Journal of Geophysical Research: Earth Surface

Linking Physical, Chemical, and Biological Processes in Watersheds from the Cellular and Grain Scales to the Landscape Scale
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    2. Regular Articles
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      Thermokarst and export of sediment and organic carbon in the Sheldrake River watershed, Nunavik, Canada (pages 1729–1745)

      Maxime Jolivel and Michel Allard

      Version of Record online: 9 SEP 2013 | DOI: 10.1002/jgrf.20119

      Key Points

      • recent permafrost decay in the discontinuous zone
      • increase in hydrological connectivity
      • increase in sediment and carbon input from thermokarst
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      Nonnative Pacific salmon alter hot spots of sediment nitrification in Great Lakes tributaries (pages 436–444)

      Peter S. Levi and Jennifer L. Tank

      Version of Record online: 3 APR 2013 | DOI: 10.1002/jgrg.20044

      Key Points

      • Introduced salmon alter stream nitrogen dynamics in Great Lakes tributaries
      • Sediment nitrification modifies the salmon-derived ammonium subsidy to nitrate
      • Response of nitrifying bacteria in stream sediment to salmon is habitat-specific
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      Contrasting CO2 concentration discharge dynamics in headwater streams: A multi-catchment comparison (pages 445–461)

      K. J. Dinsmore, M. B. Wallin, M. S. Johnson, M. F. Billett, K. Bishop, J. Pumpanen and A. Ojala

      Version of Record online: 3 APR 2013 | DOI: 10.1002/jgrg.20047

      Key Points

      • Concentration-discharge relationships were not consistent across catchments
      • Bimodal concentration distributions indicate distinct CO2 sources
      • In the 3 headwater streams, top 30% of flow was most important to total export
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      Streambed nitrogen cycling beyond the hyporheic zone: Flow controls on horizontal patterns and depth distribution of nitrate and dissolved oxygen in the upwelling groundwater of a lowland river (pages 54–67)

      Stefan Krause, Christina Tecklenburg, Matthias Munz and Emma Naden

      Version of Record online: 31 JAN 2013 | DOI: 10.1029/2012JG002122

      Key Points

      • Nitrate concentrations change significantly along up-welling streambed passage
      • Increased nitrogen turnover in streambeds extends beyond hyporheic zones
      • Low conductivity strata affect GW up-welling oxygen and nitrate concentrations
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      Distribution characteristics of transparent exopolymer particles in the Pearl River estuary, China

      Cui-Ci Sun, You-Shao Wang, Qian P. Li, Wei-Zhong Yue, Yu-Tu Wang, Fu-Lin Sun and Ya-Lan Peng

      Version of Record online: 6 DEC 2012 | DOI: 10.1029/2012JG001951

      Key Points

      • TEP in PRE was generally dominated by small sizes (2-40 mu m)
      • Aggregation of TEP was enhanced with increased Ca2+ concentration
      • Hydrodynamic process is an important factor for TEP in the bottom layer
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      Modeling wood dynamics, jam formation, and sediment storage in a gravel-bed stream

      B. C. Eaton, M. A. Hassan and S. L. Davidson

      Version of Record online: 14 NOV 2012 | DOI: 10.1029/2012JF002385

      Key Points

      • Our stochastic model predicts wood loads that are consistent with field data
      • We have simulated reasonable LW jam dynamics on the basis of simple physical rules
      • Our model relates wood loads to channel morphology characteristics
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      Large difference of inhibitive effect of nitrogen deposition on soil methane oxidation between plantations with N-fixing tree species and non-N-fixing tree species

      Wei Zhang, Xiaomin Zhu, Lei Liu, Shenglei Fu, Hao Chen, Juan Huang, Xiankai Lu, Zhanfeng Liu and Jiangming Mo

      Version of Record online: 10 NOV 2012 | DOI: 10.1029/2012JG002094

      Key Points

      • N input significantly decreased CH4 uptake in N-fixing tree species plantation
      • Difference inhibitive effect of N input on CH4 uptake between both plantations
      • N deposition would decrease the capability of N-fixing plantations for CH4 sink
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      A network model for prediction and diagnosis of sediment dynamics at the watershed scale

      Sopan Patil, Murugesu Sivapalan, Marwan A. Hassan, Sheng Ye, Ciaran J. Harman and Xiangyu Xu

