Dataset S1.csv

A meta data from literature which met the following criteria: (1) the climatic, soil, and vegetation variables (or conditions) were the same between the control and the N addition treatment sites (i.e. studies along gradients of N deposition were not considered); (2) the research only included species that naturally exist in terrestrial habitats; (3) means, standard deviations (SDs), or errors (SEs), and the sampling sizes for both the control and treatment groups could be directly obtained or could be calculated; (4) the statistical assumption of independence across observations for the long-term N addition study were met and, only the most recent results were included; (5) only data from control and N addition plots were collected when global change treatments other than N addition e.g. added CO2 or increased temperature were tested; (6) data from transgenic plants or plants that had been handled with herbicides, hormones, and/or heavy metals were eliminated since they might have presented a different pattern of biomass distribution. We compiled a database from 255 published articles, containing a total of 3,516 paired observations of 401 terrestrial plant species