An analysis of sap flow in mountain ash (Eucalyptus regnans) forests of different age

1993 ◽  
Vol 13 (4) ◽  
pp. 321-336 ◽  
Author(s):  
G. M. Dunn ◽  
D. J. Connor
Keyword(s):  
Sap Flow ◽  
Eucalyptus Regnans ◽  
Mountain Ash

Does nitrogen limit the growth of native eucalypt forests:some observations for mountain ash (Eucalyptus regnans)

2001 ◽  
Vol 52 (1) ◽  
pp. 111 ◽  
Author(s):  
P. M. Attiwill ◽  
P. M. Attiwill ◽  
B. M. May ◽  
B. M. May
Keyword(s):  
N Availability ◽  
Ecological Research ◽  
Biological Fixation ◽  
Ecological Processes ◽  
Eucalyptus Regnans ◽  
Rate Of Growth ◽  
Wild Fire ◽  
N Supply ◽  
Eastern Australia ◽  
Mountain Ash

It is often stated that the availability of N limits the rate of growth of native forests. We discuss this hypothesis with particular reference to the mountain ash (Eucalyptus regnans) forests of south-eastern Australia. The abundance of 15 N in leaves and soil of mountain ash forest is in accord with data for Northern Hemisphere temperate forests and for tropical forests,and indicates that N availability is relatively high.None of the nutrient elements has limited the rate of growth of mountain ash forest regenerating after major disturbance (clear-felling and intense wild-fire). There is some evidence that P may be limiting to some ecological processes (e.g. the rate of litter decomposition). We conclude that phosphorus is more likely to be limiting than nitrogen in mountain ash forest because nitrogen cycling is conservative and continual inputs of N through biological fixation supplement this conservative N supply, and the stands never become N-deficient. The development of methodologies to determine the rate of N2-fixation in forests should be of high priority in ecological research.

Economics of a nest-box program for the conservation of an endangered species: a reappraisal

2001 ◽  
Vol 31 (11) ◽  
pp. 1992-2003 ◽  
Author(s):  
Daniel A Spring ◽  
Michael Bevers ◽  
John OS Kennedy ◽  
Dan Harley
Keyword(s):  
Net Present Value ◽  
Population Recovery ◽  
Optimal Management ◽  
Present Value ◽  
Eucalyptus Regnans ◽  
Nest Boxes ◽  
Mountain Ash ◽  
Local Abundance ◽  
Leadbeater's Possum

An optimization model is developed to identify timing and placement strategies for the installation of nest boxes and the harvesting of timber to meet joint timber–wildlife objectives. Optimal management regimes are determined on the basis of their impacts on the local abundance of a threatened species and net present value (NPV) and are identified for a range of NPV levels to identify production possibility frontiers for abundance and NPV. We apply the model to a case study focusing on an area of commercially productive mountain ash (Eucalyptus regnans F. Muell.) forest in the Central Highlands region of Victoria, Australia. The species to be conserved is Leadbeater's possum (Gymnobelideus leadbeateri McCoy), which is locally limited by a scarcity of nesting hollows. The modeling is exploratory but indicates that nest boxes may offer a promising population recovery tool if consideration is taken of their placement and areal extent through time.

Anatomical Aspects of Water Movement Through Stems of Mountain Ash (Eucalyptus regnans F. Muell.)

1985 ◽  
Vol 33 (3) ◽  
pp. 287 ◽  
Author(s):  
NJ Legge
Keyword(s):  
Surface Area ◽  
Microscopic Examination ◽  
Water Movement ◽  
Lateral Roots ◽  
Age Classes ◽  
Young Tree ◽  
Eucalyptus Regnans ◽  
Mountain Ash ◽  
Limited Degree ◽  
Old Trees

Introduction of a stain through the severed roots of Eucalyptus regnans of two age classes showed that a spiral interlocked sap ascent pattern in young trees tended towards a vertical sectorial pattern by age 40 years. Microscopic examination of the stained wood suggests that intercellular water movement occurs principally via the pits. Serial transverse sections of wood from a young tree showed a limited degree of intervessel contact, with a network coefficient of 13.7 contacts m-1 and approx. 0.9% of vessel surface area in contact with other vessels. Analysis of the frequency of vessel endings indicates an average vessel length of approx. 1.8 m. Trunk segments of 40-year-old trees had relative conductivities of approx. 3.3 x 10-11 m2, while small lateral roots had values up to 10 times greater.

Micropropagation of Juvenile Eucalyptus regnans (Mountain Ash)

1991 ◽  
Vol 39 (2) ◽  
pp. 179 ◽  
Author(s):  
C Blomstedt ◽  
J Cameron ◽  
P Whiteman ◽  
SF Chandler
Keyword(s):  
Woody Plant ◽  
Basal Medium ◽  
High Light Intensity ◽  
Shoot Cultures ◽  
Light Conditions ◽  
Indolebutyric Acid ◽  
Eucalyptus Regnans ◽  
Mountain Ash ◽  
Napthaleneacetic Acid

Node-derived shoot cultures of Eucalyptus regnans were established from in vitro grown seedlings on Murashige and Skoog basal medium supplemented with 0.5 mg L-1 (2 μm) zeatin and 0.05 mg L-1 (0.3 μm) napthaleneacetic acid. A double sterilisation method was essential to obtain clean material from seed. Microcuttings from established cultures were used to develop an efficient method for in vitro rooting. Rooting was best after a 7 day pulse on 20 mg L-1 (98 μm) indolebutyric acid. Hoagland's or Woody Plant Medium supported better rooting than MS basal medium and rooting was significantly enhanced by subculture to activated charcoal after the auxin pulse. Carbohydrate (sucrose or glucose) was essential for rooting while high light intensity was inhibitory. Optimal light conditions were a 12 h day (17 W m-2). In all, 90% of plantlets established in the nursery survived the winter.

scholarly journals Estimating stand water use of large mountain ash trees and validation of the sap flow measurement technique

1997 ◽  
Vol 17 (12) ◽  
pp. 747-756 ◽  
Author(s):  
R. A. Vertessy ◽  
T. J. Hatton ◽  
P. Reece ◽  
S. K. O'Sullivan ◽  
R. G. Benyon
Keyword(s):  
Water Use ◽  
Measurement Technique ◽  
Sap Flow ◽  
Flow Measurement ◽  
Mountain Ash ◽  
Ash Trees
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