Figure 4. Soil respiration and impact factors during the early growing season in three types of grasslands.

R_s is the soil respiration (A), ST is the soil temperature (B), SWC is the soil water content (C), SOC is the soil organic carbon content (D), TC is the soil total carbon content (E), TN is the soil total nitrogen content (F), C:N is the soil carbon-to-nitrogen ratio (G), MNDVI is multiyear averaged NDVI (H), and MLSWI is multiyear averaged LSWI (I).