Unit NPP Total NPP ocean total upwelling open ocean coastal ocean coastal ocean open ocean upwelling terrestrial total wetland cultivated Biome tropical wet forest tropical savannah tropical wet forest cultivated temperate forest tropical dry forest tropical savannah boreal forest temperate forest temperate steppe tropical dry forest boreal forest temperate steppe wetland tundra tundra desert 0 200 desert 400 600 800 1000 2 NPP g C m yr 1200 1400 1600 0 10 20 30 40 NPP Pg C yr 50 60 70 80 001 100 001 a DEPTH 2 r 0 559 b AGE 2 r 0 328 c PO ROSITY 2 r 0 194 90 01 80 01 70 Porosity 1 Age mya Depth mbsf 1 1 60 50 40 1 10 30 20 10 100 10 1000 0 100 0 2 4 6 8 10 12 0 2 6 8 10 12 Log10 bacterial umbers n cells cm3 Log10 bacterial umbers n cells cm3 Log aodc 7 98 0 57 log depth r2 0 559 n 822 t 32 24 P 0 001 4 r2 Log aodc 6 93 0 4 ge log a 0 328 n 536 t 16 13 P 0 001 0 2 4 6 8 10 12 Log10 bacterial umbers n cells cm3 Log aodc 0 28 3 80 logosity por r2 0 194 n 736 t 13 29 P 0 001 J Parkes B Cragg P Wellsbury 2000 Recent studies on bacterial populations and processes in subseafloor sediments A review Hydrogeology Journal 8 11 28
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