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The photosynthetic drought physiology of a diverse group of southern hemisphere conifer species is correlated with minimum seasonal rainfall

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posted on 2023-05-16, 11:24 authored by Timothy BrodribbTimothy Brodribb, Robert HillRobert Hill
1. The instantaneous and integrated leaf gas exchange of 13 species of southern hemisphere conifers grown under identical glasshouse conditions were examined to determine whether there was any correlation between the characteristics of water use at the leaf level and environmental water availability. 2. In the conifer species examined, the minimum ratio of internal to ambient CO2 measured in leaves during artificially imposed drought [(C(i)/C(a))(min)] was strongly correlated with the minimum rainfall observed within the natural range of each species. This suggests that the distributions of these species are constrained by the drought tolerance of their photosynthetic apparatus. 3. A good correlation was found between the ratio of internal to ambient CO2 measured in leaves under optimal conditions (C(i)/C(a))(max) and leaf δ13C (and hence inferred ∫ [C(i)/C(a)]). Neither of these, however, correlated with the environmental parameters considered most likely to be limiting species distribution, i.e. precipitation and altitude. 4. These data suggest that decreasing water availability may have been the major factor responsible for the restriction and extinction of conifers in the southern hemisphere.

History

Publication title

Functional Ecology

Volume

12

Pagination

465-471

ISSN

0269-8463

Department/School

School of Natural Sciences

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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