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).

本数据集及其配套的 R 脚本，被用于 Williams 等人于 2018 年发表的论文《横跨三大洲的农业景观碳储存与土地利用策略》的分析中，该论文发表于《Current Biology》期刊，DOI：https://doi.org/10.1016/j.cub.2018.05.087。该脚本将两种形式的密度-产量曲线拟合至数据，描述了地上碳储量如何随农业产量的变化而变化。随后，它允许用户基于对数似然比选择曲线，并在必要时绘制曲线和约束拟合。该方法同样适用于物种种群密度（例如，参见 Green 等人于 2005 年发表于《Science》的论文；Phalan 等人于 2011 年发表于《Science》的论文；Kamp 等人于 2015 年发表于《J App. Eco》的论文）。