Estimation of above-ground biomass of trees and shrubs in a Eucalyptus populnea F. Muell. woodland by regression of mass on trunk diameter and plant height

Harrington, G. N.

doi:10.1071/bt9790135

Cited by 66 publications

(44 citation statements)

References 8 publications

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“…5). For D. viscosa the C gain during the period may have been somewhat higher, but because this species has a much lower leaf weight for comparable sized bushes than E. mitchellii (Harrington 1979), the overall C gain per bush would have been less.…”

Section: Spatial and Temporal Variation In Shrub Water Relationsmentioning

confidence: 98%

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Water relations and growth of shrubs before and after fire in a semi-arid woodland

Hodgkinson

1992

Oecologia

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Plant water relations and shoot growth rate of shrubs resprouting after fire or unburnt were measured in a semi-arid poplar box (Eucalyptus populnea) shrub woodland of eastern Australia. In vegetation unburnt for about 60 years, the dawn xylem water potential (ψ) of the dominant shrub species was about-1.0 MPa when the soil was wet and-8.0 MPa when the soil was very dry. At any one time, the dominant shrub species,Eremophila mitchellii, E. sturtii, Geijera parviflora andCassia nemophila, were similar in ψ butAcacia aneura andDodonaea viscosa were consistently higher in ψ than this group when the soil was moist and lower when the soil was dry. The dominant tree species,Eucalyptus populnea andE. intertexta, appeared to have access to additional water beneath the hardpan which is located 60-80 cm below the surface. When shrubs were under extreme water stress (ψ of-8 MPa), the trees had a ψ of-3 to-3.6 MPa. Following a fire, both ψ and leaf stomatal conductance (g ) of resprouting shrubs were higher for about 5 years than comparable-aged unburnt vegetation, with relative differences in ψ increasing with drought stress. Elongation rate of resprouts was positively linked to prefire shrub height in 3 of 4 species. However, shrubs resprouting after high intensity fires had substantially higher rates of shoot elongation than after low intensity fires which were in turn higher than for foliar expansion of unburnt shrubs. It is concluded that the growth rate of resprouting shrubs is primarily determined by physiological/ morphological factors associated with plant size but is also assisted by greater availability of water and possibly nutrients for a period after fire.

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Section: Spatial and Temporal Variation In Shrub Water Relationsmentioning

confidence: 98%

“…Vegetation at the site is described by Harrington (1979 both "thickets" and "interthickets" (Harrington et al 1981). Shrub density is about 4800 ha -1.…”

Section: Study Sitementioning

confidence: 99%

Water relations and growth of shrubs before and after fire in a semi-arid woodland

Hodgkinson

1992

Oecologia

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“…Measured values for the ratio leafs to total above-ground biomass ranged between 3% and 34%, with a median at 18% as reported in Ref. [51]. Navarro-Cerrillo [50] gives an overview of photosynthetic-to-total phytomass values for many species; most of the data fell in the range 12% and 19%.…”

Section: Low Growing Vegetation and Shrubsmentioning

confidence: 99%

Road traffic noise shielding by vegetation belts of limited depth

Renterghem

Botteldooren

Verheyen

2012

Journal of Sound and Vibration

163

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Road traffic noise propagation through a vegetation belt of limited depth (15 m) containing periodicallyarranged trees along a road is numerically assessed by means of 3D finite-difference time-domain (FDTD) calculations. The computational cost is reduced by only modeling a representative strip of the planting scheme and assuming periodic extension by applying mirror planes. With increasing tree stem diameter and decreasing spacing, traffic noise insertion loss is predicted to be more pronounced for each planting scheme considered (simple cubic, rectangular, triangular and face-centered cubic). For rectangular schemes, the spacing parallel to the road axis is predicted to be the determining parameter for the acoustic performance. Significant noise reduction is predicted to occur for a tree spacing of less than 3 m and a tree stem diameter of more than 0.11 m. This positive effect comes on top of the increase in ground effect (near 3 dBA for a light vehicle at 70 km/h) when compared to sound propagation over grassland. The noise reducing effect of the forest floor and the optimized tree belt arrangement are found to be of similar importance in the calculations performed. The effect of shrubs with typical above-ground biomass is estimated to be at maximum 2 dBA in the uniform scattering approach applied for a light vehicle at 70 km/h. Downward scattering from tree crowns is predicted to be smaller than 1 dBA for a light vehicle at 70 km/h, for various distributions of scattering elements representing the tree crown. The effect of the presence of tree stems, shrubs and tree crowns is predicted to be approximately additive.Inducing some (pseudo)randomness in stem centre location, tree diameter, and omitting a limited number of rows with trees seem to hardly affect the insertion loss. These predictions suggest that practically achievable vegetation belts can compete to the noise reducing performance of a classical thin noise barrier (on grassland) with a height of 1 to 1.5 m (in a non-refracting atmosphere).

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“…Individual shrub heights were recorded when plants were initially tagged so that leaf, stem and total biomass, all calculated using allometric relationships developed by Harrington (1979), could be used as covariate data if necessary. Five assessments of leaf effect were made in August 1994, October 1994, February 1995, June 1995 and October 1995.…”

Section: Restoration Technologymentioning

confidence: 99%

Integrated shrub management in semi-arid woodlands of eastern Australia: ground and aerial application of defoliant to shrubs regenerating after disturbance

et al. 2005

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Abstract. This paper describes experiments undertaken at several sites in semi-arid woodlands of eastern Australia to determine if chemicals applied either on the ground or from the air reduce the density of shrubs regenerating after disturbance. Ground-spraying of Roundup r in the autumn was more effective than spring application in defoliating shrubs, especially 2-year-old coppice growth. Spraying of Roundup with a hand-held boom at 0.5 up to 2.5 kg glyphosate/ha identified rates to be used for boom spraying. Aerial spraying experiments were then undertaken across several sites and involved several target species. The location of sufficiently large areas where shrub regeneration was of an optimum age (i.e. about 2-3 years) proved to be extremely difficult due to prevailing drought conditions precluding the use of prescribed fire as a preliminary treatment. Nonetheless in one experiment, young (1-year-old) regrowth of firebush (Senna pleurocarpa) exhibited increased sensitivity to Roundup with significant shoot mortality recorded after it had been applied at 0.5 kg glyphosate/ha. Aerial spraying based on an ultra-low volume application of 10 L/ha further enhanced cost-effectiveness on this occasion. Economic analyses structured around 20-year partial budgeting and determination of net present value (NPV) suggested a profitable return could be expected where treatment was based on Roundup applied at this threshold rate 2 years after a prescribed fire, especially when the rehabilitation costs were spread over an entire paddock that had been only partially sprayed. Finally, operational aspects involving aerial spraying in these semi-arid woodlands are also discussed.

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Estimation of above-ground biomass of trees and shrubs in a Eucalyptus populnea F. Muell. woodland by regression of mass on trunk diameter and plant height

Cited by 66 publications

References 8 publications

Water relations and growth of shrubs before and after fire in a semi-arid woodland

Water relations and growth of shrubs before and after fire in a semi-arid woodland

Road traffic noise shielding by vegetation belts of limited depth

Integrated shrub management in semi-arid woodlands of eastern Australia: ground and aerial application of defoliant to shrubs regenerating after disturbance

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