首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   20篇
  免费   1篇
  国内免费   1篇
测绘学   1篇
大气科学   3篇
地球物理   1篇
地质学   7篇
综合类   1篇
自然地理   9篇
  2021年   1篇
  2013年   3篇
  2012年   2篇
  2011年   1篇
  2010年   3篇
  2009年   1篇
  2008年   2篇
  2007年   1篇
  2006年   1篇
  2005年   1篇
  2003年   1篇
  2001年   1篇
  2000年   2篇
  1999年   1篇
  1997年   1篇
排序方式: 共有22条查询结果,搜索用时 15 毫秒
1.
This study examines the hypothesis that poor households engage in less sustainable soil management practices than rich households in a similar socioeconomic environment. This broad objective is explored in Mali's southern cotton belt through three specific research questions. First, is there empirical evidence to support the claim that poor households engage in less sustainable soil management practices than rich households? Second, what local and extra-local factors influence household agricultural management approaches in southern Mali? Third, what broader scale political and economic processes are linked to the factors that influence local-level agricultural management approaches? The author reports that soil quality measures on the farms of rich and poor households are not significantly different, refuting the conventional wisdom that the wealthy are better managers of the environment. A variety of environmentally deleterious practices are associated with export-oriented cotton production, an activity more vigorously pursued by wealthy than poor farmers. Finally, the focus on poverty in international environment and development discourse has allowed the government of Mali to avoid a serious debate on the sustainability of cotton production. The study's findings are based on household interviews describing agricultural management practices, an analysis of farm field soil measures, and discussions with donors and national policymakers.  相似文献   
2.
近几十年,全球汇款流在稳步增长并越来越成为发展中国家财政发展的重要源泉。汇款成为家庭收入中稳定的一部分,并组成了发展中国家第二大资金流——处于外国直接投资(FDI)之后,海外开发援助(ODA)之前。在撒哈拉以南非洲地区,流动工人的汇款成为财政发展以及救助穷人的财政服务的重要主题。本论文分析撒哈拉以南非洲地区迁移人口的汇款及其作用,并以马里作为重点研究对象。研究结论是,汇款在国家收入中占有重要比例,并将继续对个人家庭和社区提供重要支持,应该鼓励当地引导汇款促进基础设施发展和收入产生。  相似文献   
3.
There is a civilization at risk. In the middle of West Africa, just south of the Sahara, where the Niger River spills into a vast floodplain (the Middle Niger), an indigenous urban civilization emerged around two thousand years ago. The story of that civilization is just beginning to be uncovered from the thousands of tells (ancient settlement mounds) that litter the Middle Niger, but archaeologists have until recently been loosing the race with the looters who plunder these sites for ancient statues and bronze art. The nation of Mali, and the local community of Jenne at the epicenter of this looting recently invented effective shields for the remains of this civilization, protections against local looters in the employ of a syndicate of wealthy European antiquities dealers. In the person of the new, democratically-elected archaeologist-President, the nation has articulated a vision of Mali’s future linked to the preservation of its past. The government has promulgated effective regulations and education programs, and initiated with the United States the world’s first bilateral import ban between a major “source” and a major “market” nation. This 1993 bilateral accord has become a prototype for many nations. In that same year, Mali established a Cultural Mission at Jenne to reinforce local pride in a local past. This local pride, in only a short period, has turned into a total protection of some 200 sites within a ten-kilometer radius of Jenne. These indigenous actions have, in less than a decade, transformed the nonrenewable archaeological resources of the Jenne region from surely one of the world’s most endangered, to a case study in local and national protection  相似文献   
4.

