||This project aims to enhance an integrated understanding of socioeconomic as well as of natural drivers and implications of the global human use of terrestrial ecosystems. It is focused on one major integrated socio-ecological indicator, the human appropriation of net primary production (abbreviated HANPP). Other measures of human use of ecosystems will be investigated as well, including human-induced changes in nutrient flows (above all N).
HANPP is a spatially explicit indicator of socio-ecological metabolism that measures to what extent land conversion and biomass harvest alter the availability of trophic energy in ecosystems. HANPP is defined as the difference between the NPP of potential vegetation (NPP0) -- the vegetation that would prevail in the absence of human land use -- and the fraction of the NPP of the actually prevailing vegetation (NPPact) that remains in ecosystems after harvest. Two processes contribute to HANPP: (1) changes in NPP stemming from land conversion (dNPPLC) and (2) biomass withdrawal / harvest (NPPh).
The project aims at an improved understanding of the dynamic and complex interplay of society and nature that shapes spatial patterns as well as changes of land systems over time. It systematically analyzes spatial patterns and dynamics of global human use of ecosystems during the last 300 years, explores the underlying factors, mechanisms and determinants, and identifies drivers of change. It examines and quantifies the effects on patterns and processes in ecosystems, including biodiversity, flows and selected stocks of C and N, and interprets these results in the context of resilience and stability of ecosystems, on global, regional and national scales.
At present it includes the projects "Analyzing global HANPP" and GLOMETRA.