This repository contains the leaf Nmass, Pmass, and N:P data (data/leafnp_tian_et_al.csv), based on Tian et al. (2019), complemented by environmental covariates. The code for complementing the original data by Tian et al. (2019) is contained in this repository and is used for the analysis and modelling for the article Tian et al. (in prep.). Code for the data analysis and modelling is contained in a separate repository leafnp.

To reproduce the data generation, follow these steps:

1. Obtain the original data from Tian et al. (2019) (follow link provided therein) and place it locally. In code used here, the file is lives at data-raw/global_leaf_NP_total_Di_20210224.csv.
2. Complement data: analysis/01_complement_environment.R (copied from leafnp/analysis/leafnp.R of the stineb/leafnp repository)
3. Complement missing environmental data: analysis/02_complement_environment_missing.R (copied from leafnp/analysis/leafnp_complement_missing.R of the stineb/leafnp repository)

The code relies on the custom R package {ingestr}. Install it from github, available here.

The final file, produced and contained by this repository, is:

data/leafnp_tian_et_al.csv

Contains scripts (see Workflow above).

Contains files needed to compile the final file.

Contains files produced by code of this repo (files not contained by this repo).

Contains a vignette showcasing the data.

Tian, D., Kattge, J., Chen, Y., Han, W., Luo, Y., He, J., Hu, H., Tang, Z., Ma, S., Yan, Z., Lin, Q., Schmid, B., and Fang, J.: A global database of paired leaf nitrogen and phosphorus concentrations of terrestrial plants, Ecology, 100, e02812, https://doi.org/10.1002/ecy.2812, 2019.

Di Tian, Zhengbing Yan, Bernhard Schmid, Jens Kattge, Jingyun Fang, Benjamin D. Stocker: Environmental versus phylogenetic controls on leaf nitrogen and phosphorous concentrations of terrestrial plants. (in review)