In spring, as the rising of solar radiation and air temperature,
GPP and ET increased (Fig. 4a). GPP peaked in May for 2006,
2009 and 2010, in July for 2007 and 2008. The monthly maximum
for GPP ranged between 173.5 and 218.5 g C m2 month1.ET peaked in May in the 5-year experiment period, with the values
varying from 83.1 to 110.8 kg H2Om2 month1. Compared with
May, solar radiation and air temperature were higher in June, but
GPP and ET were lower in the mixed plantation ecosystem (Figs. 2
and 4).