Sensitivity of evapotranspiration and soil moisture in wheat fields to changes in climate and direct effects of carbon dioxide
作者:
L.S. KUCHMENT,
Z.P. STARTSEVA,
期刊:
Hydrological Sciences Journal
(Taylor Available online 1991)
卷期:
Volume 36,
issue 6
页码: 631-643
ISSN:0262-6667
年代: 1991
DOI:10.1080/02626669109492548
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A physically based model of moisture transfer in the soil-canopy-atmosphere system, fitted to measured data in wheat fields, was applied to calculate the sensitivity of evapotranspiration to the combined effect of possible CO2-induced climate changes and the direct impact of doubling CO2content in the atmosphere. The impact of carbon dioxide was taken into account by changing the stomatal resistance and the leaf area index. Several climate change scenarios were used. Simulation studies showed that when the changes of a number of climatic and plant factors are considered, evapotranspiration responses can differ greatly from those that consider only temperature change. The temperature effect of the increase in CO2content in the atmosphere can be compensated by changes in the physiological parameters of vegetation. Thus, under certain conditions, one can expect a decrease in evapotranspiration instead of an increase such as is predicted by a number of models which neglect the direct effects of CO2on plant behaviour.
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