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Estimating and scaling stream ecosystem metabolism along channels with heterogeneous substrate
Author(s) -
Hondzo Miki,
Voller Vaughan R.,
Morris Mark,
FoufoulaGeorgiou Efi,
Finlay Jacques,
Ganti Vamsi,
Power Mary E.
Publication year - 2013
Publication title -
ecohydrology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.982
H-Index - 54
eISSN - 1936-0592
pISSN - 1936-0584
DOI - 10.1002/eco.1391
Subject(s) - environmental science , primary production , ecosystem , hydrology (agriculture) , ecosystem respiration , ecology , atmospheric sciences , soil science , biology , geology , geotechnical engineering
Measured diurnal curves of dissolved oxygen (DO) concentration have been used to estimate the gross primary production (GPP), ecosystem respiration (R), and net ecosystem production (NP) of aquatic communities. Open‐system one‐station and two‐station methods have been employed to estimate the rate of NP, R, and GPP. We conducted field measurements in Minnehaha Creek, MN (44 o 56'N, 93 o 28'W), to quantify the spatial and temporal variabilities of DO concentrations and, consequently, evaluated the estimates of NP. Dimensionless analysis of DO mass balance revealed the dominance of local photosynthesis over respiration, advection, re‐aeration, and dispersion along the studied reach. Two alternative estimation methods of stream metabolism provided similar estimates of NP with 0.65 > k a T a > 0.17 within the studied reach where k a is the re‐aeration rate and T a is the water parcel average travel time. The spatial variability of DO change along the creek revealed an average length scale of 10 m over which DO exhibited significant autocorrelation. The autotrophic–heterotrophic balance, quantified by GPP to R ratio, scaled with local stream geomorphic and hydraulic conditions from diverse geographic areas, providing useful predictive relationships expressed in terms of easily measurable abiotic parameters. Copyright © 2013 John Wiley & Sons, Ltd.