Tool Tree Growth Season
The 'Tree Growth Season' tool estimates the potential number of days suitable for tree growth as well as the average temperature for these days. The estimation needs monthly data of mean, minimum, and maximum temperature and precipitation. Internally a soil water balance model is run on a daily basis. Using the given thresholds a relative tree line height can optionally be estimated.
References
- (2014): A climate-based model to predict potential treeline position around the globe. online.
- Author: O.Conrad, L.Landschreiber (c) 2016
- Menu: Climate|Bioclimatology
Parameters
Name | Type | Identifier | Description | Constraints | |
---|---|---|---|---|---|
Input | Mean Temperature | Grid list (input) | T | - | - |
Minimum Temperature | Grid list (input) | TMIN | - | - | |
Maximum Temperature | Grid list (input) | TMAX | - | - | |
Precipitation | Grid list (input) | P | - | - | |
Soil Water Capacity of Profile (*) | Grid (optional input) | SWC | Total soil water capacity (mm H2O). | - | |
Output | Mean Temperature | Grid (output) | SMT | Mean temperature of the growing season. | - |
Length | Grid (output) | LGS | Number of days of the growing season. | - | |
First Growing Day (*) | Grid (optional output) | FIRST | First growing day of the year (1-365). | - | |
Last Growing Day (*) | Grid (optional output) | LAST | Last degree day of the year (1-365). | - | |
Tree Line Height (*) | Grid (optional output) | TLH | Estimated relative tree line height. | - | |
Options | Grid system | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
Default | Floating point | SWC_DEFAULT | default value if no grid has been selected | Minimum: 0.000000 Default: 220.000000 | |
Top Soil Water Capacity | Floating point | SWC_SURFACE | - | Minimum: 0.000000 Default: 10.000000 | |
Transpiration Resistance | Floating point | SW1_RESIST | - | Minimum: 0.100000 Default: 1.000000 | |
Default Latitude | Floating point | LAT_DEF | - | Minimum: -90.000000 Maximum: 90.000000 Default: 50.000000 | |
Threshold Temperature | Floating point | DT_MIN | Threshold temperature (C) that constrains the growing season. | Default: 0.900000 | |
Minimum Soil Water Content (Percent) | Floating point | SW_MIN | - | Minimum: 0.000000 Default: 2.000000 | |
Minimum Length | Integer | LGS_MIN | Minimum length (days) of the growing season. | Minimum: 1 Default: 94 | |
Minimum Mean Temperature | Floating point | SMT_MIN | Minimum mean temperature (C) for all days of the growing season. | Default: 6.400000 | |
Maximum Tree Line Height Difference | Floating point | TLH_MAX_DIFF | - | Minimum: 0.000000 Default: 1000.000000 | |
(*) optional |
Command-line
Usage: saga_cmd climate_tools 11 [-T <str>] [-TMIN <str>] [-TMAX <str>] [-P <str>] [-SWC <str>] [-SWC_DEFAULT <double>] [-SWC_SURFACE <double>] [-SW1_RESIST <double>] [-LAT_DEF <double>] [-SMT <str>] [-LGS <str>] [-FIRST <str>] [-LAST <str>] [-TLH <str>] [-DT_MIN <double>] [-SW_MIN <double>] [-LGS_MIN <num>] [-SMT_MIN <double>] [-TLH_MAX_DIFF <double>] -T:<str> Mean Temperature Grid list (input) -TMIN:<str> Minimum Temperature Grid list (input) -TMAX:<str> Maximum Temperature Grid list (input) -P:<str> Precipitation Grid list (input) -SWC:<str> Soil Water Capacity of Profile Grid (optional input) -SWC_DEFAULT:<double> Default Floating point Minimum: 0.000000 Default: 220.000000 -SWC_SURFACE:<double> Top Soil Water Capacity Floating point Minimum: 0.000000 Default: 10.000000 -SW1_RESIST:<double> Transpiration Resistance Floating point Minimum: 0.100000 Default: 1.000000 -LAT_DEF:<double> Default Latitude Floating point Minimum: -90.000000 Maximum: 90.000000 Default: 50.000000 -SMT:<str> Mean Temperature Grid (output) -LGS:<str> Length Grid (output) -FIRST:<str> First Growing Day Grid (optional output) -LAST:<str> Last Growing Day Grid (optional output) -TLH:<str> Tree Line Height Grid (optional output) -DT_MIN:<double> Threshold Temperature Floating point Default: 0.900000 -SW_MIN:<double> Minimum Soil Water Content (Percent) Floating point Minimum: 0.000000 Default: 2.000000 -LGS_MIN:<num> Minimum Length Integer Minimum: 1 Default: 94 -SMT_MIN:<double> Minimum Mean Temperature Floating point Default: 6.400000 -TLH_MAX_DIFF:<double> Maximum Tree Line Height Difference Floating point Minimum: 0.000000 Default: 1000.000000