Studies of Gas Exchange and Development in a Subhumid Woodland

Attiwill, P. M.; Clayton-Greene, K. A.

doi:10.2307/2260020

Cited by 31 publications

(20 citation statements)

References 9 publications

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“…Similar sinusoidal patterns have been reported for field grown trees of Eucalyptus fasciculosa (Sinclair, 1980), E. globulus (Pereira et al, 1986), E. macrocarpa (Attiwill and Clayton-Greene, 1984) and for Quercus species during periods when soil water was not severely limiting. A marked seasonal variation existed, with a greater mid-day depression during the warm and humid summer than during the cold and dry winter as well as a decreasing tendency for recovery in the afternoon (Fig.…”

Section: Discussionsupporting

confidence: 82%

“…Availability of water, nutrients and suitable temperatures are among the most important factors that limit plant productivity and yield across sites (Turner and Kramer, 1980;Kramer, 1983;Beadle and Turnbull, 1992;Landsberg, 1997). Studies of water relations of various eucalypts growing in their natural environments during times of severe drought have reported either avoidance or tolerance, or both mechanisms of adaptation, to water stress (Doley, 1967;Sinclair, 1980;Attiwill and Clayton-Greene, 1984;Davidson and Reid, 1989;Prior et al, 1997b;Prior and Eamus, 1999). Species that are profligate in their water use are reported to avoid tissue water deficit by maintaining access to a water source through deep root systems (Doley, 1967;Sinclair, 1980;White et al, 2000) enabling them to maintain high pre-dawn water potentials, relatively high stomatal conductance and presumably continued transpiration even under moderate water stress (Davidson and Reid, 1989;Abrams, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

Ngugi

Hunt

Doley

et al. 2004

Forest Ecology and Management

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

Ngugi

Hunt

Doley

et al. 2004

Forest Ecology and Management

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“…Figure 4d shows the number of cores and trees included in the chronologies. In a-c the dashed lines indicate annual values and the solid line the 11-year running mean measurements of gas exchange for other closely-related species of Callitris suggest there is little carbon fixation during seasonal dry periods (Attiwill and Clayton-Greene 1984). An October-September growth year was also used by Ash (1983) when he modeled tree ring width-climate relationships of C. macleayana from tropical Queensland.…”

Section: Climate-isotope Relationshipsmentioning

confidence: 99%

A stable oxygen, but not carbon, isotope chronology of Callitris columellaris reflects recent climate change in north-western Australia

Cullen

Grierson

2007

Climatic Change

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We investigated the dendroclimatic potential of stable carbon (δ 13 C) and oxygen (δ 18 O) abundances in tree rings of Callitris columellaris F. Muell. Tree-ring chronologies were constructed from the central Pilbara, north-western Australia and span 1919-1999. Variation in δ 18 O was more strongly related to climate than δ 13 C; ecological and physiological factors may have dampened the climate signal in the δ 13 C chronology. Tree-ring δ 18 O was most strongly correlated with relative humidity (RH) and rainfall (r=−0.36 and −0.39) of the wettest months of the summer period, January and February. The correlation with RH reflects its effect on evaporative enrichment of leaf water. However, tree-ring δ 18 O may also partly reflect the variability in 18 O signatures of rainfall, which are influenced by the amount of rainfall and atmospheric humidity. From the δ 18 O chronology, we inferred that from 1919 to 1955 summers were relatively dry and warm, but since 1955, summers in the Pilbara region have become increasingly cooler and more humid. Since 1980, conditions have been the wettest and coolest of the last 80 years. These inferred changes in climate correspond to a measured increase in rainfall since 1980 in north-western Australia associated with a greater intensity of tropical cyclones. We conclude that δ 18 O abundances in tree rings of C. columellaris have significant potential for reconstructing the climate of semi-arid Australia, a region for which observational climate records are sparse.

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“…Nevertheless, greater mortality was expected over the following 6 years, especially given that Callitris seedlings were so much smaller than associated Eucalyptus seedlings. Post-fire rainfall at the nearby Beechworth weather station was slightly higher than the long-term average for the first 3 years after burning Callitris species are extremely drought tolerant (Attiwill and Clayton-Greene 1984;Zeppel and Eamus 2008;Brodribb et al 2010), and saplings self-thin extremely slowly, forming dense 'locked stands' containing suppressed, slow-growing trees (Lacey 1973;Thompson and Eldridge 2005;Ross et al 2008). Lacey (1973) reported that 'in excess of .…”

Section: Seedling Mortalitymentioning

confidence: 99%

The tortoise and the hare? Post-fire regeneration in mixed Eucalyptus - Callitris forest

2011

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Abstract. Seedling regeneration after a high intensity wildfire was assessed in a mixed forest dominated by Eucalyptus species and Callitris endlicheri (Parl.) F.M. Bailey. Patterns were compared against the 'slow seedling' or 'tortoise-and-hare' theory of competitive interactions between gymnosperms and angiosperms. Browsing effects were documented using fenced plots, and seedling density, mortality and height were assessed over 6 years, from 2004-10. Consistent with expectations, Eucalyptus seedlings grew faster than Callitris seedlings in most situations. Callitris seedlings grew faster and produced seed cones sooner in plots with fewer Eucalyptus seedlings compared with plots with dense Eucalyptus seedlings. The local growth rates of Callitris seedlings were not associated with long-term site suitability for Callitris, as many plots with diminutive Callitris seedlings and dense Eucalyptus seedlings were dominated by Callitris trees before the 2003 fire. Contrary to expectations, few Callitris seedlings died during the 6-year period, so competition during the regeneration phase did not regulate co-existence. Strong drought tolerance and the ability to persist in dense, unthinned stands may enable Callitris to persist beneath dense Eucalyptus regeneration. Nevertheless, Callitris seedlings growing with dense Eucalyptus seedlings have a longer primary juvenile period than seedlings in sites with fewer seedling or adult eucalypts, which places these stands at greater risk of mortality in future fires and greater risk of browsing in the meantime.

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Studies of Gas Exchange and Development in a Subhumid Woodland

Cited by 31 publications

References 9 publications

Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

A stable oxygen, but not carbon, isotope chronology of Callitris columellaris reflects recent climate change in north-western Australia

The tortoise and the hare? Post-fire regeneration in mixed Eucalyptus - Callitris forest

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