CO2
CO2 Uptake Versus Concentration Data
Description
Measurements of the CO2 uptake for six Echinochloa crus-galli plants
from Quebec and six plants from Mississippi as a function of ambient
CO2 concentration. Half the plants of each type were chilled
before the measurements were taken.
Usage
data(CO2)
Format
This data frame contains the following columns:
Value
| Plant |
a factor giving a unique identifier for each plant.
|
| Type |
origin of the plant - Quebec or Mississippi.
|
| Treatment |
treatment - chilled or nonchilled.
|
| conc |
ambient concentration of carbon dioxide (mL/L).
|
| uptake |
CO2 uptake (umol/m^2 sec).
|
Source
These data are given in Potvin, C. and Lechowicz, M.J. (1990), "The
statistical analysis of ecophysiological response curves obtained from
experiments involving repeated measures",
Ecology,
71, 1389--1400.
Examples
CO2.lis <- nlsList(uptake ~ CO2.func(conc, A, c0, lrc),
data = CO2, cluster = ~ Plant)
CO2.nlme <- nlme(CO2.lis)