Abstract ID: 213

‘An analysis of annual cycles in daily carbon and water fluxes in four Amazon forests’

Bart Kruijt, Alessandro Araujo, Celso von Randow, Fabricio Zanchi, Renata Goncalvez, Jair Maia, Scott Saleska, Yadvidner Malhi, Antonio Manzi, Antonio Nobre, Javier Tomassella, Martin Hodnett There have been several discussions on the magnitude and causes of seasonality in Amazon rain forests. In the Central Amazon, seasonality seems to be absent or ecosystem fluxes are highest in the dry seasons. In more peripheral sites the opposite is true. Yet, in all systems, the annual cycles can only partly be explained from direct environmental factors. In this paper, we will explore from the multi-annual eddy correlation time series in at least four sites (Manaus, Rebio Jaru, Tapajos and Caxiuana) to what extent either water stress or radiative input can explain the annual cycles. We will critically explore the capacity of both rooting system and foliage to explore the available resources, and see whether annual growth patterns can help in explaining the observations.

Session:  Carbon - The role of seasonality in carbon and water balance.

Presentation Type:  Oral