Behaviour of annual species of Medicago introduced into a Medicago minima (L). Bart.–dominant disclimax community

1962 ◽  
Vol 13 (2) ◽  
pp. 212 ◽  
Author(s):  
WD Andrew
Keyword(s):  
Dominant Species ◽  
New South ◽  
New South Wales ◽  
Annual Species ◽  
South Wales

Of the 11 medics introduced into a disclimax community in which M. minima (L.) Bart. was the dominant species in the herbaceous stratum, the only ones which successfully competed with the naturalized medic were: M. confinis Koch, M. scutellata (L.) Mill., M. tribuloides Desr., and M. turbinata (L.) Willd. The last two species are considered the most suitable for widespread testing on well-drained black soils in northern New South Wales.

Corrigendum - Frequency of annual species of Medicago on the major soil groups of the Mcquarie region of New South Wales

1960 ◽  
Vol 11 (5) ◽  
pp. 705
Author(s):  
WD Andrew ◽  
FW Hely
Keyword(s):  
New South ◽  
New South Wales ◽  
Salt Content ◽  
Acid Group ◽  
Soluble Salt ◽  
Annual Species ◽  
South Wales ◽  
Soil Groups ◽  
Soil Habitat ◽  
Poor Drainage

The frequency of eight annual species of Medicago was determined on 10 soil groups in a region climatically favourable for medics. They occurred on nine of these, the overall frequency being in the order M. minima (L.) Bart. > M. denticulata Willd. > M. laciniata (L.) Mill., M. praecox DC., M. tribuloides Desr., and M. orbicularis (L.) Bart. > M. arabica (L.) Huds. and M. confinis Koch. M. minima was more tolerant of variation of soil habitat than any other medic in the region. M. denticulata was most commonly found on the soils of high soluble salt content and showed the greatest tolerance of poor drainage conditions. M. laciniata occurred in greatest abundance on soils of the well-drained brown acid group. M. praecox was most commonly found on soils with a compact gravelly surface. M. tribuloides was recorded on five soil groups but was common only on the black earths. M. orbicularis was confined to the black earth and red loam soils. M. arabica was rarely found, being restricted to lower, fertile, well-drained parts of the landscape, and M. confinis occurred only occasionally and then in association with M. denticulata.

Frequency of annual species of Medicago on the major soil groups of the Mcquarie region of New South Wales

1960 ◽  
Vol 11 (5) ◽  
pp. 705
Author(s):  
WD Andrew ◽  
FW Hely
Keyword(s):  
New South ◽  
New South Wales ◽  
Salt Content ◽  
Acid Group ◽  
Soluble Salt ◽  
Annual Species ◽  
South Wales ◽  
Soil Groups ◽  
Soil Habitat ◽  
Poor Drainage

The frequency of eight annual species of Medicago was determined on 10 soil groups in a region climatically favourable for medics. They occurred on nine of these, the overall frequency being in the order M. minima (L.) Bart. > M. denticulata Willd. > M. laciniata (L.) Mill., M. praecox DC., M. tribuloides Desr., and M. orbicularis (L.) Bart. > M. arabica (L.) Huds. and M. confinis Koch. M. minima was more tolerant of variation of soil habitat than any other medic in the region. M. denticulata was most commonly found on the soils of high soluble salt content and showed the greatest tolerance of poor drainage conditions. M. laciniata occurred in greatest abundance on soils of the well-drained brown acid group. M. praecox was most commonly found on soils with a compact gravelly surface. M. tribuloides was recorded on five soil groups but was common only on the black earths. M. orbicularis was confined to the black earth and red loam soils. M. arabica was rarely found, being restricted to lower, fertile, well-drained parts of the landscape, and M. confinis occurred only occasionally and then in association with M. denticulata.

Frequencies of annual species of Medicago on subgroups of the grey and brown soils of heavy texture of the Macquarie Region of New South Wales

1962 ◽  
Vol 13 (5) ◽  
pp. 801 ◽  
Author(s):  
FW Hely
Keyword(s):  
New South ◽  
New South Wales ◽  
Low Frequency ◽  
The Other ◽  
Annual Species ◽  
South Wales

Four broad subgroups were recognized in the grey and brown soils of heavy texture in the Macquarie region of central New South Wales, and five annual species of Medicago (medics) were found occurring naturally on these soils, but with different frequencies on various subgroups. Some medic material was found in all quadrats on three subgroups and in nearly all fields and the majority of quadrats on the soils of the other. Medicago denticulata Willd. dominated one subgroup, occurring in all quadrats of all fields sampled. This species also occurred in approximately three quarters of the fields and half the quadrats sampled on two other subgroups, and was found in half the fields and a quarter of the quadrats of the fourth subgroup. Medicago minima (L.) Bart. showed a contrary preference, occurring with only slight frequency on the first, and with greatest frequency on the fourth subgroup. Medicago laciniata (L.) Mill. and Medicago tribuloides Desr. were of an intermediate nature and occurred principally on soils of the second and third subgroups. Medicago praecox DC. was found only on soils of the fourth subgroup and at low frequency. The nature of associations between medics showed that differences existed between subgroups of soils with respect to the preference of one species or another for them.

