Figure 4
From: Evolution of nitrogen cycling in regrowing Amazonian rainforest
Conceptual model of N cycling along a forest chronosequence in Amazon region, (a,b). Nitrogen pathways in regrowing forest soils of different ages after one time disturbance by slash-and-burn. In the early regrowth forest (10 years; a) a new source of labile N from the burning of biomass stimulates gross mineralization and, as consequence of investment in forest growth, higher N uptake by plants. Nitrification and N uptake receiving support from N mineralization in 20 and 40 years old regrowth forests (b). In pristine forest (c) root exudations stimulates mineralization, which supports nitrification. See text for more details.
