Comparing carbon fluxes between different stages of secondary succession of a karst grassland

▶ Paired NEE measurements of two chronosequences on heterogeneous karstic terrain. ▶ Heterogeneity of studied ecosystems due to soil conditions and vegetation structure. ▶ Woody-plant invaded ecosystem is substantial sink for CO2 compared with the pasture. ▶ Resource acquisition strategy of woody plants is reflected in changed yearly NEE course. ▶ Yet unexplained high C losses after the rain events in the cold period of the year.