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51.
Jouni Lehtoranta Petri Ekholm Stella Wahlström Petra Tallberg Risto Uusitalo 《Ambio》2015,44(2):263-273
Coastal eutrophication is expected to increase due to expanding and intensifying agriculture which causes a large amount of soil-associated P to be transported into aquatic systems. We performed anaerobic long-term incubations on field soil to mimic the conditions that eroded soil encounters in brackish sediments. The release of P from soil increased with the amount of labile organic C (acetate) addition and decreased with the soil/solution ratio. We deduce that in less-productive brackish systems, microbial Fe reduction allows for the maintenance of the coupled cycling of Fe and P and restricts the amount of P entering the oxic water. In more eutrophic systems, the formation of Fe sulfides as a result of SO4 reduction inactivates Fe, and leads to a higher release of P, thus generating an adverse feedback effect. The dependence of the fate of soil-bound Fe and P on the trophic status of the receiving water should be recognized in eutrophication management. 相似文献
52.
Dianne Gardner James Carlopio Petra N. Fonteyn Jean A. Cross 《International journal of occupational safety and ergonomics》2013,19(1):59-71
This paper presents findings from an extensive study intofactors that impact upon the high rate of injuries due to mechanical equipment, especially in small manufacturing firms. Issues relating to knowledge of health and safety issues and to management practices have been shown to be extremely important with regards to safety in smaii businesses. Knowledge and awareness of hazards were found to be relatively low and few respondents, especially managers, had received adequate safety training. Managers did not regard the identification and control of risks as a priority. Workplaces generally lacked effective safety management procedures such as safety rules and regulations, procedures for recording and learning from accidents, and clearly defined responsibilities for safety. Some issues requiring further investigation, and some recommendations for improving safety in small businesses, are presented. 相似文献
53.
Petra N. Fonteyn Diana Olsberg Jean A. Cross 《International journal of occupational safety and ergonomics》2013,19(1-2):41-57
This article reports the results of a study investigating the nature and extent of small manufacturing business owners’ knowledge of Occupational Health and Safety (OHS) issues. Interviews were conducted with 33 owners of small manufacturing businesses in Sydney, Australia. Results showed that whereas the majority of owners had basic awareness of the existence of OHS legislation, they were often unaware about the extent of their legal OHS responsibilities. Owners were found to have minimal OHS training and practical OHS expertise. Lack of appropriate industry specific OHS information was found to be a major factor that inhibited the owners’ ability to deal with OHS issues effectively. 相似文献
54.
The contributions of local community action groups to environmental care and restoration is usually justified and evaluated in terms of improvements to environmental quality. This article explores social benefits in the form of increases in social capital and action competence that also flow from their actions, benefits that may not only help restore degraded but also contribute to the stock of good will and skill in the community that may even prevent or minimise future environmental problems. This article documents the emergence of action competence and social capital in two community catchment groups in South-East Queensland. The findings suggest that social capital is enhanced through processes of community participation in the catchment consultation processes. The article concludes that the relationship between social capital and action competence is complementary, with social capital and action competence being mutually enhanced by the social learning that accrues from the process of community participation. 相似文献
55.
56.
The contributions of local community action groups to environmental care and restoration is usually justified and evaluated in terms of improvements to environmental quality. This article explores social benefits in the form of increases in social capital and action competence that also flow from their actions, benefits that may not only help restore degraded but also contribute to the stock of good will and skill in the community that may even prevent or minimise future environmental problems. This article documents the emergence of action competence and social capital in two community catchment groups in South-East Queensland. The findings suggest that social capital is enhanced through processes of community participation in the catchment consultation processes. The article concludes that the relationship between social capital and action competence is complementary, with social capital and action competence being mutually enhanced by the social learning that accrues from the process of community participation. 相似文献
57.
