Site-to-site variability and temporal trends of DOC concentrations and fluxes in temperate forest soils

Borken, Werner; Ahrens, Bernhard; Schulz, Christoph; Zimmermann, Lothar

doi:10.1111/j.1365-2486.2011.02390.x

Cited by 86 publications

(51 citation statements)

References 54 publications

(71 reference statements)

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“…DOC is mostly mobilized at the forest floor (Borken et al, 2011). Stored in the soil or diffusively and slowly passing downwards, large parts of the DOC are absorbed or consumed by microorganisms, but when lateral flow and concentrated infiltration increase, net leaching of DOC increases as well.…”

Section: Model Solute Transportmentioning

confidence: 99%

“…riod are similarly large, thus pointing to a negligible effect of forest disturbance on DOC leaching. Numerous studies have identified the forest floor as a DOC source (Borken et al, 2011;Michalzik et al, 2001). Windthrow generally causes a (short-term) pulse of above-and belowground litter (Harmon et al, 2011).…”

Section: Impact Of Stormsmentioning

confidence: 99%

“…In mountainous catchments the latter flow paths are likely due to the steepness of the catchment slopes (Boyer et al, 1997;Sakamoto et al, 1999;Terajima and Moriizumi, 2013). The missing signal of forest disturbance on DOC concentrations at weir 1 even shortly after the disturbance may be due to the minor extension of the disturbed area, the minor increase of surface and shallow subsurface flow due to the relative low slope of the disturbed area, the buffering of increased topsoil DOC leaching due to absorption of DOC within the subsoil (Borken et al, 2011;Huber et al, 2004), missing DOC-rich riparian source areas (i.e. wetlands, floodplains) and the reduction in pre-disturbance organic matter input to soil (i.e.…”

Section: Impact Of Stormsmentioning

confidence: 99%

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Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

et al. 2016

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Abstract. Karst systems are important for drinking water supply. Future climate projections indicate increasing temperature and a higher frequency of strong weather events. Both will influence the availability and quality of water provided from karst regions. Forest disturbances such as windthrow can disrupt ecosystem cycles and cause pronounced nutrient losses from the ecosystems. In this study, we consider the time period before and after the wind disturbance period (2007/08) to identify impacts on DIN (dissolved inorganic nitrogen) and DOC (dissolved organic carbon) with a process-based flow and solute transport simulation model. When calibrated and validated before the disturbance, the model disregards the forest disturbance and its consequences on DIN and DOC production and leaching. It can therefore be used as a baseline for the undisturbed system and as a tool for the quantification of additional nutrient production. Our results indicate that the forest disturbance by windthrow results in a significant increase of DIN production lasting ∼ 3.7 years and exceeding the pre-disturbance average by 2.7 kg ha −1 a −1 corresponding to an increase of 53 %. There were no significant changes in DOC concentrations. With simulated transit time distributions we show that the impact on DIN travels through the hydrological system within some months. However, a small fraction of the system outflow (< 5 %) exceeds mean transit times of > 1 year.

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Section: Model Solute Transportmentioning

confidence: 99%

Section: Impact Of Stormsmentioning

confidence: 99%

Section: Impact Of Stormsmentioning

confidence: 99%

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Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

et al. 2016

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“…for forests and open land, respectively, which correspond to typical or average C org terr runoff concentrations for temperate forest landscapes, based on two literature syntheses (Michalzik et al, 2001;Borken et al, 2011). C org terr fluxes, modelled by LPJ-GUESS, increased in all future scenarios, by 30Á43% depending on the scenario.…”

Section: Land Surface and Drainage Basinmentioning

confidence: 99%

“…For non-wetland areas, C org terr exports were not simulated dynamically, but were estimated based on typical runoff C org terr concentration values of 40 and 8 mg L (1 for forests and open land areas, respectively (Michalzik et al, 2001;Borken et al, 2011). Absolute export fluxes of C org terr from these land cover classes depended on ecosystem runoff, simulated dynamically by LPJ-GUESS.…”

Section: Acknowledgementsmentioning

confidence: 99%

Future changes in the Baltic Sea acid–base (pH) and oxygen balances

Omstedt¹,

Edman

Claremar³

et al. 2012

Tellus B: Chemical and Physical Meteorology

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A B S T R A C T Possible future changes in Baltic Sea acidÁbase (pH) and oxygen balances were studied using a catchmentÁsea coupled model system and numerical experiments based on meteorological and hydrological forcing datasets and scenarios. By using objective statistical methods, climate runs for present climate conditions were examined and evaluated using Baltic Sea modelling. The results indicate that increased nutrient loads will not inhibit future Baltic Sea acidification; instead, the seasonal pH cycle will be amplified by increased biological production and mineralization. All examined scenarios indicate future acidification of the whole Baltic Sea that is insensitive to the chosen global climate model. The main factor controlling the direction and magnitude of future pH changes is atmospheric CO 2 concentration (i.e. emissions). Climate change and land-derived changes (e.g. nutrient loads) affect acidification mainly by altering the seasonal cycle and deep-water conditions. Apart from decreasing pH, we also project a decreased saturation state of calcium carbonate, decreased respiration index and increasing hypoxic area Á all factors that will threaten the marine ecosystem. We demonstrate that substantial reductions in fossil-fuel burning are needed to minimise the coming pH decrease and that substantial reductions in nutrient loads are needed to reduce the coming increase in hypoxic and anoxic waters.

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Linking variability in soil solution dissolved organic carbon to climate, soil type, and vegetation type

Camino‐Serrano

Gielen

Luyssaert

et al. 2014

Global Biogeochemical Cycles

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104

100

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Lateral transport of carbon plays an important role in linking the carbon cycles of terrestrial and aquatic ecosystems. There is, however, a lack of information on the factors controlling one of the main C sources of this lateral flux, i.e., the concentration of dissolved organic carbon (DOC) in soil solution across large spatial scales and under different soil, vegetation, and climate conditions. We compiled a database on DOC in soil solution down to 80 cm and analyzed it with the aim, first, to quantify the differences in DOC concentrations among terrestrial ecosystems, climate zones, soil, and vegetation types at global scale and second, to identify potential determinants of the site-to-site variability of DOC concentration in soil solution across European broadleaved and coniferous forests. We found that DOC concentrations were 75% lower in mineral than in organic soil, and temperate sites showed higher DOC concentrations than boreal and tropical sites. The majority of the variation (R 2 = 0.67-0.99) in DOC concentrations in mineral European forest soils correlates with NH 4 + , C/N, Al, and Fe as the most important predictors. Overall, our results show that the magnitude (23% lower in broadleaved than in coniferous forests) and the controlling factors of DOC in soil solution differ between forest types, with site productivity being more important in broadleaved forests and water balance in coniferous stands.

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Site-to-site variability and temporal trends of DOC concentrations and fluxes in temperate forest soils

Cited by 86 publications

References 54 publications

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

Model-aided quantification of dissolved carbon and nitrogen release after windthrow disturbance in an Austrian karst system

Future changes in the Baltic Sea acid–base (pH) and oxygen balances

Linking variability in soil solution dissolved organic carbon to climate, soil type, and vegetation type

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