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281.
Mike R. Scarsbrook Chris G. McBride Graham B. McBride Graham G. Bryers 《Journal of the American Water Resources Association》2003,39(6):1435-1447
ABSTRACT: Associations between the El Nino Southern Oscillation (ENSO) climate pattern and temporal variability in flow and 12 water quality variables were assessed at 77 river sites throughout New Zealand over a 13‐year period (1989 through 2001). Trends in water quality were determined for the same period. All 13 variables showed statistically significant linear regression relationships with values of the Southern Oscillation Index (SOI). The strongest relationships were for water temperature (mean R2= 0.20), dissolved reactive phosphorus (0.18), and oxidized nitrogen (0.17). The association with SOI varied by climate region. The observed patterns were generally consistent with known ENSO effects on New Zealand rainfall and air temperature. Trends in water quality variables for the periods 1989 through 1993, 1994 through 1998, and 1989 through 1998 were reasonably consistent with trends in SOI, even when the influence of river flow was removed from the data. This suggests that SOI effects on water quality are not necessarily a direct consequence of changes in flow associated with rainfall variation. In addition, both Baseline (32 upstream) and Impact (45 downstream) sites showed similar trends, indicating that changes in management were not directly responsible. We conclude that interpretation of long term water quality datasets in rivers requires that climate variability be fully acknowledged and dealt with explicitly in trend analyses. 相似文献
282.
K. M. Shamsul Haque Philip L. Eberbach Leslie A. Weston Mike Dyall-Smith Julia A. Howitt 《Chemistry and Ecology》2016,32(2):182-200
Flooding of wetland or agricultural soils can result in substantial alteration of the pore water trace metal profiles and potentially also influence the bioavailability of other trace elements adsorbed to the insoluble oxides. Experimental microcosms were used to quantify the impact of rice (Oryza sativa) plants across an entire growing cycle on the concentrations of Mn2+ and Fe2+ in two soil types (red sodosol and grey vertosol). Two water management treatments were included: a standard flooded treatment and a saturated treatment (?3?kPa). Soil pore water profiles were established from samples collected at four sampling depths (2.5, 7.5, 15 and 25?cm) on 50 occasions. Fe2+ and Mn2+ concentrations were higher in flooded soil than in saturated soil and greatest at a depth of 7.5?cm. The presence of rice plants increased Mn2+ concentrations in flooded soils, but tended to decrease Mn2+ concentrations in saturated soils. The influence of rice plants on Fe2+ concentrations was greatest at a depth of 7.5?cm. Changes in soil pore water Fe2+ and Mn2+ concentrations due to the presence of rice plants were correlated with flowering and reproduction. 相似文献
283.
The connections between people, parks, and tourism have received significant attention in recent years, recognizing the potential for mutually beneficial relationships. Ecotourism has been promoted and widely adopted as a strategy for funding conservation initiatives, while at the same time contributing to the socioeconomic development of host communities and providing for quality tourism experiences. Parks are among the most common ecotourism destinations. Employing interviews, observations and secondary sources, this study assesses the current status of ecotourism at two protected areas in Hainan, China, where it is being promoted as a strategy for balancing regional economic growth and conservation objectives. Through an evaluation of the existing tourism–park–community relationships, opportunities and constraints are identified. Ecotourism development was found to be at an early stage at both study sites. Socioeconomic benefits for the local communities have been limited and tourism activity has not contributed revenues towards conservation to date. Community residents, nevertheless, generally support conservation and are optimistic that tourism growth will yield benefits. In light of the study findings and the salient literature, planning direction is offered with the intention of enhancing the capacity of ecotourism to generate benefits for both communities and the parks, and thus contribute to the sustainable development of the region more generally. Lessons derived have broad applicability for ecotourism destinations elsewhere. 相似文献
284.
Slaton NA Brye KR Daniels MB Daniel TC Norman RJ Miller DM 《Journal of environmental quality》2004,33(5):1606-1615
Knowledge of the balance between nutrient inputs and removals is required for identifying regions that possess an excess or deficit of nutrients. This assessment describes the balance between the agricultural nutrient inputs and removals for nine geographical districts within Arkansas from 1997 to 2001. The total N, P, and K inputs were summed for each district and included inorganic fertilizer and collectable nutrients excreted as poultry, turkey, dairy, and hog manures. Nutrients removed by harvested crops were summed and subtracted from total nutrient inputs to calculate the net nutrient balance. The net balances for N, P, and K were distributed across the hectarage used for row crop, hay, pasture, or combinations of these land uses. Row-crop agriculture predominates in the eastern one-third and animal agriculture predominates in the western two-thirds of Arkansas. Nutrients derived from poultry litter accounted for >92% of the total transportable manure N, P, and K. The three districts in the eastern one-third of Arkansas contained 95% of the row-crop hectarage and had net N and P balances that were near zero or negative. The six districts in the western two-thirds of Arkansas accounted for 89 to 100% of the animal populations, had positive net balances for N and P, and excess P ranged from 1 to 9 kg P ha(-1) when distributed across row-crop, hay, and pasture hectarage. Transport of excess nutrients, primarily in poultry litter, outside of the districts in western Arkansas is needed to achieve a balance between soil inputs and removals of P and N. 相似文献
285.
Sharpe M 《Journal of environmental monitoring : JEM》2003,5(1):4N-9N
As the EU launches its latest 17 billion research programme, which includes significant funding for environmental research, JEM takes a look at the trends in and dynamics of innovation in environmental analysis. 相似文献
286.
