OM in Water

16 important questions on OM in Water

What does is mean if the hydrophilic compounds have higher mobilization?

They get faster out of the system.

How is soil OM composition controlled?

By adsorption/stabilization vs dissolution/ decomposition.

What happens with DOC if bacteria consume it? (two things)


1.  Incorporate it into biomass (see above), or
2. Respire it as CO2
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If the age of POC is modern (0 to 1000 yrs), what type of mobilization method can you expect?


Overland flow or surface runoff

If the age of POC is modern or aged (10000 to 20000 yrs), what type of mobilization method can you expect?

River bank erosion

What is the exception of mobilization method

River bank erosion in permafrost landscapes.

What is the function and fate of POC? (four things)


1. Provides surface area for bacteria (important for ecosystem metabolism)
2. Some POC is quickly degraded (plankton source, fresh plant material)
3. POC is often bound to mineral surfaces in sediment
4. Large fraction of river POC is buried in the (coastal) ocean

What is the largest component of the dissolved organic matter pool?

DOC

Where is allochthonous DOC and POC derived from?

Watershed inputs (typically a lot)

Where is autochthonous DOC and POC derived from?

Within stream production (less)

What is the primary food source for bacteria?

DOC

Why are rivers almost always supersaturated with CO2?

Because bacteria consume it and then respire it as CO2.

What does petrogenic and biosheric means if its used as a division for POC?

Petrogenic means it comes from rocks and it's very old. Biosheric means it's from living matter and usually young.

What does EEMs mean and how can it be used?

Excitation-Emission Matrices. It can be used to visualize the main components of OM.

What is a good predictor of DOC concentration?

A254

What are the three steps in measuring the degradation of OC?

1. Measure C loss
2. Measure CO2 or CH4 production
3. Measure O2 loss

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