available to cells. When these cellular processes are integrated across an entire ecosystem, the result-ecosystemlevel GPP, ecosystem respiration, or collectively ecosystem metabolism-describes biogeochemical and trophic processes occurring at the system level.There is substantial interest in understanding the controls on ecosystem metabolism in aquatic (Mulholland et al.

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“…Fluvial exports of terrestrial carbon (C) have long been recognised as important modulators of aquatic ecosystem structure and function (Birge and Juday 1927;Prairie 2008). Consideration of their importance as components of terrestrial and global C budgets is more recent however Cole et al 2007), and partly reflects that climate change has prompted the need for more accurate greenhouse gas (GHG) inventories and raised interest in the C sequestration capacity of soils to offset anthropogenic emissions (Smith et al 1997;IPCC 2006).…”

Section: Introductionmentioning

confidence: 99%

Magnitude, form and bioavailability of fluvial carbon exports from Irish organic soils under pasture

Barry

Renou‐Wilson

Wilson³

et al. 2016

Aquat Sci

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Organic soils are widespread in Ireland and vulnerable to degradation via drainage for agriculture. The soil-landuse combination of pasture on organic soils may play a disproportionate role in regional C dynamics but is yet to receive study. Fluvial C fluxes and labile organic fractions were determined for two such sites at nested field (c.4 ha) and subcatchment scales ([40 ha); one relatively dry and nutrient rich, the other wetter and nutrient poor. Field scale flux from the nutrient poor site over 2 years was 38.9 ± 6.6 g C m -2 yr -1 with DIC [ DOC [ POC at 57, 32 and 11 % respectively, and 72 % DIC was comprised of above equilibrium CO 2 . At the nutrient rich site, which overlies limestone geology, field scale export over an individual year was 90.4 g C m -2 with DIC [ DOC [ POC at 49, 42 and 9 %, but with 90 % DIC as bicarbonate. By comparison with the nutrient poor site, the magnitude and composition of inorganic C exports from the nutrient rich site implied considerable export of soil-respiratory C as bicarbonate, and lower evasion losses due to carbonate system buffering. Labile DOC determined using dark incubations indicated small fractions (5-10 %) available for remineralisation over typical downstream transit times of days to weeks. These fractions are probably conservative as photolysis in the environment can increase the proportion of labile compounds via photocleavage and directly remineralise organic matter. This study demonstrates that monitoring at soil-water interfaces can aid capture of total landscape fluvial fluxes by precluding the need to incorporate prior C evasion, although rapid runoff responses at field scales can necessitate high resolution flow proportional, and hydrograph sampling to constrain uncertainty of flux estimates.

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Carbocentric limnology: looking back, looking forward

Cited by 148 publications

References 41 publications

Holocene carbon burial by lakes in SW Greenland

Holocene carbon burial by lakes in SW Greenland

Ecosystem respiration: Drivers of daily variability and background respiration in lakes around the globe

Magnitude, form and bioavailability of fluvial carbon exports from Irish organic soils under pasture

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