Figure 5
Redundancy analyses (RDA) of environmental effects (blue arrows) on chlorophyll concentrations (red diamonds) for (a–c) three plateaus and (d) entire northern hemispheric grassland. Chl: chlorophyll, PAR: photosynthetically active radiation, MAP mean annual precipitation, MAT mean annual temperature, NP the ratio of soil nitrogen to phosphorus. Significance is denoted by asterisks (p < 0.001***, p < 0.01**, p < 0.05*). Numbers in parentheses are the R2 values of factors, and the factors with the largest R2 values are in blue.
