Long-unburnt habitat is critical for the conservation of threatened vertebrates across Australia     

von Takach  Brenton  Jolly  Chris J.  Dixon  Kelly M.  Penton  Cara E.  Doherty  Tim S.  Banks  Sam C. 《Landscape Ecology》2022,37(6):1469-1482

Landscape Ecology - Increases in fire frequency, intensity and extent are occurring globally. Relative to historical, Indigenous managed conditions, contemporary landscapes are often characterised...  相似文献   

Friction velocity and aerodynamic roughness of conventional and undercutter tillage within the Columbia Plateau, USA     

Brenton Sharratt  Guanglong Feng 《Soil & Tillage Research》2009,105(2):236-241

Friction velocity (u_*) and aerodynamic roughness (z_o) at the soil–plant–atmosphere interface affect wind erosion, but no attempts have been made to quantify these parameters as affected by tillage systems within the Columbia Plateau region of the Pacific Northwest United States. Wind velocity profiles above adjacent field plots (>2 ha), with plots subject to conventional or undercutter tillage during the summer fallow phase of a winter wheat–summer fallow rotation, were measured over 50 high wind events (wind velocities in excess of 6.4 m s⁻¹ at a height of 3 m) during 2005 and 2006 near Lind, Washington to determine u_* and z_o of tillage treatments. Wheat stubble plots were subject to either conventional (disks) or undercutter (wide V-shaped blades) tillage in spring and then periodically rodweeded prior to sowing winter wheat in late summer. Prior to sowing, u_* for conventional and undercutter tillage respectively averaged 0.36 and 0.46 m s⁻¹ in 2005 and 0.38 and 0.40 m s⁻¹ in 2006 while z_o for conventional and undercutter tillage respectively averaged 2 and 7 mm in 2005 and 2 and 4 mm in 2006. The aerodynamically rougher surface of undercutter tillage was predicted to suppress vertical dust flux; this was collaborated with observations in the field where undercutter tillage reduced dust flux as compared with conventional disk tillage. Undercutter tillage, therefore, appears to be an effective management practice to roughen the surface and thereby suppress dust emissions from agricultural land subject to summer fallow within the Columbia Plateau.  相似文献   

Family Forest Owners’ Perceptions of Landowner Assistance Programs in the USA: A Qualitative Exploration of Program Impacts on Behaviour     

Kyle Andrejczyk  Brett J. Butler  Brenton J. Dickinson  Jaketon H. Hewes  Marla Markowski-Lindsay  David B. Kittredge  Michael A. Kilgore  Stephanie A. Snyder  Paul F. Catanzaro 《Small-Scale Forestry》2016,15(1):17-28

Using data collected from a series of focus groups, this study examines how landowner assistance programs (which may include management plans, cost-share, technical assistance and advice, and education components) affect family forest owner behaviour in the USA. Not surprisingly, most owners who participated in assistance programs had pre-existing management objectives. Participation in the management plan and cost-share components was found to facilitate the stewardship of private forests by assisting and reinforcing the behaviour of those landowners who already intend to manage their land in some pre-conceived manner. Advice and educational components appeared to do more in terms of introducing owners to new ideas. The mix of components offered as part of a landowner assistance program should consider the goals of the program and which components will be most effective in achieving those goals.  相似文献   

Resistance of Scots pine (Pinus sylvestris L.) wood modified with functionalized commercial silicone emulsions against subterranean termites     

Shyamal C. Ghosh  Brenton C. Peters  Chris J. Fitzgerald  Holger Militz  Carsten Mai 《Wood Science and Technology》2012,46(6):1033-1041

