نتایج جستجو برای: dissolved organic carbon doc

تعداد نتایج: 474717  

Journal: :Global change biology 2015
José L J Ledesma Thomas Grabs Kevin H Bishop Sherry L Schiff Stephan J Köhler

Boreal regions store most of the global terrestrial carbon, which can be transferred as dissolved organic carbon (DOC) to inland waters with implications for both aquatic ecology and carbon budgets. Headwater riparian zones (RZ) are important sources of DOC, and often just a narrow 'dominant source layer' (DSL) within the riparian profile is responsible for most of the DOC export. Two important...

2006
Ragnar Elmgren

The use of riverine allochthonous organic matter by plankton in the northern Baltic Sea was studied using stable isotopes of carbon and nitrogen. Dissolved and particulate material was sampled in the main Swedish rivers entering the Bothnian Bay and the Bothnian Sea. At 4 sea stations, dissolved matter, plankton and nekton were sampled in l l size-classes: below 0.7 pm filtrate, 0.7-5, 5-20, 20...

2002
P Zieliñski A Górniak T Suchowolec

Chemical composition of water and dissolved organic carbon (DOC) levels were investigated over three years, along two large rivers in NE Poland, with different hydrological regimes. One river was from lakeland and the second a typical lowland river with forests and high contributions of peatlands in the catchment. The study involved hydrological (specific runoff, river discharge) effects on the...

2005

2. The dissolved-phase fraction (fdissolved) is a function of the characteristics and level of suspended solids and dissolved organic matter, which may be estimated from the following relationship, where [SS] is suspended solid content, [DOC] is DOC concentration, kd is partition coefficient between the dissolved phase and the suspended solids, and kDOC is the partition coefficient between the ...

2008
Yihua Cai Laodong Guo Thomas A. Douglas

Water samples were collected biweekly from the Chena River, Alaska, during 2005–2006 for analysis of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), total dissolved carbohydrate (TCHO), including monosaccharide (MCHO) and polysaccharide (PCHO), particulate organic carbon (POC) and its isotopic compositions, and Si(OH)4. Carbon species exhibit strong temporal variations with el...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Christopher L Follett Daniel J Repeta Daniel H Rothman Li Xu Chiara Santinelli

Marine dissolved organic carbon (DOC) is a large (660 Pg C) reactive carbon reservoir that mediates the oceanic microbial food web and interacts with climate on both short and long timescales. Carbon isotopic content provides information on the DOC source via δ(13)C and age via Δ(14)C. Bulk isotope measurements suggest a microbially sourced DOC reservoir with two distinct components of differin...

2012
Michael T. Brett George B. Arhonditsis Sudeep Chandra Martin J. Kainz

Many studies have concluded terrestrial carbon inputs contribute 20-70% of the carbon supporting zooplankton and fish production in lakes. Conversely, it is also known that terrestrial carbon inputs are of very low nutritional quality and phytoplankton are strongly preferentially utilized by zooplankton. Because of its low quality, substantial terrestrial support of zooplankton production in la...

Journal: :Journal of contaminant hydrology 2002
L Hrapovic R K Rowe

Volatile fatty acids (VFAs) represent the major organic constituent of landfill leachate and provide the greatest potential for leachate induced organic contamination of groundwater (e.g. as represented by an increase in the concentration of dissolved organic carbon and chemical oxygen demand). Long-term diffusion tests were performed for laboratory-compacted clayey soil plugs exposed to contin...

2003
Paul C. Hanson Darren L. Bade Stephen R. Carpenter Timothy K. Kratz

Recent literature has suggested that for many lakes and rivers, the respiratory breakdown of organic matter (R) exceeds production of organic matter by photosynthesis (gross primary production [GPP]) within the water body. This metabolic balance (GPP , R; ‘‘heterotrophy’’) implies that allochthonous organic matter supports a portion of the aquatic ecosystem’s respiration. Evidence that many lak...

2013
E. Fouilland M. Bouvy E. Le Floc'h J.-L. Gonzalez E. Hatey S. Mas B. Mostajir E. Rochelle-Newall C. Rodier C. Roques C. Salles

Over half of the total nitrogen, phosphorus, silicate and dissolved organic carbon (DOC) loading was discharged from the Vène River into the Thau Lagoon waters within the first five days of what was considered to be the autumn flash flood period. Such loads represented about 8% and 3% of the yearly averaged total nitrogen and phosphorus load in Thau Lagoon, respectively. Although this event aff...

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