Size and frequency of natural forest disturbances and the Amazon forest carbon balance
Abstract
Forest inventory studies in the Amazon indicate a large terrestrial carbon sink. However, field plots may fail to represent forest mortality processes at landscape-scales of tropical forests. Here we characterize the frequency distribution of disturbance events in natural forests from 0.01 ha to 2,651 ha size throughout Amazonia using a novel combination of forest inventory, airborne lidar and satellite remote sensing data. We find that small-scale mortality events are responsible for aboveground biomass losses of ~1.7 Pg C y-1 over the entire Amazon region. We also find that intermediate-scale disturbances account for losses of ~0.2 Pg C y-1, and that the largest-scale disturbances as a result of blow-downs only account for losses of ~0.004 Pg C y-1. Simulation of growth and mortality indicates that even when all carbon losses from intermediate and large-scale disturbances are considered, these are outweighed by the net biomass accumulation by tree growth, supporting the inference of an Amazon carbon sink.
- Publication:
-
Nature Communications
- Pub Date:
- March 2014
- DOI:
- 10.1038/ncomms4434
- Bibcode:
- 2014NatCo...5.3434E