Code and example data for fitting density-yield functions for carbon stocks or biodiversity and agricultural yields
These data and the accompanying R script were used in the analysis for Williams et al (2018) Carbon storage and land-use strategies in agricultural landscapes across three continents Current Biology https://doi.org/10.1016/j.cub.2018.05.087 The script fits two forms of density-yield curves to the data, describing how aboveground carbon stocks vary with changes in agricultural yield. It then allows users to choose between the curves based on log-likelihood, as well as plotting the curves and constraining fits if necessary. The same method can be used for species population densities (see e.g. Green et al 2005 Science; Phalan et al 2011 Science; Kamp et al 2015 J App. Eco).
Steps to reproduce
The R script should be self-contained (please contact David Williams if not) and relies on few packages. Detailed descriptions of the data collection are described in the accompanying paper: Williams et al (2018) Carbon storage and land-use strategies in agricultural landscapes across three continents Current Biology https://doi.org/10.1016/j.cub.2018.05.087