Dissolved Organic Carbon
Dissolved Organic Carbon - Related Videos
09:38
Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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Cited by 3 •
2016
Dissolved organic matter provides an important source of energy and nutrients to stream ecosystems. Here we demonstrate a field-based method to manipulate the ambient pool of dissolved organic matter in situ through easily replicable nutrient pulses.
12:46
Bromodeoxyuridine (BrdU) Labeling and Subsequent Fluorescence Activated Cell Sorting for Culture-independent Identification of Dissolved Organic Carbon-degrading Bacterioplankton
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Cited by 6 •
2011
Environmental bacterioplankton are incubated with a model dissolved organic carbon (DOC) compound and a DNA labeling reagent, bromodeoxyuridine (BrdU). Afterward, DOC-degrading cells are separated from the bulk community based on their elevated BrdU incorporation using fluorescence activated cell sorting (FACS). These cells are then identified by subsequent molecular analyses.
09:04
Assessment of Labile Organic Carbon in Soil Using Sequential Fumigation Incubation Procedures
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Cited by 4 •
2016
Labile organic carbon (LOC) and the potential carbon turnover rate are sensitive indicators of changes in soil nutrient cycling processes. Details are provided for a method based on fumigating and incubating soil in a series of cycles and using the CO2 accumulated during the incubation periods to estimate these parameters.
09:38
Dissolved Oxygen in Surface Water
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Dissolved oxygen (DO) measurements calculate the amount of gaseous oxygen dissolved in surface water, which is important to all oxygen-breathing life in river ecosystems, including fish species preferred for human consumption (e.g. bluegill and bass), as well as decomposer species critical to the recycling of biogeochemical materials in the system. The oxygen dissolved in lakes, rivers, and oceans is crucial for the...
01:14
The Carbon Cycle
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2019
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle. Biological Carbon Cycle All...
FAQs
DOC affects aquatic ecosystems in several linked ways. Its ability to absorb light can alter the underwater light environment, while its chemical transformations change water chemistry. These effects influence how energy and carbon are distributed through lakes, rivers, soils, and oceans. Consequently, DOC connects physical conditions with biological processes such as ecosystem productivity.
During microbial decomposition, organisms use DOC as an energy and carbon source while the material is chemically transformed. This processing changes the form in which carbon is available and helps determine how far it travels through connected environments. The balance among decomposition, transformation, and transport influences carbon movement across terrestrial, freshwater, and marine systems.
Plant residues, microbial activity, and runoff supply DOC to connected environments. These pathways link biological production and decomposition on land with carbon transport through freshwater and marine systems. Their influence means that changes in surrounding vegetation, microbial processes, or water movement can alter the amount and character of DOC reaching an ecosystem.
Filtration establishes the operational boundary for a DOC measurement by separating the carbon that passes through a filter from material retained by it. Using this boundary allows researchers to examine the dissolved fraction consistently across samples. The resulting measurements can then support assessments of ecosystem productivity, nutrient cycling, water quality, and carbon storage.
DOC measurements provide evidence about several interacting ecosystem processes. Biologists can use them to investigate productivity, nutrient cycling, and water quality, while also assessing how carbon is stored and transported. Because DOC responds to biological activity, chemical transformation, and runoff, its measurement helps connect local water conditions with broader ecosystem function.
DOC links carbon pools across terrestrial, freshwater, and marine environments, so environmental changes can affect both its movement and its transformation. Tracking this material helps researchers examine whether carbon is being transported, chemically altered, or retained within connected systems. That perspective supports biological studies of carbon storage and changing ecosystem conditions.