Scots pine (Pinus sylvestris L.) sapwood was treated with quat-silicone micro-emulsion (<40?nm), amino-silicone macro-emulsion (110?nm), alkyl-modified silicone macro-emulsion (740?nm) and solutions of inorganic water glass. Three treatment concentrations of 5, 15 and 30% (w/w) were used for the impregnation of the test specimens. Termite resistance was assessed following a 16-week field trial conducted in northern Queensland, Australia. Two different field sites were chosen for exposure to feeding by Coptotermes acinaciformis (Froggatt) and Mastotermes darwiniensis (Froggatt). Following exposure, the test and feeder specimens were inspected and assessed for termite damage using a visual rating system (from 10 sound to 0 completely destroyed) and individual mass losses. The specimens treated with quat- and amino-silicone emulsions resisted damage by both termite species, even at less than 15% weight percent gains (WPGs). Alkyl-modified silicone macro-emulsion and water glass treatment induced somewhat less resistance to termite damage, but imparted protection at higher WPGs.  相似文献   

A STUDY OF THE EPIDEMIOLOGY OF ANAPLASMA MARGINALE INFECTIONS OF CATTLE IN SOUTHERN QUEENSLAND: CLINICAL DISEASE AND THE PREVALENCE OF COMPLEMENT FIXING ANTIBODIES     

R J Rogers  G W Blight  S G Knott 《Australian veterinary journal》1978,54(3):115-120

SUMMARY A total of 386 clinical outbreaks of anaplasmosis were confirmed in Queensland south of the 22nd parallel over the period 1967 to 1976. Seventy-eight per cent of these outbreaks occurred during autumn and winter and only 6.8% involved cattle less than 1 year of age compared with 54.8% for cattle more than 3 years old. Dairy breeds were involved in 48.1% of 258 outbreaks compared with 51.9% for beef breeds. Bos taurus beef breeds were involved in 90.7% of 118 outbreaks compared with 9.3% for Bos indicus crossbreds. Approximately 3 times as much clinical disease per head of population was confirmed in tick (Boophilus microplus) infested southern Queensland south of the 25th parallel (south zone) than in areas between the 25th and 22nd parallel (north zone). A survey was conducted during 1975 in which 3,810 cattle from 241 herds were sampled on the basis of the distribution of the cattle population. The prevalence of CF reactors in tick-infested areas was 42.1% of 3,026 samples compared with 0.4% of 784 samples from tick-free areas. The prevalence in the north zone was 52.3% compared to 30.2% for the south zone and it also varied with the type of animal sampled. The prevalence in Bos taurus cattle was significantly greater than in Bos indicus types and it increased with age of the animal. No significant difference in susceptibility to infection attributable to sex could be demonstrated. Animals exposed to heavy to medium tick infestations had significantly more CF reactors than those exposed to light infestation. Higher stocking densities were associated with higher prevalence levels. Thus anaplasmosis is predominantly a disease of autumn and winter and of cattle greater than 1 year of age. Both clinical and subclinical infection occur only in tick-infested areas and B. microplus is considered to be the main, if not the only vector. Both clinical and inapparent infection are more frequent in Bos taurus than in Bos indicus types.  相似文献   

HAEMOLYTIC DISEASE OF NEWBORN CALVES IN A DAIRY HERD IN QUEENSLAND     

G. Langford  B.V.Sc.  S. G. Knott  B.V.Sc.  Corinne K.  Dimmock B.Sc.† P. Derrington  B.V.Sc.†† 《Australian veterinary journal》1971,47(1):1-4

  相似文献   

Keith McDonald Grant     

SG Knott  BA Woolcock 《Australian veterinary journal》2003,81(3):166-166

  相似文献   

Outcome of phacoemulsification in 71 cats: A multicenter retrospective study (2006‐2017)     

Elena Fenollosa‐Romero  Emily Jeanes  Ines Freitas  Andra‐Elena Enache  Rachel Lockhart  Lorraine Fleming  Timothy N. L. Knott  Charlotte Dawson  Kerry Smith  Claudia Busse 《Veterinary ophthalmology》2020,23(1):141-147

  相似文献   

VITAL RESEARCH OF AGRICULTURE     

Macgillivray JH  Hanna GC  Knott JE  Weier TE 《Science (New York, N.Y.)》1945,101(2615):143-144

  相似文献   

NMR relaxation times for soil texture estimation in the laboratory: A comparison to the laser diffraction and sieve–pipette methods     

Yonghui Peng  Kristina Keating  D. Brenton Myers 《European Journal of Soil Science》2021,72(2):918-933

  相似文献