| comparative genetic study confirms exceptionally low genetic variation in the ancient and endangered relictual conifer, wollemia nobilis (araucariaceae). | the wollemi pine, wollemia nobilis (araucariaceae), was discovered in 1994 as the only extant member of the genus, previously known only from the fossil record. with fewer than 100 trees known from an inaccessible canyon in southeastern australia, it is one of the most endangered tree species in the world. we conducted a comparative population genetic survey at allozyme, amplified fragment length polymorphism (aflp) and simple sequence repeat (ssr) loci in w. nobilis, araucaria cunninghamii and ... | 2003 | 12919472 |
| woody species diversity influences productivity and soil nutrient availability in tropical plantations. | we investigated the relationship between plant diversity and ecological function (production and nutrient cycling) in tropical tree plantations. old plantations (65-72 years) of four different species, namely araucaria cunninghamii, agathis robusta, toona ciliata and flindersia brayleyana, as well as natural secondary forest were examined at wongabel state forest, in the wet tropics region of queensland, australia. two young plantations (23 years) of araucaria cunninghamii and pinus caribaea wer ... | 2007 | 17899202 |
| labdane diterpenoids and shikimic acid derivatives from araucaria cunninghamii. | four new (1-4) and two known compounds (5, 6) were isolated from the aerial parts of araucaria cunninghamii. by analysis of uv, ir, ms, and nmr, the new compounds were identified as ent-19-(z)-coumaroyloxylabda-8(17),13(16),14-triene (1), ent-19-( e)-coumaroyloxylabda-8(17),13(16),14-triene (2), shikimic acid n-butyl ester (3), and 5-(z)-coumaroyloxyquinic acid n-butyl ester (4). compounds 1 and 6 exhibited inhibitory activity against escherichia coli, and compound 1 also exhibited moderate acti ... | 2010 | 21104610 |
| mechanical stability of trees under dynamic loads. | tree stability in windstorms and tree failure are important issues in urban areas where there can be risks of damage to people and property and in forests where wind damage causes economic loss. current methods of managing trees, including pruning and assessment of mechanical strength, are mainly based on visual assessment or the experience of people such as trained arborists. only limited data are available to assess tree strength and stability in winds, and most recent methods have used a stat ... | 2006 | 21642099 |
| [effects of forest type on soil organic matter, microbial biomass, and enzyme activities]. | taking the typical forest types pinus elliottii var. elliotttii, araucaria cunninghamii, and agathis australis in southern queensland of australia as test objects, an investigation was made on the soil soluble organic carbon (soc) and nitrogen (son), microbial biomass c (mbc) and n (mbn), and enzyme activities, aimed to understand the effects of forest type on soil quality. in the three forests, soil soc content was 552-1154 mg kg(-1), soil son content was 20.11-57.32 mg kg(-1), soil mbc was 42- ... | 2011 | 22263459 |
| drought avoidance and vulnerability in the australian araucariaceae. | the araucariaceae is an iconic tree family. once globally important, the araucariaceae declined dramatically over the cenozoic period. increasing aridity is thought to be responsible for extinction and range contraction of araucariaceae in australia, yet little is known about how these trees respond to water stress. we examined the response to water stress of the recently discovered tree wollemia nobilis jones, w.g., hill, k.d. & allen, j.m. (araucariaceae) and two closely related and widespread ... | 2016 | 26612850 |
| termite incidence on an araucaria plantation forest in teluk bahang, penang. | a study was carried out to evaluate the incidence of termite attack on an araucaria cunninghamii plantation at teluk bahang forest park (tbfp), penang. the hilly plantation area was surveyed to determine the diversity of termite species present. termite specimens were collected from standin araucaria trees, underground monitoring (aggregation) stations, fallen logs, forest litter and mounds (nests). seven species of termites were identified from 6 genera; coptotermes curvignathus, schedorhinoter ... | 2011 | 26467826 |
| the use of natural abundance stable isotopic ratios to indicate the presence of oxygen-containing chemical linkages between cellulose and lignin in plant cell walls. | qualitative and quantitative understanding of the chemical linkages between the three major biochemical components (cellulose, hemicellulose and lignin) of plant cell walls is crucial to the understanding of cell wall structure. although there is convincing evidence for chemical bonds between hemicellulose and lignin and the absence of chemical bonds between hemicellulose and cellulose, there is no conclusive evidence for the presence of covalent bonds between cellulose and lignin. this is cause ... | 2010 | 20362306 |
| branchlet nutrient concentration in hoop pine (araucaria cunninghamii) relative to family, stable carbon and oxygen isotope ratios and growth rate in contrasting environments. | genetic variation in branchlet nutrient (n, p, k, na, ca, mg, mn and fe) concentrations and mineral concentration (sum of branchlet p, k, na, ca, mg, mn and fe concentrations) of 8-9-year-old hoop pine (araucaria cunninghamii ait. ex d. don) half-sib families was assessed for four canopy positions at a wet site (23 families) and two canopy positions at an n- and water-limiting dry site (22 families) in relation to tree growth and associated branchlet carbon (delta13c) and oxygen (delta18o) isoto ... | 2003 | 12777240 |
| variation in branchlet delta13c in relation to branchlet nitrogen concentration and growth in 8-year-old hoop pine families (araucaria cunninghamii) in subtropical australia. | carbon isotope composition (delta13c) of branchlet tissue at nine canopy positions, and nitrogen concentration (n(mass)) at four canopy positions, were assessed in 8-year-old hoop pine (araucaria cunninghamii ait. ex d. don) trees from 23 half-sib families, grown in six blocks of a progeny test in southeastern queensland, australia. there was considerable variation among sampling positions, families and blocks in both delta13c and n(mass). the delta13c was positively related to n(mass) only for ... | 2000 | 11305459 |
| comparing plant life histories using elasticity analysis: the importance of life span and the number of life-cycle stages. | recent studies have used transition matrix elasticity analysis to investigate the relative role of survival (l), growth (g) and fecundity (f) in determining the estimated rate of population increase for perennial plants. the relative importance of these three variables has then been used as a framework for comparing patterns of plant life history in a triangular parameter space. here we analyse the ways in which the number of life-cycle stages chosen to describe a species (transition matrix dime ... | 1995 | 28306916 |