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env.in
env.in contains input parameters relating to the environment. These parameters affect temperature, temperature growth modifiers, and precipitation. There are also some parameters related to disturbances, specifically disturbances caused by animals.
click here to skip to an example file with values derived from scientific publications
STEPWAT2 expects this file to contain six lines of input with each line containing a varying number of parameters separated by at least one space. Any line beginning with a # will be ignored, Meaning you can add unlimited comments to the file. The parameters, in the order that them must appear, are
(average precipitation) (standard deviation of precipitation) (minimum precipitation) (maximum precipitation) (dry year) (wet year) (% precipitation during growing season) (transpiration window)
(average temperature) (standard deviation of temperature) (minimum temperature) (maximum temperature) (base growing temperature)
(Use fecal pats) (probability of pats) (probability that a pat will decompose) (slope for recolonization equation) (intercept for recolonization equation)
(use ant mounts) (probability of mounds) (minimum years before plants can reestablish) (maximum years before plants can reestablish)
(use animal burrows) (probability of burrows) (min years before reestablishment)
(cool season additive factor) (cool season slope for linear term) (cool season slope for quadratic term) (warm season additive factor) (warm season slope for linear term) (warm season slope for quadratic term)
The average precipitation in millimeters for a single year.
The standard deviation in millimeters for a single year.
The minimum precipitation in millimeters for a single year.
The maximum precipitation in millimeters for a single year.
A value in millimeters. Any year where total transpiration is less than or equal to this value will be treated as a dry year. See equation 3 in Coffin and Lauenroth 1990.
A value in millimeters. Any year where total transpiration is greater than or equal to this value will be treated as a wet year. Wet years negatively affect succulents. See equation 4 in Coffin and Lauenroth 1990.
The percent of precipitation that occurs during the growing season.
STEPWAT2 tracks the average transpiration of plants over a number of years to determine if the current year's transpiration is notably lower than average. If it is, a small amount of additional transpiration is made available to plants. This value controls the size of the transpiration window, meaning the number of past years over which the average is calculated.
The average temperature, in Celsius, of a single year.
The standard deviation, in Celsius, of a single year.
The minimum temperature, in Celsius, of a single year.
The maximum temperature, in Celsius, of a single year.
The lowest temperature, in Celsius, at which plants are allowed to grow.
Either 0 or 1.
- 1 will turn on fecal pats.
- 0 will turn off fecal pats.
The probability (between 0 and 1) that a fecal pat will occur in a single year.
The probability that a pat will decompose or be removed in year 1.
Slope of the equation used to determine time until recolonization. See equation 17 in Coffin and Lauenroth 1990.
Intercept of the equation used to determine time until recolonization. See equation 17 in Coffin and Lauenroth 1990.
Either 0 or 1.
- 1 will turn on ant mounds.
- 0 will turn off ant mounts.
Probability that an ant mound will occur in a single year.
Minimum years until plants can begin to reestablish.
Maximum years until plants can begin to reestablish.
Either 0 or 1.
- 1 will turn on animal burrows.
- 0 will turn off animal burrows.
Probability that an animal burrow will occur in a single year
Minimum number of years before plants can reestablish following an animal burrow disturbance.
Cool season additive factor. See equations 12 and 13 in Coffin and Lauenroth 1990.
Cool season slope for linear term. See equations 12 and 13 in Coffin and Lauenroth 1990.
Cool season slope for quadratic term. See equations 12 and 13 in Coffin and Lauenroth 1990.
Warm season additive factor. See equations 12 and 13 in Coffin and Lauenroth 1990.
Warm season slope for linear term. See equations 12 and 13 in Coffin and Lauenroth 1990.
Warm season slope for quadratic term. See equations 12 and 13 in Coffin and Lauenroth 1990.
446 79.4 286 714 376 526 .40 30
5.9 1.0 -22 22 4.4
0 .002 .025 0.0975 0.025
0 .00002 20 40
0 .000006 0
2 .1014 -.00257 -11 0.1014 -.00257
- Base growing temperature (4.4) described in Sims et al. 1978 Journal of Ecology
- All values for fecal pats, ant mounds, and animal burrows come from Coffin and Lauenroth 1990.
- All values for temperature-based growth modifiers come from Coffin and Lauenroth 1990.
Input Parameters
- rgroup.in
- species.in
- bmassflags.in
- env.in
- maxrgroupspecies.in
- model.in
- mortflags.in
- plot.in
- sxw.in
- sxwdebug.in