      Version of Record online: 9 NOV 2012 | DOI: 10.1029/2012JF002400

      Key Points

      • The model characterizes sediment export from hillslope to watershed scale
      • Semi-distributed configuration enables process diagnosis across multiple scales
      • Differences in coarse and fine sediment movement influence export patterns
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      Linking runoff and erosion dynamics to nutrient fluxes in a degrading dryland landscape

      Katerina Michaelides, Debbie Lister, John Wainwright and Anthony J. Parsons

      Version of Record online: 2 NOV 2012 | DOI: 10.1029/2012JG002071

      Key Points

      • There are important linkages between physical and biogeochemical processes
      • These linkages are controlled by plant structure
      • Grasslands lose more nutrients than shrubs due to high losses of fine sediment
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      River profile controls on channel morphology, debris flow disturbance, and the spatial extent of salmonids in steep mountain streams

      Christine L. May and Thomas E. Lisle

      Version of Record online: 27 OCT 2012 | DOI: 10.1029/2011JF002324

      Key Points

      • Geomorphic process domains link to the spatial distribution of salmon
      • Steepness and concavity indexes of river profiles are predictors of fish habitat
      • Reach morphology and disturbance potential can be inferred from river profiles
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      Scaling flow path processes to fluvial landscapes: An integrated field and model assessment of temperature and dissolved oxygen dynamics in a river-floodplain-aquifer system

      Ashley M. Helton, Geoffrey C. Poole, Robert A. Payn, Clemente Izurieta and Jack A. Stanford

      Version of Record online: 23 OCT 2012 | DOI: 10.1029/2012JG002025

      Key Points

      • We linked temperature and oxygen models with a floodplain hydrologic model
      • The model fit dissolved oxygen measured across the floodplain and seasons
      • The model illustrates spatiotemporal heterogeneity within the alluvial aquifer
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      Reoccupation of floodplains by rivers and its relation to the age structure of floodplain vegetation

      Christopher P. Konrad

      Version of Record online: 17 OCT 2012 | DOI: 10.1029/2011JG001906

      Key Points

      • Temporal scaling of channel occupation of floodplains depends on reoccupation
      • Probability of reoccupation decreases with time since an area was abandoned
      • Power function accounts for reoccupation and floodplain vegetation age structure
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      Surface micro-topography causes hot spots of biogeochemical activity in wetland systems: A virtual modeling experiment

      S. Frei, K. H. Knorr, S. Peiffer and J. H. Fleckenstein

      Version of Record online: 10 OCT 2012 | DOI: 10.1029/2012JG002012

      Key Points

      • Biogeochemical hot spots in wetlands can form because of micro-topography
      • Interactions between hydrology and biogeochemistry are simulated
      • Importance of understanding hydrological/biogeochemical feebacks within wetlands
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      Hydrogeomorphology of the hyporheic zone: Stream solute and fine particle interactions with a dynamic streambed

      J. W. Harvey, J. D. Drummond, R. L. Martin, L. E. McPhillips, A. I. Packman, D. J. Jerolmack, S. H. Stonedahl, A. F. Aubeneau, A. H. Sawyer, L. G. Larsen and C. R. Tobias

      Version of Record online: 9 OCT 2012 | DOI: 10.1029/2012JG002043

      Key Points

      • Hyporheic exchange of solutes and fine particles was linked to bedform dynamics
      • Solutes and fines stored in hyporheic were differentially mobilized by flood
      • Flood duration, bedform relaxation, and hyporheic residence time were controls
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      Morphodynamic controls on redox conditions and on nitrogen dynamics within the hyporheic zone: Application to gravel bed rivers with alternate-bar morphology

      A. Marzadri, D. Tonina and A. Bellin

      Version of Record online: 20 SEP 2012 | DOI: 10.1029/2012JG001966

      Key Points

      • Modeling dissolved inorganic nitrogen cycle within the hyporheic zone
      • Investigates the effects of bar morphology on hyporheic nitrogen cycle
      • Compares the model results with measured data of nitrous oxide emissions
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      Nanoscale channels on ectomycorrhizal-colonized chlorite: Evidence for plant-driven fungal dissolution

      Salvatore A. Gazzè, Loredana Saccone, K. Vala Ragnarsdottir, Mark M. Smits, Adele L. Duran, Jonathan R. Leake, Steven A. Banwart and Terence J. McMaster

