The response of plant gas exchange to the changing climate
will determine how vegetation contributes to the global
carbon sink in the future (Canadell & Raupach 2008).
Recent findings suggest a decline in global land evaporation
trend due to soil moisture limitation in Southern
hemisphere (Jung et al. 2010) with potentially important
consequences to the entire earth system. Climate and atmospheric
composition influence the driving gradients of
the linked carbon dioxide and water vapour fluxes at the
vegetation-atmosphere interface (Nemani et al. 2003).
Plants also regulate this gas exchange and depletion of soil