Spatial regression models were used to predict yields (kg?ha?1?yr?1) of nitrogen (N) and phosphorus (P) discharged from catchments throughout New Zealand under natural and current conditions. The models were derived using loads (kg?yr?1) of TN, NO3-N, TP and DRP calculated for 592 river water quality monitoring sites. Anthropogenic increases in yields above natural levels were associated with the proportions of catchments occupied by the intensive agricultural land cover and were unevenly distributed across regions. Anthropogenic increases in national loads of TN, NO3-N, TP and DRP exported to the ocean were 74%, 159%, 48% and 18%, respectively. Increases in loads exported to the ocean varied considerably at smaller scales, with catchments having significant load increases between 4- and 26-fold for N and 6- to 9-fold for P. Predictions of yields and loads reported here have utility in the development of strategies to manage nutrients. 相似文献
Bat guano cores have been used as a source of palaeoenvironmental information to aid in the reconstruction of past climates and vegetation. We collected a 104‐cm‐long (43 cm compacted) guano core from Fern Cave, Alabama, USA, that provided a c. 6000‐year record of guano accumulation. Pollen, nutrients (C, N, P) and stable isotopes (δ13C, δ15N) were measured on the guano core with the objective of reconstructing the environmental history of the area from the mid‐Holocene to present. Our data indicate that bats have utilized Fern Cave for at least 6000 years and that Woodland Indians also utilized the cave for a short period. A 3‐cm charcoal layer was dated to 2720±30 cal. a BP and inferred to be Woodland Indian in origin from microscopic inspection and thickness. Pollen and geochemical data showed that bat diets changed in the late Holocene possibly linked to food supply and climate changes. These results demonstrate that guano cores are a useful tool of palaeoenvironmental reconstruction when other forms of palaeorecords do not exist and can add to local archaeological information. 相似文献
This paper presents a detailed spectral pixel (spaxel) analysis of the ten Luminous Infrared Galaxies (LIRGs) previously observed with the Wide Field Spectrograph (WiFeS), an integral field spectrograph mounted on the ANU 2.3 m telescope, and for which an abundance gradient analysis has already been presented by Rich et al. (Astrophys. J., 753:5, 2012). Here we use the strong emission line analysis techniques developed by Dopita et al. (Astrophys. J. Suppl. Ser., accepted, 2013) to measure the ionisation parameter and the oxygen abundance in each spaxel. In addition, we use the observed Hα flux to determine the surface rate of star formation ($\mathrm {M}_{\odot }{\rm yr}^{-1}$kpc?2) and use the [S II] λλ6717/6731 ratio to estimate the local pressure in the ionised plasma. We discuss the correlations discovered between these physical quantities, and use them to infer aspects of the physics of star formation in these extreme star forming environments. In particular, we find a correlation between the star formation rate and the inferred ionisation parameter. We examine the possible reasons for this correlation, and determine that the most likely explanation is that the more active star forming regions have a different distribution of molecular gas which favour higher ionisation parameters in the ionised plasma. 相似文献
Predictions of solar flux and limb darkening calculated from the Utrecht Reference Model, the Mutschlecner model, and the Bilderberg Continuum Atmosphere are compared with the rocket ultraviolet observations. The calculations employ recent experimental and theoretical determinations of metallic photo-ionization cross-sections. The spectral region between the continuous absorption edge from the first excited level of silicon at 1680 Å and the ground-state absorption edge at 1525 Å proves particularly significant for an investigation of the solar temperature minimum. The analysis indicates that the solar temperature minimum is relatively broad and flat, having a nearly constant temperature over somewhat more than a scale height, and that the chromospheric rise occurs just above 5000 = 10–4 or so. Within the assumptions of the present models, a satisfactory interpretation of the ultraviolet spectrum can be reached with a temperature minimum of 4600° ± 100 °K. 相似文献
Like Australia as a whole, South Australia experienced rapid industrialisation from the 1930s, but employment growth rates in the state were generally well above national levels. Conversely, restructuring of Australian manufacturing since the mid 1970s has had especially severe consequences in the state. This paper documents and seeks to explain the distinctive pattern of industrial change in South Australia. Drawing on the contemporary literature on geographically uneven development, it argues that the state's experience must be explored in the wider context of the dynamics of capitalist development. International, national and local forces have combined in a complex fashion to produce the specific pattern of manufacturing growth and restructuring evident in South Australia. Analysis focuses on the activities of capital, labour and the institutions of the state, key agents of economic change. 相似文献
An updated, annotated list of all tetrapods from the Adamantina, Uberaba and Marília formations (Bauru Group), which constitute some of the best studied Upper Cretaceous units in Brazil, is presented. Tetrapod diversity in the Bauru Group is remarkable, including an admixture of typically austral Gondwanan taxa (e.g., abelisaurids, notosuchians) and boreal Gondwanan forms (e.g., carcharodontosaurids). Of note is the absence of Laurasian taxa in the upper portion of the Bauru Group. With the exception of some turtles, an anuran, mesoeucrocodylians and one titanosaur, most taxa from the Bauru Group are based on fragmentary and isolated bones, and as such many specimens can be identified only to a higher taxonomic level. Fishes, turtles, anurans, mesoeucrocodylians, dinosaurs, birds and mammals from the Adamantina and Marília formations resemble the latest Late Cretaceous vertebrate faunas from southern South America, except for the absence of ornithischian dinosaurs. 相似文献
Australian higher education has experienced substantial change since the early 1980s, with a transition to mass higher education, closer alignment to national political objectives, increasing Federal Government control, a growing emphasis on ‘quality’ and ‘value for money’, and organisational restructuring with manifestations ranging from the creation of the Unified National System to the merger or closure of individual departments. At the same time, evolving conceptions of learning and new patterns of demand, with growing emphasis on lifelong learning and flexible access to education, pose new challenges for educators. Now, the policies of the new Federal Coalition Government are likely to engender further change, with growing differentiation of universities a probable outcome. Information technology has so far played a relatively peripheral role in teaching and learning in higher education, but important changes there, including rapid shifts in the relationship between cost and computing power, and the explosive emergence of the World Wide Web, are now providing the basis on which information technology can become increasingly central to teaching and learning. Higher education is close to the limits of incremental adjustment to pressures for change and it seems likely that it will experience major restructuring, with its eventual reconstruction around the capabilities of information technology. Geography has already been much affected by restructuring pressures, including above‐average growth in teaching loads and threats to its disciplinary identity because of internal reorganisation of many universities. Despite a tradition of innovative, high‐quality teaching, geography has not generally been a leader in the development and application of information technology. Nevertheless, a case study of an experimental use of the World Wide Web provides an example of directions that teaching and learning in the discipline might take. 相似文献
AUSTRALIA: A GEOGRAPHY. Volume 1: The Natural Environment edited by D. N. Jeans. 18 × 25 cm, viii and 347 pages. Sydney University Press: Sydney 1986 (ISBN 0 424 00114 4) $A55.00 (hard); (ISBN 0 424 00124 1) $A32.50 (soft).
