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  • equations: Table of allometric equations.

  • equations_metadata: Explanation of columns for equations table.

Usage

equations

equations_metadata

Format

An object of class spec_tbl_df (inherits from tbl_df, tbl, data.frame) with 570 rows and 47 columns.

An object of class spec_tbl_df (inherits from tbl_df, tbl, data.frame) with 47 rows and 7 columns.

Source

See references for equations original sources.

Details

A compilation of best available allometry equations to calculate tree above-ground biomass (AGB) per species based on extratropical ForestGEO sites.

See also

Other database datasets: missing_values, references, sites_info, sitespecies

Examples

# preview the datasets
print(head(equations))
#> # A tibble: 6 × 47
#>   ref_id equat…¹ equat…² equat…³ depen…⁴ indep…⁵ equat…⁶ allom…⁷ equat…⁸ geogr…⁹
#>   <chr>  <chr>   <chr>   <chr>   <chr>   <chr>   <chr>   <chr>   <chr>   <chr>  
#> 1 barne… 4b4063  exp(3.… exp(a+… Total … DBH     Picea … Species sp_spec Alaska…
#> 2 baske… e2c7c7  exp(0.… exp(a+… Total … DBH     Picea … Species sp_spec New Br…
#> 3 bohn_… e42e41  exp((1… exp((a… Total … DBH     Betula  Genus   generic Northe…
#> 4 bohn_… 2bc879  dbh/((… dbh((1… Height  DBH     Betula  Genus   generic Northe…
#> 5 bohn_… 9f138f  exp((1… exp((a… Total … DBH     Fagus   Genus   generic Northe…
#> 6 bohn_… 7a3dce  dbh/((… dbh((1… Height  DBH     Fagus   Genus   generic Northe…
#> # … with 37 more variables: original_coord <chr>, lat <chr>, long <chr>,
#> #   elev_m <chr>, geography_notes <chr>, mat_C <chr>, min.temp_C <chr>,
#> #   max.temp_C <chr>, map_mm <chr>, frost_free_period_days <chr>,
#> #   climate_notes <chr>, stand_age_range_yr <chr>, stand_age_history <chr>,
#> #   stand_basal_area_m2_ha <chr>, stand_trees_ha <chr>,
#> #   forest_description <chr>, ecosystem_type <chr>, koppen <chr>,
#> #   dbh_min_cm <chr>, dbh_max_cm <chr>, sample_size <chr>, …
print(head(equations_metadata))
#> # A tibble: 6 × 7
#>   Column Field                Description            Colum…¹ Field…² Units Range
#>   <chr>  <chr>                <chr>                  <chr>   <chr>   <chr> <chr>
#> 1 1 / A  ref_id               Unique reference iden… charac… NA      NA    NA   
#> 2 2 / B  equation_id          Unique equation ident… charac… NA      NA    NA   
#> 3 3 / C  equation_allometry   Equation to calculate… charac… NA      NA    NA   
#> 4 4 / D  equation_form        Algebraic form of the… charac… NA      NA    NA   
#> 5 5 / E  dependent_variable   Tree component charac… charac… NA      NA    NA   
#> 6 6 / F  independent_variable Parameters included i… charac… NA      mm, … NA   
#> # … with abbreviated variable names ¹​Column_type, ²​Field_codes