Figure 1

Spatial patterns of Ndep in China (kg ha−1 a−1).
Spatial distribution maps of Ndep in the 1990s (a) and 2000s (b) were obtained from 136 and 144 monitoring sites, respectively, by Kriging interpolation. The letters denote the abbreviations of province names in China and the full names of the provinces are listed in Supplementary Table S1. The dots indicate the location of the capital of each province. The distribution of monitoring sites is shown in Supplementary Figure S2. The maps were generated using ArcGIS 10.0 software.