Canopy Dynamics of Eucalyptus maculata Hook. III Effects of Drought

Pook, E. W.

doi:10.1071/bt9850065

Cited by 83 publications

(50 citation statements)

References 13 publications

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“…In addition to alterations in leaf pigments, premature abscission of foliage, production of fewer and smaller leaves and contracted crowns can arise in eucalypts from abiotic (Pook 1985, Stone and Bacon 1994, Snowdon 2000, Thomson et al 2001 or biotic damage (Shearer and Smith 2000, Stone et al 2000. These types of symptoms, which influence crown size and density, have a direct impact on biomass production of young eucalypt plantations (Jordan et al 2002.…”

Section: Detection Of Stress In Eucalyptsmentioning

confidence: 99%

Crown‐scale evaluation of spectral indices for defoliated and discoloured eucalypts

Barry

Stone²,

Mohammed

2008

International Journal of Remote Sensing

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Remote sensing for evaluation of canopy health in plantation eucalypts is a realistic option for forest managers in the near future if reliable and robust methods of spectral analysis can be developed. Pot-grown eucalypts of three species important to the Australian plantation industry were used for crown-scale spectral (400-1000 nm) evaluations of vegetation indices as indicators of common symptoms of stress. When defoliation treatments (in E. globulus) or exposure to cold and nutrient deprivation (in E. pilularis) resulted in large differences in leaf cover, the red edge position and slope indices, two normalized difference vegetation indices (NDVIs), modified chlorophyll absorption ratio index 2 (MCARI2) or modified triangular vegetation index 2 (MTVI2) were most strongly correlated to leaf cover. However the NDVIs were significantly affected by soil background in a study with E. globulus. The percentage of red leaves resulting from stress treatment was most strongly correlated with the anthocyanin reflectance index (ARI) and red-green index (RGI) in both E. grandis and E. pilularis, however the RGI was affected by background type in the E. globulus study while the ARI was not. Exposure to cold and nutrient deprivation led to marked changes in leaf cover for E. pilularis but not in E. grandis and a much more reduced level of chlorophyll in E. pilularis than is suspected in E. grandis. In E. globulus, defoliation from the upper crown was easier to detect with spectral data than from the lower crown. Results were generally comparable to studies of eucalypt crown condition from native forests.

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Section: Detection Of Stress In Eucalyptsmentioning

confidence: 99%

Crown‐scale evaluation of spectral indices for defoliated and discoloured eucalypts

Barry

Stone²,

Mohammed

2008

International Journal of Remote Sensing

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“…This has been observed in several Eucalyptus species where individual trees lost between 50-97 per cent of their leaves in response to a severe drought (Pook 1985). A seasonal variation has also been observed in evergreen Nothofagus sp.…”

Section: Canopy Interceptionmentioning

confidence: 71%

“…) compared with other temperate trees, and this increases with stand age (Ashton 1975, Pook 1985, Martin et al 2007). …”

Section: Soil Water Holding Capacitymentioning

confidence: 99%

The nature of the recent rainfall decrease in the vicinity of Melbourne, southeastern Australia, and its impact on soil water balance and groundwater recharge

Larsen¹,

Nicholls²

2012

AMOJ

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“…C. citriodora produces large numbers of leaves with high photosynthetic rates and relatively short leaf lifespans of less than one-year (Poorter and Bongers, 2006;Laclau et al, 2009). A common response to drought marked by the onset of the dry season in Eucalypts is to rapidly lose older leaves, thus reducing photosynthetic area from which transpirative water-loss can occur (Pook, 1985;Prior et al, 1997). The leaves of Z. nummularia are generally more robust with a longer leaf lifespan reflecting a greater investment in structural material such as lignin (Niinemets, 1999;Haworth and Raschi, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The native habitat of C. citriodora is sub-tropical and tropical summer dry forests of north-eastern Australia that receive 500-800 mm of precipitation annually, with most falling during the winter. During the dry period C. citriodora frequently loses a high proportion of older leaves and branches to reduce water loss (Pook, 1985;Prior et al, 1997). Relatively few episodes of drought occur during the winter-wet period in the native habitat of C. citriodora.…”

Section: Discussionmentioning

confidence: 99%

Divergent Gas-exchange, Physiological, Isotopic and Compositional Responses of Two Wood-crop Species to Water Deficit: Ziziphus nummularia and Corymbia citriodora

Mahmood¹,

Saeed²,

Saleem³

et al. 2015

IJAB

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To cite this paper: Mahmood, T., A. Saeed, A.R. Saleem, M. Haworth and M. Centritto, 2015. Divergent gas-exchange, physiological, isotopic and compositional responses of two wood-crop species to water deficit: AbstractWe assessed the response to drought in Corymbia citriodora, a fast growing wood-crop with high levels of water-loss, and Ziziphus nummularia, a tree species that occurs in arid areas of Asia and a potential alternative wood-crop plantation species in drought-prone regions. Z. nummularia was able to sustain higher levels of stomatal conductance at lower levels of soil water availability than C. citriodora. The leaves of Z. nummularia also contained higher levels of the antioxidant peroxidase, offering enhanced protection from drought induced oxidative stress. The carbon isotopic and nitrogen concentration of C. citriodora foliage was strongly affected by decreasing soil water availability, but a compositional effect was only apparent in Z. nummularia leaves at the lowest level of soil water. The higher leaf levels of stomatal conductance and nitrogen are indicative of relatively high assimilation rates in Z. nummularia, suggesting that this species is capable of fully exploiting brief periods where conditions are limited for growth. These attributes, in combination with its inherent tolerance to drought, may make Z. nummularia a suitable wood crop species for rain-fed plantations in drought-prone areas.

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Canopy Dynamics of Eucalyptus maculata Hook. III Effects of Drought

Cited by 83 publications

References 13 publications

Crown‐scale evaluation of spectral indices for defoliated and discoloured eucalypts

Crown‐scale evaluation of spectral indices for defoliated and discoloured eucalypts

The nature of the recent rainfall decrease in the vicinity of Melbourne, southeastern Australia, and its impact on soil water balance and groundwater recharge

Divergent Gas-exchange, Physiological, Isotopic and Compositional Responses of Two Wood-crop Species to Water Deficit: Ziziphus nummularia and Corymbia citriodora

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