      Version of Record online: 18 AUG 2012 | DOI: 10.1029/2012JG002016

      Key Points

      • Channels produced on chlorite due to fungal colonization
      • Axenic microcosm - fungi the only living organisms in contact with the mineral
      • Ectomycorrhizal fungi, in symbiosis with tree roots in microcosm
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      Effects of solute breakthrough curve tail truncation on residence time estimates: A synthesis of solute tracer injection studies

      J. D. Drummond, T. P. Covino, A. F. Aubeneau, D. Leong, S. Patil, R. Schumer and A. I. Packman

      Version of Record online: 11 AUG 2012 | DOI: 10.1029/2012JG002019

      Key Points

      • Solute breakthrough curves are often not well characterized in tracer studies
      • Truncation miscalculates solute retention and overestimates biogeochemical rates
      • Improved design of tracer injection experiments can minimize tail truncation
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      Incorporating spatial variation of nitrification and denitrification rates into whole-lake nitrogen dynamics

      Denise A. Bruesewitz, Jennifer L. Tank and Stephen K. Hamilton

      Version of Record online: 8 AUG 2012 | DOI: 10.1029/2012JG002006

      Key Points

      • We know little about how N transformations vary spatially within a lake
      • Nitrification rates were comparable at all depths
      • The shallow edges of a lake are hotspots for denitrification
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      Exploring the role of organic matter accumulation on delta evolution

      Jorge Lorenzo-Trueba, Vaughan R. Voller, Chris Paola, Robert R. Twilley and Azure E. Bevington

      Version of Record online: 20 JUL 2012 | DOI: 10.1029/2012JF002339

      Key Points

      • First land building model coupling physical and biogeochemical processes
      • A quantitative prediction of field observed patterns of organic fraction
      • Demonstration of the role of fresh water supply in delta dynamics
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      Measuring aerobic respiration in stream ecosystems using the resazurin-resorufin system

      Ricardo González-Pinzón, Roy Haggerty and David D. Myrold

      Version of Record online: 19 JUL 2012 | DOI: 10.1029/2012JG001965

      Key Points

      • The smart tracer resazurin (Raz) can be used to measure aerobic respiration
      • Raz was correlated with aerobic respiration in pure culture and field tests
      • Raz can be used to measure respiration in situ and in vivo in stream ecosystems
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      In-stream net uptake regulates inorganic nitrogen export from catchments under base flow conditions

      Susana Bernal, Daniel von Schiller, Eugènia Martí and Francesc Sabater

      Version of Record online: 12 JUL 2012 | DOI: 10.1029/2012JG001985

      Key Points

      • Streams can act either as net DIN sinks or net DIN sources, or be at steady state
      • In-stream net DIN uptake does not correlate with key environmental factors
      • Stream network retention can reduce annual catchment DIN export by 4%-38%
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      Hydrologic connectivity increases denitrification in the hyporheic zone and restored floodplains of an agricultural stream

      Sarah S. Roley, Jennifer L. Tank and Maureen A. Williams

      Version of Record online: 10 JUL 2012 | DOI: 10.1029/2012JG001950

      Key Points

      • The hyporheic zone has high denitrification rates when connected to surfacewater
      • Denitrification rates increase during floodplain inundation
      • Ecotones have substantial N-removal potential in agricultural streams
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      A conceptual model for the blooming behavior and persistence of the benthic mat-forming diatomDidymosphenia geminata in oligotrophic streams

      James D. S. Cullis, Carole-Anne Gillis, Max L. Bothwell, Cathy Kilroy, Aaron Packman and Marwan Hassan

      Version of Record online: 9 JUN 2012 | DOI: 10.1029/2011JG001891

      Key Points

      • Synthesis of existing information on ecology of D. geminata
      • Develop conceptual model for ecology of the stalk forming diatom D. geminata
      • Recommendations for future research and potential mitigation options
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      Lakes as buffers of stream dissolved organic matter (DOM) variability: Temporal patterns of DOM characteristics in mountain stream-lake systems

      Keli J. Goodman, Michelle A. Baker and Wayne A. Wurtsbaugh

      Version of Record online: 29 NOV 2011 | DOI: 10.1029/2011JG001709

      Key Points

      • Lakes buffer subapline stream DOM temporal variability
      • Role of lakes on DOM dynamic switches across seasons
      • Subalpine lakes act as a DOM sink during spring and a DOM source during summer