Cryptic wetlands: integrating hidden wetlands in regression models of the export of dissolved organic carbon from forested landscapes

Creed, Irena F.; Sanford, S. E.; Beall, F. D.; Molot, Lewis A.; Dillon, Peter J.

doi:10.1002/hyp.1357

Cited by 187 publications

(192 citation statements)

References 43 publications

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“…In many areas, increasing DOC in surface waters has been reported and variously ascribed to the effects of reduced acid precipitation, changes in land management, climate change and increased drought frequency (Laudon et al 2012). Given climate trajectories and increased land use change in northern regions, predictive models are needed to inform managers of potential water quality changes, including DOC from peat-covered catchments (Dillon and Molot 1997;Creed et al 2003;Creed 2008). These approaches need to conceptualise the soil biogeochemical processes that generate DOC with hydrological transport mechanisms that connect sources to the stream network.…”

Section: Discussionmentioning

confidence: 99%

Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

et al. 2014

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Catchment dissolved organic carbon (DOC) fluxes are governed by complex interactions, which control biogeochemical processes generating DOC and hydrological connectivity, facilitating transport through the landscape to streams. This paper presents the development of a coupled hydrologicalbiogeochemical model for a northern watershed with organic-rich soils, to simulate daily DOC concentrations. The parsimonious model design allows the relative importance of DOC fluxes from the major landscape units (e.g. hillslopes, groundwater and riparian saturation area) to be determined. The dynamic extent of the saturated riparian zone, which at maximum wetness comprised 40 % of the drainage area, contributed 84 % of DOC to the stream, of which 16 % was derived from the hillslope soils. This shows the disproportional riparian influence on stream water chemistry and the importance of the non-linearity in hydrological connectivity. The temporal connectivity of each of the landscape units was dependent on antecedent moisture conditions, with highly transient connections between the hillslope and valley bottom saturated area, which were entirely disconnected during the driest periods. The groundwater contribution remained constant, but its relative importance increased during the driest periods. The study emphasises the importance of conceptualising hydrological connectivity and its relation to hydroclimatic factors, as well soil biogeochemical processes, when modelling stream water DOC.

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Section: Discussionmentioning

confidence: 99%

Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

et al. 2014

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“…This reflected interactions between the wetlands, their hydrologic connectivity to surface flow paths, and runoff. These depressional wetlands were strong predictors of dissolved organic C (Creed et al, 2003) and dissolved organic N (Creed and Beall, 2005) to surface waters. In contrast, topographic metrics representing variable source areas were strong predictors of nitrate export (Creed and Beall, 2005).…”

confidence: 99%

Advances in Canadian Forest Hydrology, 2003-2007

Buttle¹,

Creed²,

Moore³

2009

Canadian Water Resources Journal

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Recent research in forest hydrology in Canada is reviewed, with a focus on studies of hydrological and hydrochemical processes in natural and disturbed forest landscapes during the 2003-2007 period. The value of hydrologic classification schemes for understanding these processes and guiding effective forest management practices is highlighted, as are the spatially and temporally extensive hydrologic datasets needed to test these classifications. Studies of hydrologic response to natural and anthropogenic forest disturbance are reviewed, and the strengths and limitations of paired-basin experiments for assessing forest disturbance effects on watershed processes are evaluated. Recent shifts in the context of forest hydrology research in Canada are presented, such as issues of climate warming, the mismatch between experimental and management scales, and the increasing need to address cumulative effects of both natural and anthropogenic forest disturbance.Résumé : Les recherches récentes en hydrologie des forêts sont examinées, l'accent étant mis sur l'étude des processus hydrologiques et hydrochimiques dans les paysages forestiers naturels et perturbés de 2003 à 2007. La valeur des plans de classification hydrologique pour la compréhension de ces processus et pour l'orientation des pratiques de gestion efficace des forêts est mise en relief, tout comme les ensembles de données extensives, spatiales et temporelles, nécessaires pour tester ces classifications. Les études de la réponse hydrologique aux perturbations naturelles et anthropiques de la forêt sont examinées. Sont également évaluées les forces et les limitations des expériences entourant les bassins jumelés pour l'analyse des effets de la perturbation des forêts sur les processus liés aux bassins hydrographiques. Sont aussi abordés les changements récents touchant les recherches en hydrologie des forêts au Canada, notamment le problème du changement climatique, le décalage entre l'échelle expérimentale et l'échelle de gestion, et le besoin croissant de s'attaquer aux effets cumulatifs de la perturbation des forêts, d'origine naturelle ou anthropique. 114Canadian Water Resources Journal/Revue canadienne des ressources hydriques

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“…Wetland environments encompass the transitional zone between land and water where the land is covered by shallow water or with a water table at or near the surface (Cowardin et al 1979). Alternatively, wetlands are defined as spatial units having ecosystems associated with long-term inundation of the soil (Keddy 2010).…”

Section: Introductionmentioning

confidence: 99%

Regional climate sensitivity of wetland environments in Rwanda: the need for a location-specific approach

2015

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Wetlands are sustaining large communities of people in Rwanda where 10 % of its land surface consists of many local wetlands. Sustainable future management of these numerous wetlands requires a reliable inventory of their location and a dynamic quantitative characterization that allows assessment of their climate change sensitivity. The aim of this study was to assess the importance of climatic factors for determining wetland location at different regional scales. Wetland locations were analyzed and statistically modeled using their location factors with logistic regression. Wetland location probability was determined using topographic (elevation, slope), hydrological (contributing area) and climatic (temperature and rainfall) location factors. A wetland location probability map was made that demonstrated a calibration accuracy of 87.9 % correct at national level compared to an existing inventory, displaying even better fits at subnational level (reaching up to 98 % correct). A validation accuracy of 86.2 % was obtained using an independently collected dataset. A sensitivity analysis was applied to the threshold values used as cutoff value between wetland/non-wetland, demonstrating a robust performance. The developed models were used in a sensitivity scenario analysis to assess future wetland location probability to changes in temperature and rainfall. In particular, wetlands in the central regions of Rwanda demonstrate a high sensitivity to changes in temperature (1 % increase causes a net probable wetland area decline by 12.4 %) and rainfall (?1 % causes a net increase by 1.6 %). This potentially significant impact on wetland number and location probability indicates that climate-sensitive future planning of wetland use is required in Rwanda.

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Cryptic wetlands: integrating hidden wetlands in regression models of the export of dissolved organic carbon from forested landscapes

Cited by 187 publications

References 43 publications

Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

Advances in Canadian Forest Hydrology, 2003-2007

Regional climate sensitivity of wetland environments in Rwanda: the need for a location-specific approach

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