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T. E. H. Allott - One of the best experts on this subject based on the ideXlab platform.

  • Fluvial Carbon Flux from headwater peatland streams: significance of particulate Carbon Flux
    Earth Surface Processes and Landforms, 2012
    Co-Authors: R. R. Pawson, Martin Evans, T. E. H. Allott
    Abstract:

    The extensive blanket peatlands of the UK uplands account for almost half of total national terrestrial Carbon storage. However, much of the blanket peat is severely eroded so that the contemporary role of the peatland system in Carbon sequestration is compromised by losses of organic Carbon in dissolved (DOC) and particulate (POC) form in the fluvial system. This paper presents the first detailed assessment of dissolved and organic Carbon losses from a severely eroded headwater peatland (River Ashop, South Pennines, UK). Total annual fluvial organic Carbon losses range from 29–106 Mg C km,-2 decreasing from the headwaters to the main catchment outlet. In contrast to less eroded systems fluvial organic Carbon Flux is dominated by POC. POC:DOC ratios decrease from values of 4 in the headwaters to close to unity at the catchment outlet. These results demonstrate the importance of eroding headwater sites as sources of POC to the fluvial system. Comparison with a range of catchment characteristics reveals that drainage density is the best predictor of POC:DOC but there is scatter in the relation in the headwaters. Steep declines in specific POC yield from headwater catchments are consistent with storage of POC within the fluvial system. Key to the significance of fluvial Carbon Flux in greenhouse gas budgets is understanding the fate of fluvial Carbon. Further work on the fate of POC and the role of floodplains in fluvial Carbon cycling is urgently required. Copyright © 2012 John Wiley & Sons, Ltd.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2008
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, exports of 35.14 t organic Carbon (OC) are estimated from the catchment, which represents an areal value of 92.47 g C m?2 a?1. POC was the most significant form of organic Carbon export, accounting for 80% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2007
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, J. J. Rothwell, S. Daniels, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, 40.8 t organic Carbon (OC) is exported from the catchment, which represents an areal value of 107 gC m?2 a?1. POC was the most significant form of organic Carbon export, accounting for ~82% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

R. R. Pawson - One of the best experts on this subject based on the ideXlab platform.

  • Fluvial Carbon Flux from headwater peatland streams: significance of particulate Carbon Flux
    Earth Surface Processes and Landforms, 2012
    Co-Authors: R. R. Pawson, Martin Evans, T. E. H. Allott
    Abstract:

    The extensive blanket peatlands of the UK uplands account for almost half of total national terrestrial Carbon storage. However, much of the blanket peat is severely eroded so that the contemporary role of the peatland system in Carbon sequestration is compromised by losses of organic Carbon in dissolved (DOC) and particulate (POC) form in the fluvial system. This paper presents the first detailed assessment of dissolved and organic Carbon losses from a severely eroded headwater peatland (River Ashop, South Pennines, UK). Total annual fluvial organic Carbon losses range from 29–106 Mg C km,-2 decreasing from the headwaters to the main catchment outlet. In contrast to less eroded systems fluvial organic Carbon Flux is dominated by POC. POC:DOC ratios decrease from values of 4 in the headwaters to close to unity at the catchment outlet. These results demonstrate the importance of eroding headwater sites as sources of POC to the fluvial system. Comparison with a range of catchment characteristics reveals that drainage density is the best predictor of POC:DOC but there is scatter in the relation in the headwaters. Steep declines in specific POC yield from headwater catchments are consistent with storage of POC within the fluvial system. Key to the significance of fluvial Carbon Flux in greenhouse gas budgets is understanding the fate of fluvial Carbon. Further work on the fate of POC and the role of floodplains in fluvial Carbon cycling is urgently required. Copyright © 2012 John Wiley & Sons, Ltd.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2008
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, exports of 35.14 t organic Carbon (OC) are estimated from the catchment, which represents an areal value of 92.47 g C m?2 a?1. POC was the most significant form of organic Carbon export, accounting for 80% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2007
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, J. J. Rothwell, S. Daniels, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, 40.8 t organic Carbon (OC) is exported from the catchment, which represents an areal value of 107 gC m?2 a?1. POC was the most significant form of organic Carbon export, accounting for ~82% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

Brian J Enquist - One of the best experts on this subject based on the ideXlab platform.

