In order to better
understand the regional climate change, it is necessary to quantify the CO2
flux over agricultural landscapes. CO2 fluxes were collected
directly by using eddy covariance over two different underlying surfaces (i.e.,
a rice paddy, and a mixed crop surface) in an agricultural landscape in the
central China
over two periods of 40 days in 2001 and 2002 respectively, in which significant
plant growth occurred. Results show (1) that daytime absorption of CO2
flux by the rice paddy gradually increased but nighttime release of CO2
flux by the rice paddy did not; (2) that, for both rice paddy and mixed crop
surface, daytime absorption of CO2 significantly increased after
rain events, but nighttime release of CO2 almost did not change; and
(3) that maximum diurnally daytime absorption of CO2 reached 6 g m-2
h-1 over rice paddy and 2.8 g m-2 h-1
over the mixed crop surface respectively
Author: Z. Gao, and L.Bian (zgao at cams dot cma dot gov dot cn)
Filesize: 228.65 Kb