On-going tenure changes in the cotton zone in southern Mali are discussed. Land tenure in the area is changing and adapting to the rapid agricultural development taking place. This adaptation supports the main tenets of Property Rights Theory (PRT). The driving forces behind enclosure of land rights as described by PRT, such as population pressure and increased market access, are acknowledged. Enclosure takes two forms in the study area. First, some customary authorities in villages where population pressure is relatively high attempt to restrict access to pastures and woods on village land to create exclusive village commons. Second, holdings are being subdivided and farmers are increasingly confining their fields through tree planting. Except around the towns, where semi-formal land sales are becoming increasingly frequent, this individualisation does not imply exclusive and absolute private property to land. Bundles of overlapping rights still exist where various individuals or groups control access to different resources on the same piece of land.  相似文献   
5.
The aim of this article is to analyse the influence of commodified cotton production on soil fertility in southern Mali. From the late 1950s and until recently, production of both cash-crop cotton and food crops have increased rapidly in this region, giving it a reputation of being an African ‘success story’. The flip side of this economic success is, however, said to be environmental degradation especially in terms of loss of soil fertility. We collected 273 soil samples in 19 villages located in various zones of land use intensity. In each village, the samples were collected on up to six different land use types varying with intensification. The analysis of the soil samples showed that soil fertility was highest in the sacred groves that have been protected and never cultivated. However, comparing soils under continuous cultivation and soils under fallow no clear trends in soil fertility were found. Cotton yields have declined since the early 1990s, while the total use of fertilisers has increased. This is often interpreted as proof of soil exhaustion, but there is no clear indication in this study that cotton-cereal rotation as practiced by smallholders in southern Mali reduces soil fertility. We argue that the decline in yields has been caused by an extensification process. Cotton fields expanded rapidly, due to attractive cotton prices in the 1990s, leading to falling investments per ha and cultivation of more marginal lands. These findings also have implications for a political ecology of commodity production and lead us to argue for an open-ended and empirically based ‘critical political ecology’.  相似文献   
6.
This paper examines the extent to which certified fairtrade cotton programs in West Africa present an alternative to the conventional cotton economy. Two fairtrade programs operating in Burkina Faso and Mali serve as case studies. The paper argues that fairtrade cotton fails to offer an alternative to conventional cotton because it works within the same commodity chain that impoverishes farmers in the first place. Cotton grower organizations seek more power within the conventional cotton sector to increase incomes and improve the living standards of all cotton growers. They are also active at the international level to eliminate the inequities of international trade. It is in these arenas that cotton growers are struggling to improve their incomes and livelihoods. Fairtrade does not address these fundamental inequities and power relations. The slim pickings of these programs are further evident in the very small amount of cotton produced and marketed as fair trade. Plans to expand production from less than 1% to 10% by 2012 are unrealistic in light of the introduction of genetically modified cotton and the limited market demand for fairtrade cotton. Despite these limitations, fairtrade cotton programs are producing some positive effects, notably women’s participation in cash crop cultivation, higher cotton quality, and the diffusion of organic farming techniques. An innovative direct marketing agreement linking the National Cotton Growers’ Union of Burkina Faso with the US women’s apparel company Victoria’s Secret indicates that alternative trading relations can be constructed outside the conventional commodity chain.  相似文献   
7.
The problem of soil degradation through alkalinization/salinization in an irrigated area with a semi-arid climate was examined in the inner delta of the Niger River, Mali, by the study of groundwater hydraulics and hydrochemistry in an area recharged by irrigation water. On the basis of data analysis on various scales, it is concluded that the current extent of the surface saline soils is due to a combination of three factors: (1) the existence of ancient saline soils (solonchaks) resulting from the creation of a broad sabkha west of the former course of the Niger River, now called the Fala of Molodo. These saline crusts were gradually deposited during the eastward tilting of the tectonic block that supports the Niger River; (2) the irrigation processes during the recent reflooding of the Fala of Molodo (river diversion in 1950). These used very poorly mineralized surface water but reintroduced into the alluvial groundwater system – generally of a low permeability (K=10–6?m?s–1) – salts derived from the ancient solonchaks; and (3) the redeposition of the dissolved salts on the surface due to the intense evapotranspiration linked to the present Sahelian climate. In this context, only efficient artificial draining of subsurface alluvial groundwater can eliminate most of the highly mineralized flow and thus reduce the current saline deposits.  相似文献   
8.
Abstract

The Least Developed Countries (LDCs) are a group of 49 of the world's poorest countries. They have contributed least to the emission of greenhouse gases (GHGs) but they are most vulnerable to the effects of climate change. This is due to their location in some of the most vulnerable regions of the world and their low capacities to adapt to these changes. Adaptation to climate change has become an important policy priority in the international negotiations on climate change in recent years. However, it has yet to become a major policy issue within developing countries, especially the LDCs. This article focuses on two LDCs, namely Bangladesh and Mali, where progress has been made regarding identifying potential adaptation options. For example, Bangladesh already has effective disaster response systems, and strategies to deal with reduced freshwater availability, and Mali has a well-developed programme for providing agro-hydro-meteorological assistance to communities in times of drought. However, much remains to be done in terms of mainstreaming adaptation to climate change within the national policymaking processes of these countries. Policymakers need targeting and, to facilitate this, scientific research must be translated into appropriate language and timescales.  相似文献   
9.
Abstract

The Mali agricultural sector and the country's food security are potentially vulnerable to climate change. Policies may be able to mitigate some of the climate change vulnerability. This article investigates several policy changes that may reduce vulnerability, including climate-specific and other policies. The policy set includes migration of cropping patterns, development of high-temperature-resistant cultivars, reduction in soil productivity loss, cropland expansion, adoption of improved cultivars, and changes in trade patterns. When all policies are considered together, results under climate change show an annual gain of $252 million in economic benefits as opposed to a $161 million loss without policy adjustment. Simultaneously, undernourishment is reduced to 17% of the Malian population as compared with 64% without policy adjustment. We also find tradeoffs in cases between economic benefits and undernourishment. Policies are also studied individually and collectively. Overall, the results indicate that policy can play an important role in reducing climate change vulnerability in Mali.  相似文献   
10.
ABSTRACT. Environmental narratives in Africa have been examined in a flurry of publications since the mid‐1990s. In this article we seek to offer insights into the role and motivations of volunteer development workers in perpetuating environmental narratives. We examine the factors that led to the questioning or nonquestioning of environment‐development discourses and their influence, if any, on the actual work undertaken by volunteers. As former development volunteers, we also explore the role that the development‐volunteer experience subsequently played in shaping our own research as academics. Our analysis is based largely on our tenure as U.S. Peace Corps volunteers in Mali from 1987 until 1989 and our later experiences as academics. We draw on our memories, interviews with former colleagues, and training materials to describe how volunteers were introduced to, and encouraged to act on, environmental problems in the West African Sudano‐Sahel. We adopt a reflexive approach to explore briefly how our experiences as volunteers influenced our research and writing as academics.  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