Solid-state 15N NMR was applied to the aqueous extracts of a 13C-enriched plant slurry (Lolium perenne), anaerobically incubated with 15N3-trinitrotoluene (TNT). Almost all 15N3-TNT transformation products became covalently bound to the plant-derived organic material extractable with water. DCPMAS
15N 13C NMR revealed a three-step reaction scheme. After reduction of TNT, the aryl amines are acetylated. Subsequent alkylation
of the resulting amides strengthens the incorporation of TNT-transformation products into humic material. Comparable results
have been recently obtained under aerobic conditions, which indicates that this pathway is a common process during biological
TNT transformation. 相似文献
58.
Glucocorticosteroids (GCs) of the hypothalam–pituitary–adrenal axis play a role in association with both stressful events
and daily life processes. However, relatively little is known about the role of GCs in relation to daily and seasonal life
processes in animals in the wild. In this paper, we present data on basal levels of plasma corticosterone CORT in chicks of
a pelagic seabird, the thin-billed prion, Pachyptila belcheri, during two predictable changes in demands, the daily activity pattern and the preparation for fledging. By comparing chicks
fed recently with unfed chicks, we test how GC levels are modified according to nutritional condition. In accordance with
their nocturnal feeding rhythm, chicks had a clear daily rhythm with increased CORT secretion at night, but CORT levels during
the active phase were also highly elevated in unfed chicks compared with fed chicks. Close to fledging, chicks rapidly increased
basal CORT levels, and again unfed chicks had higher levels than fed chicks, although the age effect here was stronger than
the effect of recent feeding. The present data thus support the hypothesis that GC levels are adjusted to life stages with
predictable changes in demands, but food availability and/or internal energy stores also affect the level to which GCs increase. 相似文献
59.
Šmuc NR Dolenec T Serafimovski T Tasev G Dolenec M Vrhovnik P 《Environmental geochemistry and health》2012,34(4):513-526
Heavy metal contamination of soils is widespread and induces a long-term risk to ecosystem health. This research focuses on the heavy metal contamination, transfer values and risk assessment in the Ko?ani Field plant system (Republic of Macedonia). To identify the heavy metal concentrations in Ko?ani crops (rice and maize), the geochemical analysis was performed by inductive coupled plasma mass spectrometer and thereupon the transfer factor (TF) and estimated daily intake amount values were calculated. The highest As, Cd, Mo, Pb and Zn values were determined in the rice samples grown in the paddy fields near the Zletovska River. The highest Pb and Mo concentrations measured in the maize samples were from the maize fields near the Zletovska River and Ciflik city. High TF values for Mo, Zn, Cd and Cu revealed a strong accumulation of Mo, Zn and Cd by rice and Mo and Zn by maize crops. The results of the estimated daily intake showed that the regular consumption of rice and maize crops containing the highest Cd, Mo, Pb and Zn concentrations could pose a serious threat to human health, because the daily intake of Cd, Mo, Pb and Zn for crops grown in the fields around the Zletovska River exceeded the recommended provisional tolerable daily intake values. Taking into account the results, the area around Zletovska River is considered as the most anthropogenically impacted part of Ko?ani Field. 相似文献
60.
While the effects of contemporaneous local environment on species richness have been repeatedly documented, much less is known about historical effects, especially over large temporal scales. Using fen sites in the Western Carpathian Mountains with known radiocarbon-dated ages spanning Late Glacial to modern times (16 975-270 cal years before 2008), we have compiled richness data from the same plots for three groups of taxa with contrasting dispersal modes: (1) vascular plants, which have macroscopic propagules possessing variable, but rather low, dispersal abilities; (2) bryophytes, which have microscopic propagules that are readily transported long distances by air; and (3) terrestrial and freshwater mollusks, which have macroscopic individuals with slow active migration rates, but which also often possess high passive dispersal abilities. Using path analysis we tested the relationships between species richness and habitat age, area, isolation, and altitude for these groups. When only matrix-derived taxa were considered, no significant positive relation was noted between species richness and habitat size or age. When only calcareous-fen specialists were considered, however, habitat age was found to significantly affect vascular plant richness and, marginally, also bryophyte richness, whereas mollusk richness was significantly affected by habitat area. These results suggest that in inland insular systems only habitat specialist (i.e., interpatch disperser and/or relict species) richness is influenced by habitat age and/or area, with habitat age becoming more important as species dispersal ability decreases. 相似文献