Quantitative assessment of stand condition and its relationship to physiological stress in stands of Eucalyptus camaldulensis (Myrtaceae)

2007 ◽  
Vol 55 (7) ◽  
pp. 692 ◽  
Author(s):  
Shaun C. Cunningham ◽  
Jennifer Read ◽  
Patrick J. Baker ◽  
Ralph Mac Nally
Keyword(s):  
Physiological Stress ◽  
Basal Area ◽  
Eucalyptus Camaldulensis ◽  
River Regulation ◽  
Area Index ◽  
Physiological Variables ◽  
Murray River ◽  
Eastern Australia ◽  
Plant Area Index ◽  
Eucalyptus Camaldulensis Dehnh

River regulation has led to a decline in the condition of Australia’s dominant riverine tree species, Eucalyptus camaldulensis Dehnh., in the Murray–Darling Basin. A quantitative method of assessing the condition of these important riparian forests is required for effective monitoring and management. A range of stand structural, morphological and physiological variables was measured in stands of contrasting condition along the Murray River in south-eastern Australia. Percentage live basal area, plant area index and crown vigour were found to be reliable, objective indicators of stand condition. Little difference was detected in the physiological performance of trees in terms of water potential and chlorophyll fluorescence among stands of good and poor condition.

scholarly journals The influence of depth-to-groundwater on structure and productivity of Eucalyptus woodlands

2014 ◽  
Vol 62 (5) ◽  
pp. 428 ◽  
Author(s):  
Sepideh Zolfaghar ◽  
Randol Villalobos-Vega ◽  
James Cleverly ◽  
Melanie Zeppel ◽  
Rizwana Rumman ◽  
...  
Keyword(s):  
Aboveground Biomass ◽  
Net Primary Productivity ◽  
Basal Area ◽  
Tree Height ◽  
Stem Density ◽  
Aboveground Net Primary Productivity ◽  
Area Index ◽  
Mean Values ◽  
Huber Value ◽  
Eastern Australia

Although it is well documented that access to groundwater can help plants survive drought in arid and semiarid areas, there have been few studies in mesic environments that have evaluated variation of vegetation characteristics across a naturally occurring gradient in depth-to-groundwater (DGW). The aim of this study was to determine whether differences in groundwater depth influence structural attributes and productivity of remnant woodlands in south-eastern Australia. The study area was located in the Kangaloon bore-field area of New South Wales, where DGW varies from 2.4 m to 37.5 m and rainfall is plentiful. We examined structural (leaf-area index, basal area, stem density, tree height, Huber value (HV) and aboveground biomass) and functional (aboveground net primary productivity (ANPP)) attributes of seven woodland sites differing in DGW. We also used ∂13C analysis of sapwood across six sites, along with observed non-linear changes in structural attributes, to infer groundwater use by trees. Significant differences in structural attributes and ANPP were observed across sites. The three shallowest sites with 2.4 m, 4.3 m and 5.5 m DWG had significantly larger aboveground biomass and ANPP than did the four deepest sites (DGW ≥9.8 m). Across all attributes (except HV in the summer, where the mean values were significantly larger at sites where DGW was 5.5 m or less and across the four deeper sites (DGW ≥9.8 m), there were no differences in these three structural traits, nor in ANPP. Despite finding no significant differences in HV across sites in the summer, in winter, the two deepest sites had a significantly larger HV than did the two shallowest sites. Significant increases in ∂13C of sapwood occurred across five of the six sites, consistent with increasing water-use efficiency as DGW increased, reflecting the declining availability of groundwater with increasing DGW. This study has demonstrated that even in a mesic environment, putative access to groundwater can have important impacts on structural and functional traits of trees and, consequently, on woodland productivity.