Differences between inland and coastal aquacultural production systems in Asia are discussed in terms of market orientation, resource allocation and property rights, and scale of operations. The production of shrimp grown in coastal brackish water ponds has featured prominently in aquacultural development programmes in Asia. Emphasis placed on capital-intensive shrimp production for export, however, has distracted attention from the potential of inland freshwater aquaculture to generate employment opportunities for rural people and food production for domestic consumers. The paper concludes with a discussion of an alternative policy direction for promoting aquacultural development on a socially sound basis, recognizing the need to balance equity and human nutrition with profitability and foreign exchange earnings. 相似文献
287.
288.
Munang Tingem Mike Rivington 《Mitigation and Adaptation Strategies for Global Change》2009,14(2):153-168
The Cameroonian agricultural sector, a critical part of the local ecosystem, is potentially vulnerable to climate change raising
concerns about food security in the country’s future. Adaptations policies may be able to mitigate some of this vulnerability.
This article investigates and addresses the issue of selected adaptation options within the context of Cameroonian food production.
A methodology is applied where transient diagnostics of two atmosphere–ocean general circulation models, the NASA/Goddard
Institute GISS and the British HadCM3, are coupled to a cropping system simulation model (CropSyst) to simulate current and
future (2020, 2080) crop yields for selected key crops (bambara nut, groundnut, maize, sorghum, and soybean) in eight agricultural
regions of Cameroon. Our results show that for the future, substantial yield increases are estimated for bambara groundnut,
soybean and groundnut, while little or no change or even decreases for maize and sorghum yields, varying according to the
climate scenario and the agricultural region investigated. Taking the “no regrets” principle into consideration, we explore
the advantages of specific adaptation strategies specifically for three crops viz. maize, sorghum and bambara groundnut, under
GISS A2 and B2 marker scenarios only. Changing sowing dates may be ineffective in counteracting adverse climatic effects because
of the narrow rainfall band that strictly determines the timing of farm operations in Cameroon. In contrast, the possibility
of developing later maturing new cultivars proved to be extremely effective in offsetting adverse impacts, giving the highest
increases in productivity under different scenario projections without management changes. For example, under climate change
scenario GISS A2 2080, a 14.6% reduction in maize yield was converted to a 32.1% increase; a 39.9% decrease in sorghum yield
was converted to a 17.6% increase, and for bambara groundnut (an under-researched and underutilised African legume), yields
were almost trebled (37.1% increase above that for sowing date alone (12.9%)) due to increase length of growing period and
the positive effects of higher CO2 concentrations. These results may better inform wider studies and development strategies on sustainable agriculture in the
area by providing an indication as to the potential direction in shifts in production capabilities. Our approach highlights
the benefit of using models as tools to investigate potential climate change impacts, where results can supplement existing
knowledge. The results provide useful guidance and motivation to public authorities and development agencies interested in
food security issues in Cameroon and elsewhere. 相似文献
289.
Kees Jan van Groenigen Astley Hastings Dermot Forristal Brendan Roth Mike Jones Pete Smith 《Agriculture, ecosystems & environment》2011,140(1-2):218-225
Soil tillage and straw management are both known to affect soil organic matter dynamics. However, it is still unclear whether, or how, these two practices interact to affect soil C storage, and data from long term studies are scarce. Soil C models may help to overcome some of these problems. Here we compare direct measurements of soil C contents from a 9 year old tillage experiment to predictions made by RothC and a cohort model. Soil samples were collected from plots in an Irish winter wheat field that were exposed to either conventional (CT) or shallow non-inversion tillage (RT). Crop residue was removed from half of the RT and CT plots after harvest, allowing us to test for interactive effects between tillage practices and straw management. Within the 0–30 cm layer, soil C contents were significantly increased both by straw retention and by RT. Tillage and straw management did not interact to determine the total amount of soil C in this layer. The highest average soil C contents (68.9 ± 2.8 Mg C ha?1) were found for the combination of RT with straw incorporation, whereas the lowest average soil C contents (57.3 ± 2.3 Mg C ha?1) were found for CT with straw removal. We found no significant treatment effects on soil C contents at lower depths. Both models suggest that at our site, RT stimulates soil C storage largely by decreasing the decomposition of old soil C. Extrapolating our findings to the rest of Ireland, we estimate that RT will lead to C mitigation ranging from 0.18 to 1.0 Mg C ha?1 y?1 relative to CT, with the mitigation rate depending on the initial SOC level. However, on-farm assessments are still needed to determine whether RT management practices can be adopted under Irish conditions without detrimental effects on crop yield. 相似文献
290.
Several innovative directions for landscape policy development and implementation have emerged over recent years. These include: (i) an expansion of scope to include all landscape aspects and landscape types, (ii) an increased emphasis on public participation, (iii) a focus on designing measures appropriate for different contexts and scales, and (iv) encouraging support for capacity-building. In this paper, we evaluate the extent to which these policy directions are reflected in the practice of academic landscape research. We evaluate all research papers published in three leading landscape journals over six years, as well as published research papers relating directly to the European Landscape Convention. The latter, which was adopted in 2000, establishes a framework for landscape protection, planning and management in Europe and is to date the only international legal instrument of its kind. Results indicate that whilst policy innovations do not appear to be a major stimulus for academic research, studies nevertheless address a range of landscape aspects, types and scales (albeit with a slight bias towards bio-physical landscape aspects). However, geographical representativeness of research is weak and dominated by the United States and northern/western Europe, and research capacity likewise appears to be unevenly distributed. Landscape research is also limited in the extent to which it involves stakeholders or develops innovative methods for doing so, notwithstanding that this remains a key challenge for policy-makers. Results point to the potential for landscape research to address areas (topical and geographical) which have received little attention to date, as well as suggesting mutual benefits of stronger links between policy and academia. 相似文献