Ghannoum2010b

Report for study: Ghannoum2010b

Contact Information

Data contributor: David Tissue

Email: [email protected]

Address:

• Hawkesbury Insitute for the Environment, University of Western Sydney, Hawkesbury Campus, First Floor, Building L9, Locked Bag 1797, Penrith NSW 2751, Australia

Data source

Citation: Ghannoum O, Phillips NG, Sears MA, Logan BA, Lewis JD, Conroy JP and Tissue DT (2010). 'Photosynthetic responses of two eucalypts to industrial-age changes in atmospheric [CO2] and temperature.' Plant, Cell & Environment, 33(10), pp. 1671-1681.

DOI: 10.1111/j.1365-3040.2010.02172.x

Abstract: The unabated rise in atmospheric [CO2] is associated with increased air temperature. Yet, few CO2-enrichment studies have considered pre-industrial [CO2] or warming. Consequently, we quantified the interactive effects of growth [CO2] and temperature on photosynthesis of faster-growing Eucalyptus saligna and slower-growing E. sideroxylon. Well-watered and -fertilized tree seedlings were grown in a glasshouse at three atmospheric [CO2] (290, 400, and 650 yL/L), and ambient (26/18 degC, day/night) and high (ambient + 4 degC) air temperature. Despite differences in growth rate, both eucalypts responded similarly to [CO2] and temperature treatments with few interactive effects. Light-saturated photosynthesis (Asat) and light- and [CO2]-saturated photosynthesis (Amax) increased by ~50% and ~10%, respectively, with each step-increase in growth [CO2], underpinned by a corresponding 6-11% up-regulation of maximal electron transport rate (Jmax). Maximal carboxylation rate (Vcmax) was not affected by growth [CO2]. Thermal photosynthetic acclimation occurred such that Asat and Amax were similar in ambient- and high-temperature-grown plants. At high temperature, the thermal optimum of Asat increased by 2-7 degC across [CO2] treatments. These results are the first to suggest that photosynthesis of well-watered and -fertilized eucalypt seedlings will remain strongly responsive to increasing atmospheric [CO2] in a future, warmer climate.

Overview of data provided

The dataset includes records for 108 individuals from 1 species belonging to 1 family(ies), presenting 1 functional type(s), growing in 1 condition(s) within 1 major type(s) of habitat, with data included for the following variables:

Variable	Label	Units	N	Min	Median	Max
latitude	Latitude	deg	108	-34	-34	-34
longitude	Longitude	deg	108	151	151	151
a.lf	Leaf area	m2	108	0.0015	0.038	0.25
a.stba	Stem area at base	m2	108	0.00000047	0.0000079	0.000066
h.t	Height	m	108	0.037	0.36	0.65
d.ba	Basal diameter	m	108	0.00077	0.0032	0.0092
m.lf	Leaf mass	kg	108	0.00006	0.0015	0.012
m.st	Total stem mass	kg	108	0.00003	0.00071	0.0059
m.so	Aboveground mass	kg	108	0.00011	0.0023	0.018
m.rt	Total root mass	kg	108	0.00014	0.0017	0.019
m.to	Total mass	kg	108	0.00044	0.0043	0.037
ma.ilf	Leaf mass per area	kg m-2	108	0.0073	0.04	0.073

And locally within the country:

The sites sampled are:

Location	Longitude	Latitude	Vegetation
University of Western Sydney, Richmond, NSW, Australia	150.75	-33.61

The growing conditions of sampled plants was:

Location	Grouping	growingCondition
University of Western Sydney, Richmond, NSW, Australia	CO2 = 400; Temp = Amb	glasshouse
University of Western Sydney, Richmond, NSW, Australia	CO2 = 280; Temp = Amb	glasshouse
University of Western Sydney, Richmond, NSW, Australia	CO2 = 640; Temp = Amb	glasshouse
University of Western Sydney, Richmond, NSW, Australia	CO2 = 400; Temp = Elv	glasshouse
University of Western Sydney, Richmond, NSW, Australia	CO2 = 280; Temp = Elv	glasshouse
University of Western Sydney, Richmond, NSW, Australia	CO2 = 640; Temp = Elv	glasshouse

Species sampled

Species	Family	Pft
Eucalyptus saligna	Myrtaceae	evergreen angiosperm

Methods used

Sampling strategy: Two eucalyptus species (Eucalyptus saligna and Eucalyptus sideroxylon) were grown at full field capacity under a treatment combination of ambient or elevated temperature (26/18 C or 30/22 C) and subambient, ambient or elevated CO2 (280, 400 or 640 ppm). Seedlings were grown for 80 days from planting, at which time they were subjected to a destructive harvest of all biomass.

Leaf area: All leaves were measured in a leaf area meter (LI-COR 3100, LI-COR, Inc., Lincoln, Nebr.).

Height: Height was measured as the vertical distance from the pot surface to the highest apex.

Biomass: All stems, leaves and roots were destructively harvested 80 days after planting, and dried at 80degC for 48 h.

Growth environment: Glasshouse.

Year collected: 2008-2009

Plots of data

This is how the study Ghannoum2010b fits in the entire dataset (grey). each colour represents a species. A legend of species names with colours is included at the end for reports with 1 < n < 20 species.