[Prev][Next][Index]

Summary of work performed on carbon and nitrogen cycling at the VCR

Summary--Discussion of Outline for Synthesis Volume

Linda and I met on 10/3 to discuss organization of a chapter on nitrogen
and carbon cycling processes for the synthesis volume.  
The following is a listing of all the data sets that we could think of
that exist for the various ecosystems across the VCR. We would
appreciate any additions or corrections to the list.  

Hog Island

Terrestrial
	Beach grass--root standing stocks and turnover (Day)
	Beach Grass--root C/N ratios (Day)
	Beach Grass--above and below-ground productivity and turnover (Day)
	(Frank, do you have any data for forested areas?)

	Myrica above-ground productivity (new shoots) (Young)
	Myrica C/N ratios (Young)
	Myrica CO2 exchange (Young)
	Leaf litterfall--Myrica (total above-ground new productivity)-(Shao)
	Leaf decomposition (organic C and N input) --Myrica (Shao)

Marsh
	Above and below-ground productivity with effects of N and P
fertilization (Osgood)
	Nutrient standing stocks, extractable and pore water (Osgood) 
	Pore water nutrients--marsh chronosequence (Walsh) (Tyler) (Laird,
starting Oct 96)
	Above/below-ground biomass--marsh chronosequence (Walsh) (Laird)
	Below-ground decomposition and root production (Blum)
	Long-term intersite decomposition study (Blum)
	Nitrification and N-mineralization--marsh chronosequence (Laird,
starting Oct 96)

	Mainland

Upper Brownsville
	Above-ground biomass, production--inundation site (Tolley)
		Juncus
		Distychlis/S.patens
		S. alterniflora
	Below-ground production estimates--Juncus 
	Nitrification/Denitrification--inundation site (Taylor)
	C/N ratios--macrophytes (Christian)
	Sediment physico/chemical characterization (Taylor, Christian)
	15-N mineralization/nitrification (summer only)--inundation site
(Anderson)
	Nitrification--diel variation in creek and ponded areas (Tarnowski)
	Pore water salinity, nutrients--inundation site (Christian, Miller)
	CO2 exchange--gross/net macrophyte and microalgal
productivity--inundation site (Miller)
	CO2 production--sediment respiration --inundation site (Miller)
	Groundwater/hydrodynamics, salinity (Brinson)

Lower Brownsville (S. Alterniflora)
	Below-ground decomposition, root production (Blum)
	Above-ground decomposition (Blum)
	Long-term intersite decomposition study (Blum)
	Acetate mineralization (Blum)
	Acetate standing stocks (Blum)
	DOC standing stocks (Blum)
	Above-ground production (Morris)
	Above-ground macrophyte and microalgal biomass (chlorophyll a), C/N
(Anderson)
	Below-ground macro-organic matter, C/N (Anderson)
	Nutrient standing stocks, sediment C/N, physical parameters (Blum,
Anderson)
	Nitrification, mineralization, N-fixation, denitrification (Anderson)
	Rates of denitrification vs. Dissimilatory nitrate reduction to NH4+ in
sediment profile 	(Anderson/Tobias)
	Accretion/sediment input (Barr/Nuttle, Kastler/Wiberg, Christensen)
	Disturbances--agricultural inputs of nitrate (Macko/Tapper/McConnell,
Tobias)
	
Exchanges

Marsh/overyling water
	Nutrients, DOC, DON in Lower Brownsville/Phillips Creek (Neikirk,
Chambers)
	Nutrients in Cattleshed Creek and Phillips Creek (Wetzel- -Betty says
that data is there)

Tidal Creek
	Nutrients, DOC--Phillips Creek (Christian, Blum, Neikirk)

Lagoon
	Nutrients (Blum, Mills, Wetzel??, Christian)


	Data Available Across Landscapes

The GIS database includes mainland marshes, lagoon, barrier islands
(Porter, Callahan).
Nutrient standing stock data are available for all terrestrial,
lagoonal, marsh sites.
Sediment organic matter data is available for terrestrial, marsh, and
lagoonal sites.
Production data is available for marsh (above and below-ground),
terrestrial (above-ground), and
	lagoonal sites.
Sediment/water fluxes are available for marsh, tidal creek, and perhaps
lagoonal sites.


Given the above data, we can (we hope):
(1) calculate the carbon and nitrogen stored in different parts of the
landscape;
(2) calculate net gain or loss of C and N from different parts of the
landscape;
(3) compare calculated net gain or loss to measured exchanges of
nitrogen between mainland- creek--lagoon--islands.
(4) consider the effects of various disturbances on net gain, loss, and
exchanges of C and N.

As our first stab at a title for this chapter we suggest:
Controls on organic matter accumulation across a coastal lagoon
landscape

So---
(1) What data sets have we left out?
(2) Which can we realistically use?
(3) Any other thoughts on a theme to tie together the above information?
(4) What’s the next step??


	
	
	

	
	
	

	
	

> VCR LTER Synthesis Volume
> 
> ----------------------------------------------------------------------
> 
>    * Outline February 1996
>    * Send email to the Synthesis mailing group
>    * Synthesis mailing group mail archive
>    * Population, Community and Biodiversity Chapter
>    * Megasite Chapter