首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到7条相似文献,搜索用时 0 毫秒
1.
This paper provides a broad survey of existing literature on contemporary solid waste management (SWM) in the Pacific region to underscore an urgent and compelling need for improved SWM. Despite advances in waste management systems and funding for technical support and capacity building from a range of sources, waste continues to threaten public and ecological health and the economy in Pacific Islands Countries and Territories (PICTs). SWM in the Pacific requires innovative thinking in a challenging environment of remoteness, limited available land, fragile ecosystems, vulnerability to natural hazards and subsequent climate sensitivity. Many PICTs are under considerable pressure to open their markets up to trade liberalisation. Increasing links to the global economy through trade liberalisation could either further exacerbate waste management challenges in the Pacific or contribute to environmental protection and sustainable development goals. The authors argue that if the PICTs' urgent waste management challenges are to be meaningfully addressed, the region's leaders must ensure trading partners conform to local environmental protection policies and that trade agreements align with sustainable development goals.  相似文献   

2.
Rapid population growth in Pacific island cities far exceeds employment opportunities and is contributing to rising urban inequality and social exclusions. Livelihoods in the informal urban sector, such as market vending, provide much needed income, rural–urban connectivity and food security, but remain largely excluded from policy and planning frameworks. Spatial, economic and social exclusions limit vendors’ economic advancement, their influence over decision‐making, and their access to basic services. Local communities close to informal markets fill some of the gaps left by the policy neglect, but investment and strategic management remains inadequate when vendors do not have secure market places and recognised rights to work. This article reports on a study of three informal markets in Honiara, Solomon Islands. These markets lack legal status but make significant contributions to urban development and economic opportunities. Drawing on surveys and focus groups with vendors and urban decision‐makers we explore the impact of informal markets on urban economies, how social and institutional relationships hinder vendors’ economic advancement, and the opportunities to create more inclusive livelihoods that could contribute to equitable cities.  相似文献   

3.
For many Polynesians migration is still framed within a particular spatial context, although on an enlarged scale – one that we have termed the New Polynesian Triangle. With its apexes in the North American continent to the east, Australia in the west and New Zealand in the south, this New Polynesian Triangle encompasses a particular field through which ongoing Polynesian migration and movement continues to occur. Movement within this New Polynesian Triangle is both multidimensional and multidirectional. While it is the movement of economic resources, particularly remittances, that has captured the interest of many agencies operating in the region, we argue that such economic flows are integrally linked with other flows – of goods, ideas, skills and culture – to form a single dynamic system of movement. Importantly, such flows are not uni‐directional (from ‘rich’ to ‘poor’ countries) as was assumed in times past. In developing ideas on the New Polynesian Triangle, we wish to move away from the dominant Western discourse of the Pacific Ocean as a barrier to development and movement and towards the reclamation of the ocean as a conduit and source of connection and movement for Pacific peoples.  相似文献   

4.
We suggest the value of considering Pacific Latin America and the South Pacific in relationship to each other in contexts of climate change and investment in extractive industry. The paper explores the interactions between extractive industry, climate change and environmental governance through the lenses of double exposure, double movements, resilience and risk. The first part of the paper addresses the nature and scope of investments in extractive industries in this ‘other Pacific’. The geography of these investments is changing the actual and perceived distribution of exposure and risk in the region. The nature of this risk is also being affected by climate change and its implications for the geographies of water and land‐use. Much of the contention surrounding extractive industries can be understood as conflicts over the unequal distribution of this risk, how to interpret its significance and the ways in which resilience might be enhanced to respond to it. The final section of the paper discusses the ways in which mining governance and governance for resilience converge and, on the basis of recent experiences in El Salvador, analyses the difficulties in governing extractive industry in a way that manages risk and builds resilience.  相似文献   

