Figure 4: Changes of plant and microbial properties with increasing AI.
From: Aridity threshold in controlling ecosystem nitrogen cycling in arid and semi-arid grasslands
Above-ground net primary production (ANPP) was correlated positively with aridity index (AI; a). Relationships below and above the threshold AI=0.32 were different for the standardized signal intensity based on array probes (c), standardized signal intensity in terms of both array probes and DNA concentrations in a gram of soil (b) and metabolic quotient qCO2 (d).
