Biogeochemical cycling and pollutant exposure in dry desert tropical ecosystems

Biogeochemical Cycling and Pollutant Exposure in Dry Desert Tropical Ecosystems 

Dry desert tropical ecosystems occupy 4.5 x 106 km2, or 3.0% of total land area of the Earth. These ecosystems have dry periods during 7-10 months a year. Not only trees, but also numerous grasses cannot grow in such severe conditions. The vegetation 

Heavy metals Content, ppm Coefficient of biogeochemical uptake, Cb Averaged annual flux, kg/ha 

We can see that trees are major contributors to the plant biomass of this ecosystem. They account for 60% of the root and 98% of the aboveground biomass. The monitoring results showed also that the grasses provide a larger part of the annual 

Content of chemical species in main parts of annual NPP 

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