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Stomatal behaviour, photosynthesis and transpiration under rising CO 2
Author(s) -
JARVIS A. J.,
MANSFIELD T. A.,
DAVIES W. J.
Publication year - 1999
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.1999.00407.x
Subject(s) - transpiration , photosynthesis , stomatal conductance , water content , environmental science , atmospheric sciences , botany , agronomy , biology , physics , geology , geotechnical engineering
Definitions of the variables used and the units are given in Table 1
The literature reports enormous variation between species in the extent of stomatal responses to rising CO 2 . This paper attempts to provide a framework within which some of this diversity can be explained. We describe the role of stomata in the short‐term response of leaf gas exchange to increases in ambient CO 2 concentration by developing the recently proposed stomatal model of Jarvis & Davies (1998). In this model stomatal conductance is correlated with the functioning of the photosynthetic system so that the effects of increases in CO 2 on stomata are experienced through changes in the rate of photosynthesis in a simple and mechanistically transparent way. This model also allows us to consider the effects of evaporative demand and soil moisture availability on stomatal responses to photosynthesis and therefore provides a means of considering these additional sources of variation. We emphasize that the relationship between the rate of photosynthesis and the internal CO 2 concentration and also drought will have important effects on the relative gains to be achieved under rising CO 2 . 1. Abbreviations