Figure 4

(A–C). Correspondence analysis results between grazing intensity, ecosystem CO₂ fluxes and environment factors. Dim1, Dim2 and Dim3 represent for the eigenvectors of different grazing intensities and different indicators. Figure 4A is a correspondence analytical figure of Dim 1 and Dim 2, and Fig. 4B is a correspondence analytical figure of Dim 1 and Dim 3. Figure 4C is a correspondence analytical figure of Dim 2 and Dim 3. In the figure, G00, G10, G20, G30, G40 and G50 refer to the 6 treatments in 2010; G01, G11, G21, G31, G41 and G51 refer to the treatments in 2011; G02, G12, G22, G32, G42, G52 refer to the treatments in 2012; G03, G13, G23, G33, G43, G53 refer to the treatments in 2013; and G04, G14, G24, G34, G44 and G54 refer to the treatments in 2014. The red circles denote the variables included in the diagram. CO₂ represents the ecosystem CO₂ fluxes. The climate factors are R (rainfall) and T (air temperature). The plant community variables are AGB (aboveground biomass), C (coverage), H (height), BGB (belowground biomass) and L (litter). The soil environment variables are SBD (soil bulk density), pH and SM (soil moisture). The soil nutrient variables are SOC (soil organic carbon), TN (total nitrogen), TP (total phosphorus), TK (total potassium), SAN (soil available nitrogen), SAP (soil available phosphorus), SAK (soil available potassium), C/N (carbon to nitrogen ratio), NH₄ ⁺ (soil NH₄ ⁺-N) and NO₃ ⁻ (soil NO₃ ⁻N).