EcosystemProduction {StreamMetabolism}R Documentation

Calculate Ecosystem Production with the Single Station Method

Description

Calculates Ecosytem Production

Usage

EcosystemProduction(velocity, meandepth, temperature, DO, day, 
startday, endday, sunrise.time, sunset.time, num.readings)

Arguments

velocity velocity in meters/s
meandepth mean stream channel depth in meters
temperature temperature in degrees Celcius
DO Dissolved Oxygen in mg/L
day date of the day of interest must be in quotes
startday time of the start of the "day" usually 00:00:00 must be in quotes
endday time of the end of the "day" usually 23:45:00 must be in quotes
sunrise.time time of sunrise in the form "04:22:00" must be in quotes
sunset.time time of sunset in the form "19:23:00" must be in quotes
num.readings number of readings if data is collected in 15min intervals then there are 96 readings per day

Details

O'Conner Dobbins eauation is used to calculate Rearation coefficient. This function has only been tested with zoo objects read in with the read.production function. Should work for others, but untested. The values that are returned are only as good as the assumptions that went into collecting the data and should be viewed with scrutiny. Also the Reaeration coefficient is the most important number used in the calculation of Production and therefore needs to be as correct as possible. In the future (as the need arises- or enough requests come in) I plan on incorperating different ways of calculating this, but for now you are stuck with my assumptions for the task at hand.

Value

CR24 Community Repiration 24hours (sum of pre-dawn and post-dusk change in Oxygen curve corrected for Reaeration)
NDM Net Daily Metabolism (sum of total day change in Oxygen Curve corrected for Reaeration)
abs.CR24 absolute value of Community Repiration 24hours (because CR24 is always negative)
GPP Gross Primary Productivity=NDM+abs.CR24
P.R P/R ratio
Units areal units (gOxygen/squared meter/day) of everything except P.R which is unitless

Author(s)

Stephen A Sefick Jr.

References

Odum, H. T. (1956). "Primary production in flowing waters." Limnology and Oceanography, 1: 102-117.

M.R. Grace and S.J. Imberger. 2006. "Stream Metabolism: Performing & Interpreting Measurements". Water Studies Centre Monash University, Murray Darling Basin Commission and New South Wales Department of Environment and Climate Change. 204 pp. Accessed at http://www.sci.monash.edu.au/wsc/docs/tech-manual-v3.pdf

Examples

#zoo real data
#velocity 0.6
#depth 0.4572
#sunrise 6:00AM
#sunset 8:15PM
#96 is the number of intervals in a day for fifteen minute data
data(DOTemp)
prod <- EcosystemProduction(0.6, 0.4572, 
DOTemp[,1], 
DOTemp[,2], "8/18/70", "00:00:00", "23:45:00", "06:00:00", "20:15:00", 96)
prod

[Package StreamMetabolism version 0.03-1 Index]