equations: Table of allometric equations.
equations_metadata: Explanation of columns for equations table.
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 ¹Column_type, ²Field_codes