Corals of the Solitary Islands, New South Wales

1974 ◽  
Vol 25 (2) ◽  
pp. 193 ◽  
Author(s):  
JEN Veron ◽  
RA How ◽  
TJ Done ◽  
LD Zell ◽  
MJ Dodkin ◽  
...  
Keyword(s):  
Dominant Species ◽  
New South ◽  
New South Wales ◽  
Ocean Floor ◽  
Ocean Temperature ◽  
South West ◽  
South Wales ◽  
Acropora Hyacinthus ◽  
Hermatypic Corals ◽  
Australian Coastline

Thirty-four species of 18 genera of hermatypic corals and three species of ahermatypic corals occur at the Solitary Islands which lie between 2 and 11 km from the east Australian coastline between 30�01' and 30�14' S. latitude. The appearance and occurrence of each species is described and their inter-island distribution discussed. Transect data from South-west Solitary Island show that dominant species (Goniastrea australensis, cf. Plesiastrea versipora, Favites abdita, Favites halicora, Cyphastrea serailia, Turbinaria danae, Goniopora lobata, Pocillopora danicornis and Acropora hyacinthus) form a 100% cover of the ocean floor in some localities, whereas in others they form a variety of associations with the ascidians, sponges and algae characteristic of equivalent mainland localities. These findings are compared with previously reported distributions of temperate Australian hermatypic corals and are discussed in the light of recent data on the ocean temperature around the Solitary Islands.

Patterns of Abundance in Grassy Vegetation of the New-England Tablelands; Identifying Regional Rarity in a Threatened Vegetation Type

1993 ◽  
Vol 41 (1) ◽  
pp. 49 ◽  
Author(s):  
S Mcintyre ◽  
Z Huang ◽  
AP Smith
Keyword(s):  
New England ◽  
Dominant Species ◽  
Vegetation Type ◽  
New South ◽  
New South Wales ◽  
Canopy Cover ◽  
Native Grasses ◽  
European Settlement ◽  
South Wales ◽  
Dicot Species

A survey of understorey species in grassy vegetation was conducted at 120 sites on the New England Tablelands (part of the northern tablelands of New South Wales), and the frequency of 371 taxa is presented. Very few species were common and the majority were recorded at < 5% of the sites. Similar patterns of abundance were also observed within the quadrats. Only 16% of taxa achieved dominance (i.e. > 10% canopy cover ) in any of the sampled quadrats, and while the average richness was 28 species (per 30 m²), the average number of dominant species per quadrat was only 1.6. The main dominants were perennial gasses. Of the native grasses thought to dominate this vegetation type at the time of European settlement, it would seem that Poa sieberiana has not declined. In contrast, Sorghum leiocladum and to a lesser extent Themeda australis appear to have declined. Although some native dicot species were very frequent, they rarely achieved dominance in the vegetation. These observations support the notion that sparseness may be a more common form of rarity than has been previously recognised.

Frequencies of annual species of Medicago on brown acid soils of the Macquarie region of New South Wales

1964 ◽  
Vol 15 (1) ◽  
pp. 50 ◽  
Author(s):  
FW Hely ◽  
J Brockwell
Keyword(s):  
High Frequency ◽  
New South ◽  
New South Wales ◽  
Low Frequency ◽  
Acid Soils ◽  
Annual Species ◽  
Annual Legumes ◽  
South Wales ◽  
Soil Landscape ◽  
Landscape Units

The distribution of naturalized annual species of Medicago (medics) was studied on the brown acid soils of the Macquarie region of New South Wales, an area approximately 80 miles by 40 miles in extent. Four soil-landscape units were defined and one of these units was subdivided geographically into three parts. Four medics were found: Medicago minima (L.) Bart. and Medicago laciniata (L.) Mill. were by far the dominant annual legumes, occurring in many places at high frequency; Medicago denticulata Willd. and Medicago praecox DC. occurred at few sites and only at low frequency. Marked differences with respect to frequencies of medics were found both between soil-landscape units and the geographical subdivisions. On each unit and subdivision the frequency of M. minima in quadrats was consistently higher than that of M. laciniata. Association between M. minima and M. laciniata in quadrats was variable, but tended to be positive where these two medics occurrcd at low frequency and negative where they occurred at high frequency.

Factors Associated With Density of Mitchell Grass Pastures in North-Western New South Wales.

1997 ◽  
Vol 19 (1) ◽  
pp. 40 ◽  
Author(s):  
AM Bowman ◽  
DJ Munnich ◽  
KY Chan ◽  
J Brockwell
Keyword(s):  
Plant Density ◽  
Rhizobium Meliloti ◽  
New South ◽  
New South Wales ◽  
Good Condition ◽  
Grazing Pressure ◽  
Annual Species ◽  
Basal Diameter ◽  
Poor Condition ◽  
South Wales

Thirty-eight paddocks on 23 properties in the Walgett Shire of north-westem New South Wales were surveyed in April and May 1993 to identify factors that affected Mitchell grass (Astrebla lappacea) plant density. Low densities of Mitchell grass were associated with the occurrence of at least one flood in the last 20 years. Soils from paddocks described by landholders as in poor condition, and where Mitchell grass density was low, were more alkaline and had significantly higher electrical conductivity than soils from paddocks described as in good condition, and where Mitchell grass density was high. Paddocks in poor condition had higher organic carbon and mineralisable nitrogen levels and higher soil populations of Rhizobium meliloti. These latter characteristics were attributed to these pastures having a high component of annual species, including Medicago species, which returned substantial amounts of carbon and nitrogen to the soil. Where Mitchell grass density was moderate, other palatable species were common and biodiversity was high. However, in paddocks with the lowest densities of Mitchell grass, both annual species and unpalatable perennials were common. Low basal diameter of Mitchell grass plants and low Mitchell grass density, were associated with higher grazing pressure. The data suggested that the Mitchell grass ecosystem in north-westem New South Wales is prone to deterioration on the more alkaline and saline soils and where inundation by flooding or waterlogging is common.

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