Patterns of leaf gas exchange along a continentalscale rainfall gradient in north Australia. Lucas Cernusak Charles Darwin University
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1 Patterns of leaf gas exchange along a continentalscale rainfall gradient in north Australia Lucas Cernusak Charles Darwin University
2 Sampling sites
3 Leaf gas exchange measurements
4 Leaf gas exchange measurements- Boulia
5 Leaf gas exchange summary by site Photosynthesis (µmol CO 2 m -2 s -1 )3 A B C D E F Sampling site Initial conductance (mol m -2 s -1 ) A B C D E F Sampling site Sampling sites A- Howard Springs B- Adelaide River C- Daly River D- Dry Creek E- Sturt Plains F- Boulia.7 Initial c i /c a.6.5 Time of sampling A B C D E F Sampling site 5 A B C D E F Sampling site
6 c i /c a relatively constant among sites.8.7 Initial c i /c a A B C D E F Sampling site 3 Photosynthesis Species C. latifolia E. aparrerinja E. coolibah E. miniata E. pruinosa E. tectifica E. terminalis E. tetrodonta Stomatal conductance
7 Water-use efficiency partly controlled by c i /c a A E = c a ci 1 c a 1.6v Farquhar, O Leary, and Berry (1982) Australian Journal of Plant Physiology 9:
8 Excel utility for fitting A-C i curves (Sharkey et al. 27)
9 No apparent bias depending on which IRGA was used Vcmax at leaf temperature (µmol m-2 s-1) Monash UWS IRGA
10 Eucalyptus tetrodonta temperature response (Daly River) Vcmax at leaf temperature (µmol m-2 s-1) Leaf temperature ( C)
11 Eucalyptus tetrodonta temperature response (Daly River) 3 Vcmax at leaf temperature Vcmax normalized to 25 C Vcmax (µmol m-2 s-1) Measurement temperature ( C)
12 Variation among sites in Vcmax A B C D E F Sampling site A B C D E F Sampling site Vcmax at leaf temperature (µmol m -2 s -1 ) Vcmax normalized to 25 C (µmol m -2 s -1 )
13 E. tetrodont Variation among species in Vcmax C. latifolia E. aparrerin E. coolibah E. miniata E. pruinosa E. tectifica E. terminali E. tetrodont C. latifolia E. aparrerin E. coolibah E. miniata E. pruinosa E. tectifica E. terminali Species Species Vcmax at leaf temperature (µmol m -2 s -1 ) Vcmax normalized to 25 C (µmol m -2 s -1 )
14 Vcmax showed a strong dependence on initial stomatal conductance Vcmax normalized to 25 C (µmol m -2 s -1 ) Initial stomatal conductance (mol m -2 s -1 ) Sampling site Howard Springs Adelaide River Daly River Dry Creek Sturt Plains Boulia
15 Initial stomatal conductance was the strongest term in ANOVA for Vcmax, but site and species were also significant Categorical values encountered during processing are: SITE$ (6 levels) Adelaide Riv, Boulia, Daly River, Dry Creek, Howard Sprin, Sturt Plains SPECIES$ (8 levels) C. latifolia, E. aparrerin, E. coolibah, E. miniata, E. pruinosa, E. tectifica, E. terminali, E. tetrodont Dep Var: VCM_25 N: 75 Multiple R:.8882 Squared multiple R: Analysis of Variance Source Sum-of-Squares df Mean-Square F-ratio P SITE$ CONDUCTANCE SITE$*CONDUCTANCE SPECIES$(SITE$) Error
16 Excel utility for fitting A-C i curves (Sharkey et al. 27)
17 Conclusions and future directions Photosynthesis, conductance and c i /c a did not show large variation among sites along the rainfall gradient These gas exchange data are consistent with previous measurements of 13 C discrimination (Miller et al. 21) Vcmax, estimated assuming constant mesophyll conductance of 3 mol m -2 s -1 bar -1, showed strong dependence initial stomatal conductance Mesophyll conductance and stomatal conductance likely covary Leaf samples currently being processed for nitrogen concentration and δ 13 C
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