Temporal variability in fish assemblage structure and recruitment in a freshwater-deprived estuary: The Coorong, Australia

2010 ◽  
Vol 61 (11) ◽  
pp. 1298 ◽  
Author(s):  
Brenton P. Zampatti ◽  
Christopher M. Bice ◽  
Paul R. Jennings
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
Marine Species ◽  
River Regulation ◽  
Assemblage Structure ◽  
Estuarine Fish ◽  
Fish Assemblage Structure ◽  
Murray River ◽  
Eastern Australia ◽  
Freshwater Inflows

River regulation can diminish freshwater flows to estuaries and compromise estuarine functionality. Understanding biotic responses to altered flow regimes is imperative to effectively manage aquatic ecosystems. The present study investigated temporal variation in fish assemblage structure and the recruitment of catadromous fish in the Coorong estuary at the terminus of the Murray River, in south-eastern Australia. Over the three-year study period, freshwater inflows to the estuary diminished and ultimately ceased, disconnecting freshwater and estuarine environments. It was hypothesised that these conditions would lead to (1) increases in estuarine salinities and concomitant changes in fish assemblage structure and abundance, and (2) decreased recruitment of catadromous fish. As freshwater inflow decreased, salinities immediately downstream of a series of tidal barrages increased from brackish to marine–hypersaline, species richness and diversity decreased, freshwater and diadromous species became less abundant and assemblages were increasingly characterised by marine species. Furthermore, the abundance of young-of-year catadromous fish decreased dramatically. Excessive regulation of freshwater inflows is resulting in the Coorong estuary resembling a marine embayment, leading to a loss in species diversity. We suggest, however, that even small volumes of freshwater may promote diversity in estuarine fish assemblages and some recruitment of catadromous species.

scholarly journals Early silvicultural performance of eucalypt species grown in environmental conditions of the tropical dry forest of Colombia

2021 ◽  
Author(s):  
Camila Andrea Báez-Aparicio ◽  
Ana Milena López-Aguirre ◽  
Alonso Barrios-Trilleras
Keyword(s):  
Environmental Conditions ◽  
Tropical Dry Forest ◽  
Eucalyptus Grandis ◽  
Basal Area ◽  
Eucalyptus Camaldulensis ◽  
Dry Forest ◽  
Eucalyptus Pellita ◽  
Eucalypt Species ◽  
Eucalyptus Camaldulensis Dehnh ◽  
Selection Of

The establishment of new forest plantations requires making important decisions starting with the selection of the species to be planted, as well as the choice of an adequate planting spacing to guarantee the maximization of wood production. The aim of this study was to evaluate the performance of nine eucalypt species planted with three different spacings under the environmental conditions of the tropical dry forest of the inter-Andean valleys of Colombia. A split-plot arrangement with two replicates was used as the experimental design. The planting spacing factor (three planting spacings) was assigned to the main plots and the species factor (nine eucalypt species) was assigned to the subplots. Survival and growth were evaluated at twenty-four months of age. The study identified the Brazilian provenances of Eucalyptus camaldulensis Dehnh, Eucalyptus urophylla S.T. Blake, Eucalyptus grandis W. Hill, and Eucalyptus pellita F. Muell. and the Colombian provenance of Eucalyptus pellita F. Muell. as promising for commercial reforestation programs  in areas with a water deficit in the tropical dry forest. Planting spacings of 3×2 m (1666 stems·ha-1) and 3×2.5 m (1333 stems·ha-1) maximized the production of basal area and the volume for the species evaluated. Finally, no interaction was detected between species and planting spacing factors, therefore, the species identified had a better performance regardless of the planting spacing used. 

scholarly journals Relationships between climate of origin and photosynthetic responses to an episodic heatwave depend on growth CO2 concentration for Eucalyptus camaldulensis var. camaldulensis

