Abstrakt
We assessed human impacts on ecosystems by calculating the proportion of aboveground net primary production appropriated by humans (aHANPP) in the territory of the Czech Republic. The human appropriation of aboveground net primary production reached 21.5 Tg C per year in 2006 or 56% of the annual potential natural productivity.
Harvested productivity equivalent aNPPH is contributing to the overall appropriation of photosynthetic production by 80%. Considerable productivity losses have been induced by agricultural land conversion and urbanization.
While artificial surfaces are responsible for the appropriation of whole ecosystem production, productivity of urban green areas and managed forests can even exceed natural productivity levels. In the period 1990-2000, the aHANPP dropped by 7%, but the indicator shows an increase by over 2% in the period 2000-2006.
The indicator of human appropriation of net primary production enables translation of land cover changes into measures of ecosystem services affected by human activities. We found aHANPP to be a suitable indicator of human impacts on ecosystems, as it detects trends and enables spatial mapping of human impacts.