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Fig. 2. Relationship between soil immunoreactive soil protein (IRSP) and net primary productivity (NPP) in ecosystems from various biomes in North America, South America, Europe, and the Pacific Islands. Immunoreactive soil protein and NPP were significantly correlated (P = 0.0014). Each symbol represents one ecosystem (Table 1): A = agricultural; B = boreal forest; D = desert; TF = temperate forest; TG = temperate grassland; TR = tropical forest (note log–log axes).
