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

(2019): Why tree lines are lower on islands - Climatic and biogeographic effects hold the answer. online.
(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.	-
	Precipitation Sum (*)	Grid (optional output)	`SMP`	Precipitation sum 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: 30.000000
	Transpiration Resistance	Floating point	`SW1_RESIST`	-	Minimum: 0.010000 Default: 0.500000
	Default Latitude	Floating point	`LAT_DEF`	-	Minimum: -90.000000 Maximum: 90.000000 Default: 0.000000
	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: 3000.000000
(*) 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>] [-SMP <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: 30.000000
  -SW1_RESIST:<double>  	Transpiration Resistance
	Floating point
	Minimum: 0.010000
	Default: 0.500000
  -LAT_DEF:<double>     	Default Latitude
	Floating point
	Minimum: -90.000000
	Maximum: 90.000000
	Default: 0.000000
  -SMT:<str>            	Mean Temperature
	Grid (output)
  -SMP:<str>            	Precipitation Sum
	Grid (optional 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: 3000.000000