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Seasonal and diurnal variation in the co2 flux and co2—water flux ratio of alfalfa

✍ Scribed by Dennis D. Baldocchi; Shashi B. Verma; Norman J. Rosenberg

Publisher
Elsevier Science
Year
1981
Weight
736 KB
Volume
23
Category
Article
ISSN
0002-1571

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✦ Synopsis

The seasonal and diurnal variation of CO2 flux (F c ) and COs--water flux ratio (CWFR) of alfalfa were studied using micrometeorological techniques during the summer of 1978 at a location in the east central Great Plains.

Significant seasonal variation was found in both F c and CWFR. F c and CWFR were large in value during late spring. F c and CWFR decreased and reached a minimum during midsummer but recovered with the approach of fall.

F c was great during late spring as a result of optimal environmental conditions and the spring growth flush. The midsummer minimum in CO 2 flux appears to have been due to a reduced [CO s ] gradient between the chloroplast and atmosphere, to oxygen inhibition of CO s uptake and thermal pre-conditioning.

The diurnal course of F c was affected by irradiance and, possibly, by an accumulation of starch in the leaves. The diurnal course of CWFR was affected by net radiation and by sensible heat advection.

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