5.
The environmental situation and current yield performance of sugar beet production in Germany are described and compared to those in other European regions. A continuous increase in yield performance and enhanced technical quality have been achieved through progress in breeding and improvements in crop management systems. This rise in yield potential has been brought about not by increased production intensity, but by better use of natural resources and production factors. In Germany, legislation rules many environmental aspects of agricultural plant production, and special laws are in force concerning fertilizer use, soil protection, and pesticide use. In sugar beet, nitrogen fertilizer use has decreased greatly and may be reduced further in some regions. A further reduction of potassium and phosphorus fertilizer use does not seem to be appropriate. Conservation tillage contributes to soil protection and is already performed on > 100 000 ha of land growing sugar beet. Strategies of integrated production aim to reduce pesticide use to the bare minimum. Integrated pest management is effective to control insects, nematodes and leaf spot diseases. Pesticide use in sugar beet is dominated by herbicide application. The most promising strategy to reduce the amount of active ingredient seems to be the growing of genetically modified herbicide‐tolerant varieties. Possible directions for future research are discussed, and the prospects for sustainable development, in terms of economic, ecological and social factors, are considered.  相似文献   

6.
The Passiflora L. (Passifloraceae) genus consists of about 500 species widely distributed throughout tropical and subtropical regions, commonly known as the passion flower. The passion flowers are considered ornamental plants because of the exotic beauty of their flowers and variant foliage. Since their introduction to the Old World, around 1625, seventeenth century, they have been used to decorate European glasshouses and gardens. Interspecific hybridization is used to produce single ornamental plants. However in some countries, such as Brazil, being centre of origin of many species, the potential value of these species has hardly been exploited. The beauty of these wild species and their hybrids is little known in Brazil. Therefore it is here intended to highlight the productive and commercial potential of the passion flowers for the purpose to generate an income in family agriculture, while maintaining the ecological balance and optimizing the use of natural resources.  相似文献   

7.
The response of crop growth and yield to CO2 and ozone is known to depend on climatic conditions and is difficult to quantify due to the complexity of the processes involved. Two modified mechanistic crop simulation models (AFRCWHEAT2-O3 and LINTULCC), which differ in the levels of mechanistic detail, were used to simulate the effects of CO2 (ambient, ambient ×2) and ozone (ambient, ambient ×1.5) on growth and developmental processes of spring wheat in response to climatic conditions. Simulations were analysed using data from the ESPACE-wheat project in which spring wheat cv. Minaret was grown in open-top chambers at nine sites throughout Europe and for up to 3 years at each site.

Both models closely predicted phenological development and the average measured biomass at maturity. However, intermediate growth variables such as biomass and leaf area index (LAI) at anthesis, seasonal accumulated photosynthetically active radiation intercepted by the crop (ΣIPAR), the average seasonal light use efficiency (LUE) and the light saturated rate of flag leaf photosynthesis (Asat) were predicted differently and less accurately by the two models. The effect of CO2 on the final biomass was underestimated by AFRCWHEAT2-O3 due to its poor simulation of the effect of CO2 on tillering, and LAI.LINTULCC overestimated the response of biomass production to changes in CO2 level due to an overprediction of the effect of CO2 on LUE. The measured effect of ozone exposure on final biomass was predicted closely by the two models. The models also simulated the observed interactive effect of CO2 and ozone on biomass production. However, the effects of ozone on LAI, ΣIPAR and Asat were simulated differently by the models and less accurately with LINTULCC for the ozone effects on LAI and ΣIPAR. Predictions of the variation between sites and years of growth and development parameters and of their responses to CO2 and ozone were poor for both AFRCWHEAT2-O3 and LINTULCC. It was concluded that other factors than those considered in the models such as chamber design and soil properties may have affected the growth and development of cv. Minaret. An analysis of the relationships between growth parameters calculated from the simulations supported this conclusion. In order to apply models for global change impact assessment studies, the difficulties in simulating biomass production in response to CO2 need to be considered. We suggest that the simulation of leaf area dynamics deserves particular attention in this regard.  相似文献   


设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号