  • a general integrative model for scaling plant growth Carbon Flux and functional trait spectra
    Nature, 2007
    Co-Authors: Brian J Enquist, Andrew J Kerkhoff, Scott C Stark, Nathan G Swenson, Megan C Mccarthy, Charles A Price
    Abstract:

    The ability to use plants' functional traits — such as leaf area and mass, number of leaves per plant and efficiency of biomass production — to predict plant growth and Carbon Flux at the ecosystem scale is of importance in a range of fields including ecology, population biology and global change science. Enquist et al. have developed a model that can achieve such predictions, providing a mechanistic basis to scale from trait diversity to ecosystem processes. A generalized trait-based model is derived to predict plant growth and hence the Flux of Carbon within and across plants. The model provides a theoretical basis for the merging of metabolic scaling theory with recent work on functional trait spectra, in turn helping to understand the integration of functional traits within plant phenotypes. Linking functional traits to plant growth is critical for scaling attributes of organisms to the dynamics of ecosystems1,2 and for understanding how selection shapes integrated botanical phenotypes3. However, a general mechanistic theory showing how traits specifically influence Carbon and biomass Flux within and across plants is needed. Building on foundational work on relative growth rate4,5,6, recent work on functional trait spectra7,8,9, and metabolic scaling theory10,11, here we derive a generalized trait-based model of plant growth. In agreement with a wide variety of empirical data, our model uniquely predicts how key functional traits interact to regulate variation in relative growth rate, the allometric growth normalizations for both angiosperms and gymnosperms, and the quantitative form of several functional trait spectra relationships. The model also provides a general quantitative framework to incorporate additional leaf-level trait scaling relationships7,8 and hence to unite functional trait spectra with theories of relative growth rate, and metabolic scaling. We apply the model to calculate Carbon use efficiency. This often ignored trait, which may influence variation in relative growth rate, appears to vary directionally across geographic gradients. Together, our results show how both quantitative plant traits and the geometry of vascular transport networks can be merged into a common scaling theory. Our model provides a framework for predicting not only how traits covary within an integrated allometric phenotype but also how trait variation mechanistically influences plant growth and Carbon Flux within and across diverse ecosystems.

D. R. Lord - One of the best experts on this subject based on the ideXlab platform.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2008
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, exports of 35.14 t organic Carbon (OC) are estimated from the catchment, which represents an areal value of 92.47 g C m?2 a?1. POC was the most significant form of organic Carbon export, accounting for 80% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2007
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, J. J. Rothwell, S. Daniels, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, 40.8 t organic Carbon (OC) is exported from the catchment, which represents an areal value of 107 gC m?2 a?1. POC was the most significant form of organic Carbon export, accounting for ~82% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

M. G. Evans - One of the best experts on this subject based on the ideXlab platform.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2008
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, exports of 35.14 t organic Carbon (OC) are estimated from the catchment, which represents an areal value of 92.47 g C m?2 a?1. POC was the most significant form of organic Carbon export, accounting for 80% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

  • Fluvial organic Carbon Flux from an eroding peatland catchment, southern Pennines, UK
    Hydrology and Earth System Sciences Discussions, 2007
    Co-Authors: R. R. Pawson, D. R. Lord, M. G. Evans, J. J. Rothwell, S. Daniels, T. E. H. Allott
    Abstract:

    This study investigates for the first time the relative importance of dissolved organic Carbon (DOC) and particulate organic Carbon (POC) in the fluvial Carbon Flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual Flux of fluvial organic Carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of Flux in only 8% of the time. On an annual cycle, 40.8 t organic Carbon (OC) is exported from the catchment, which represents an areal value of 107 gC m?2 a?1. POC was the most significant form of organic Carbon export, accounting for ~82% of the estimated Flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.