Title: Seasonal and diurnal variation in the co2 flux and co2—water flux ratio of alfalfa
Abstract: The seasonal and diurnal variation of CO2 flux (Fc) and CO2—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 Fc and CWFR. Fc and CWFR were large in value during late spring Fc and CWFR decreased and reached a minimum during midsummer but recovered with the approach of fall. Fc was great during late spring as a result of optimal environmental conditions and the spring growth flush. The midsummer minimum in CO2 flux appears to have been due to a reduced [CO2] gradient between the chloroplast and atmosphere, to oxygen inhibition of CO2 uptake and thermal pre-conditioning. The diurnal course of Fc 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.
Publication Year: 1981
Publication Date: 1981-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 33
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