Continuous micrometeorological and stable isotopomer measurements were used to quantify seasonal changes in the isotope ratio of respired carbon from a corn-soybean system, examine the variation in source contribution to respiration, interpret seasonal variations in NEE and obtaining key biophysical parameters at the field scale. Strong seasonal variation in the isotope and canopy discrimination for a rotation ecosystem was observed. The seasonal variation of the variables was correlated with phenology showing rapid changes following leaf emergence and senescence. Results indicate that during the growing season R E was dominated by fixed Carbon dioxide.
|Original language||English (US)|
|Number of pages||3|
|State||Published - Dec 1 2004|
|Event||26th Conference on Agricultural and Forest Meteorology - Vancouver, BC, Canada|
Duration: Aug 23 2004 → Aug 26 2004
|Other||26th Conference on Agricultural and Forest Meteorology|
|Period||8/23/04 → 8/26/04|