Western Australia. Departments of Education and Lands and Survey (1979) Western Australia: an atlas of human endeavour, 1829–1979, Government Printer, Perth.
ATLAS OF SOUTH AUSTRALIA edited by T. Griffin and M. McCaskill. 28 × 40 cm, xiv and 134 pages. South Australian Government Printing Division and Wakefield Press on behalf of the South Australian Jubilee 150 Board: Adelaide 1986 (ISBN 0 7243 46880) $A55.00 (hard).
URBAN AUSTRALIA: Planning Issues and Policies edited by S. Hamnett and R. Bunker. 16 × 24 cm, 192 pages. Nelson Wadsworth: Melbourne 1987 (ISBN 0 17 007166 9) $A29.95 (hard).
AUSTRALIAN URBAN DEVELOPMENT AND INTERNATIONAL FINANCE CAPITAL (Working Paper No. 31) by M. T. Daly. 21 × 30 cm, viii and 39 pages. Transnational Corporations Research Project, University of Sydney 1985 (ISBN 0 908470 66 5) $A5.00 (soft).
TRANSNATIONAL CAPITAL AND URBANIZATION IN JAPAN (Research Monograph No. 25) by M. Douglass. 21 × 30 cm, viii and 42 pages. Transnational Corporations Research Project, University of Sydney 1987 (ISBN 0 908470 74 6) $A10.00 (soft).
MELBOURNE WESTERN REGION: Industrial Sites Atlas by Melbourne Western Region Joint Working Group. 45 × 32 cm, 40 pages. Melbourne Western Region Joint Working Group: Melbourne 1984 $A20.00 (soft).
MINE INFRASTRUCTURE AND ECONOMIC DEVELOPMENT IN NORTHERN AUSTRALIA by C. O'Faircheallaigh. 18 × 25 cm, vi and 87 pages. North Australia Research Unit, Australian National University: Darwin 1987 (ISBN 0 7315 0043 1) $A10.00 (soft).
AUSTRALIA'S CHANGING POPULATION: Trends and Implications by G. Hugo. 16 × 24 cm, x and 354 pages. Oxford University Press: Melbourne 1986 (ISBN 0 19 554680 6) $A40.00 (hard).
WOMEN OVER SIXTY: A Study of the Housing, Economic and Social Circumstances of Older Women (Publication No. 130) by L. Coleman and S. Watson. 17 × 24 cm, v and 89 pages. Australian Institute of Urban Studies: Canberra 1987 (ISBN 0 86419 112 X).
THE MANNING VALLEY: Landscape and Settlement 1824–1900 by W. K. Birrell. 21 × 29 cm, xvi and 280 pages. Jacaranda: Milton, Qld, 1987 (ISBN 0 7016 2170 2) $A29.95 (hard).
ISSUES IN THE MANAGEMENT OF AUSTRALIA'S WATER RESOURCES by J. J. Pigram. 15 × 23 cm, xvi and 331 pages. Longman Cheshire: Melbourne 1986 (ISBN 0 582 71139 8) $A24.95 (soft).
PROSPECTS FOR HARDWOOD FORESTS (Monograph No. 19) edited by J. Dargavel and G. Sheldon. 16 × 23 cm, xv and 334 pages. Centre for Resource and Environmental Studies, Australian National University, Canberra 1987 (ISBN 0 86740 226 1) $A19.95 plus $A5.00 post and packing (soft).
FOREST SOILS AND NUTRIENT CYCLES by P. M. Attiwill and G. W. Leeper. 15 × 22 cm, x and 202 pages. Melbourne University Press: Melbourne 1987 (ISBN 0 522 84315 8) $A29.90 (hard).
AUSTRALIAN SOILS: The Human Impact edited by J. S. Russell and R. F. Isbell. 26 × 18 cm, xi and 522 pages. University of Queensland Press: St Lucia 1986 (ISBN 0 7022 1968 1) $A50.00 (hard).
THE AUSTRALIAN SUMMER MONSOON, TELECONNECTIONS, AND FLOODING IN THE LAKE EYRE BASIN (South Australian Geographical Papers No. 2) by R. J. Allen. 18 × 25 cm, 47 pages. Royal Geographical Society of Australasia (South Australian Branch): Adelaide 1985 (ISBN 0 909112 09 6). 相似文献