2017 ◽  
Vol 44 (11) ◽  
pp. 1053 ◽  
Author(s):  
Michael E. Loik ◽  
Víctor Resco de Dios ◽  
Renee Smith ◽  
David T. Tissue
Keyword(s):  
Elevated Co2 ◽  
Eucalyptus Camaldulensis ◽  
Co2 Concentration ◽  
Co2 Assimilation ◽  
Interactive Effects ◽  
Multiple Control ◽  
Air Temperatures ◽  
Eastern Australia ◽  
Photosynthetic Responses ◽  
Eucalyptus Camaldulensis Dehnh

Stressful episodic weather is likely to affect the C balance of trees as the climate changes, potentially altering survival. However, the role of elevated CO2 concentration ([CO2]) in tolerating off-season episodic extremes is not clear. We tested for interactive effects of elevated CO2 and springtime heat stress on photosynthesis for seven genotypes of Eucalyptus camaldulensis Dehnh. var. camaldulensis, representing its widespread distribution across south-eastern Australia. We grew clonal material under glasshouse conditions of ambient (aCO2; 400 parts per million (ppm)) or elevated (eCO2; 640 ppm) [CO2], and air temperatures of 25 : 17°C (day : night), and measured the electron transport rate in PSII (ETR), stomatal conductance to water vapour (gs) and net CO2 assimilation (A). Measurements were made before, during and after a four-day temperature excursion of 35 : 27°C. ETR and A were ~17% higher for plants grown in eCO2 than in aCO2. Photosynthesis remained stable for plants in eCO2 during the heatwave. Based on the effect size ratio (eCO2 : aCO2), gs and ETR were temporarily affected more by the heatwave than A. A reduction in ETR in eCO2 was the only lasting effect of the heatwave. There were no significant differences among genotypes. Correlations between photosynthesis and climate of origin differed for plants grown in aCO2 compared with eCO2, suggesting potential complex and multiple control points on photosynthesis.

ALTURA E SOBREVIVÊNCIA DE Eucalyptus camaldulensis Dehnh EM DIFERENTES ESPAÇAMENTOS AOS 14 MESES APÓS PLANTIO EM CAMPO EM ALVORADA DO GURGUÉIA –PIAUÍ

2018 ◽  
Author(s):  
Silva Raynara Ferreira da ◽  
Sousa Moema Barbosa de ◽  
Silva Aluísio Costa ◽  
Marinho Eduardo Silva ◽  
Dias Bruna Anair Souto
Keyword(s):  
Eucalyptus Camaldulensis ◽  
Eucalyptus Camaldulensis Dehnh

scholarly journals Tratamento preservativo da madeira juvenil de Eucalyptus camaldulensis Dehnh: pelo método de substituição de seiva

CERNE ◽  
2011 ◽  
Vol 17 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Pablo Marcel de Arruda Torres ◽  
Juarez Benigno Paes ◽  
José Augusto de Lira Filho ◽  
José Wallace Barbosa do Nascimento
Keyword(s):  
Eucalyptus Camaldulensis ◽  
Rio Tinto ◽  
Eucalyptus Camaldulensis Dehnh ◽  
Río Tinto

Objetivou-se, com esta pesquisa, analisar a qualidade do tratamento preservativo da madeira juvenil de Eucalyptus camaldulensis Dehnh. e verificar a influência da inversão das peças na solução preservativa, na distribuição, na penetração e na retenção do CCB, ao longo das peças tratadas pelo método de substituição de seiva. Árvores de Eucalyptus camaldulensis foram coletadas na Zona Rural do Município de Rio Tinto - PB, de um povoamento com quatro anos. No povoamento foram escolhidas, aleatoriamente, cinco árvores, sendo três de maior diâmetro. Para o tratamento da madeira, empregou-se o método de substituição de seiva por transpiração radial utilizando-se uma solução de 2% de ingredientes ativos de borato de cobre cromatado (CCB) e comparou-se o efeito da inversão das peças na solução preservativa. A distribuição, a penetração e a retenção foram melhores nas peças invertidas, quando comparadas àquelas não-invertidas na solução preservativa.

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