Your search found 12 records
(Location: IWMI-HQ Call no: PER Record No: H02997)
2 Wassmann, R.; Vlek, P. L. G.. (Eds.) 2004. Tropical agriculture in transition: Opportunities for mitigating greenhouse gas emissions? Dordrecht, Netherlands: Kluwer. 277p.
(Location: IWMI-HQ Call no: 630 G000 WASS Record No: H033889)
3 Martius, C.; Lamers, J.; Wehrheim, P.; Schoeller-Schletter, A.; Eshchanov, R.; Tupitsa, A.; Khamzina, A.; Akramkhanov, A.; Vlek, P. L. G.. 2004. Developing sustainable land and water management for the Aral Sea Basin through an interdisciplinary approach. In Seng, V.; Craswell, E.; Fukai, S.; Fischer, K. (Eds.), Water in agriculture: Proceedings of a CARDI International Conference “Research on Water in Agricultural Production in Asia for the 21st Century” Phnom Penh, Cambodia, 25-28 November 2003. Canberra, Australia: ACIAR. pp.45-60.
(Location: IWMI-HQ Call no: 631.7.2 G000 SEN Record No: H034946)
(Location: IWMI-HQ Call no: P 7009 Record No: H035431)
5 Ibrakhimov, M.; Park, S.; Vlek, P. L. G.. 2004. Development of groundwater salinity in a region of the Lower Amu-Darya River, Khorezm, Uzbekistan. Ryan, J.; Vlek, P.; Paroda, R. (Eds.), Agriculture in Central Asia: Research for development. Aleppo, Syria: ICARDA. pp.56-75.
(Location: IWMI-HQ Call no: 630 G570 RYA Record No: H036009)
6 Grote, U.; Craswell, E. T.; Vlek P. L. G.. 2008. Nutrient and virtual water flows in traded agricultural commodities. In Braimoh, A. K.; Vlek, P. L. G. (Eds.). Land use and soil resources. Dordrecht, Netherlands: Springer. pp.121-143.
(Location: IWMI HQ Record No: H041023)
Globalization and increasing population pressure on food demand and land and water resources have stimulated interest in nutrient and virtual water flows at the international level. West Asia/North Africa (WANA), Southeast Asia, and sub-Saharan Africa are net importers not only of nitrogen, phosphorus, and potassium (NPK) but also of virtual water in agricultural commodities. Nevertheless, the widely recognized declines in soil fertility and problems related to water shortage continue to increase, especially in sub-Saharan Africa. The nutrients imported are commonly concentrated in the cities, creating waste disposal problems rather than alleviating deficiencies in rural soils. And also the water shortage problems continue to contribute to intensified desertification processes, which again lead to increased urbanization and thus water shortage problems in cities. Countries with a net loss of NPK and virtual water in agricultural commodities are the major food exporting countries—the USA, Australia, and some Latin American countries. Understanding the manifold factors determining the nutrient and water flows is essential. Only then can solutions be found which ensure a sustainable use of nutrients and water resources. The chapter ends by stressing the need for factoring environmental costs into the debate on nutrient and water management, and advocates more transdisciplinary research on these important problems.
7 Katyal, J. C.; Vlek, P. L. G.. 2000. Desertification: concept, causes and amelioration. Bonn, Germany: Center for Development Research. 65p. (ZEF Discussion Papers on Development Policy 33)
(Location: IWMI HQ Call no: e-copy only Record No: H041341)
8 Mitra, S.; Wassmann, R.; Vlek, P. L. G.. 2003. Global inventory of wetlands and their role in the carbon cycle. Bonn, Germany: Center for Development Research. 44p. (ZEF-Discussion Papers on Development Policy 64)
(Location: IWMI HQ Call no: e-copy only Record No: H041352)
(Location: IWMI HQ Call no: 333.73 G000 BRA Record No: H043457)
(0.37 MB)
10 Tischbein, B.; Manschadi, A. M.; Conrad, C.; Hornidge, A.-K.; Bhaduri, A.; Ul Hassan, M.; Lamers, J. P. A.; Awan, Usman Khalid; Vlek, P. L. G.. 2013. Adapting to water scarcity: constraints and opportunities for improving irrigation management in Khorezm, Uzbekistan. Water Science and Technology: Water Supply, 13(2):337-348. [doi: https://doi.org/10.2166/ws.2013.028]
(Location: IWMI HQ Call no: e-copy only Record No: H045861)
(0.36 MB)
Like many irrigation schemes in Central Asia, the one in Khorezm faces a two-fold challenge: on the one side, the severe problems inherited from the past need to be remedied and on the other side, the rising supply–demand gap driven by sharpening competition for water and climate change must be dealt with. Located in the lower part of the Amu Darya basin, Khorezm irrigation and drainage scheme is particularly vulnerable to supply–demand gaps. Promising solutions towards adaptation comprise modified strategies of land and water use towards higher efficiency and flexibility in combination with measures to lessen the constraints of the system itself, which was initially designed for the management of a few, large and uniform production units and not for many diverse and small units. Solutions consist of flexible, modeling-based approaches, re-arranging institutional settings and establishing economic incentive systems. Flexible modeling allows an integrated use of surface and groundwater resources avoiding or minimizing the impact of water stress on yield. Institutional settings strengthen the position of water users via improved participation and transparency of processes in Water Consumers Associations (WCAs). Economic measures support sustainable resource use strategies and improve the functioning of WCAs. The findings could be extrapolated to other regions of Central Asia with similar conditions and challenges.
11 Vlek, P. L. G.; Khamzina, A.; Azadi, H.; Bhaduri, A.; Bharati, Luna; Braimoh, A.; Martius, C.; Sunderland, T.; Taheri, F. 2017. Trade-offs in multi-purpose land use under land degradation. Sustainability, 9(12):1-19. [doi: https://doi.org/10.3390/su9122196]
(Location: IWMI HQ Call no: e-copy only Record No: H048411)
(13.9 MB)
Land provides a host of ecosystem services, of which the provisioning services are often considered paramount. As the demand for agricultural products multiplies, other ecosystem services are being degraded or lost entirely. Finding a sustainable trade-off between food production and one or more of other ecosystem services, given the variety of stakeholders, is a matter of optimizing land use in a dynamic and complex socio-ecological system. Land degradation reduces our options to meet both food demands and environmental needs. In order to illustrate this trade-off dilemma, four representative services, carbon sinks, water storage, biodiversity, and space for urbanization, are discussed here based on a review of contemporary literature that cuts across the domain of ecosystem services that are provided by land. Agricultural research will have to expand its focus from the field to the landscape level and in the process examine the cost of production that internalizes environmental costs. In some situations, the public cost of agriculture in marginal environments outweighs the private gains, even with the best technologies in place. Land use and city planners will increasingly have to address the cost of occupying productive agricultural land or the conversion of natural habitats. Landscape designs and urban planning should aim for the preservation of agricultural land and the integrated management of land resources by closing water and nutrient cycles, and by restoring biodiversity.
(Location: IWMI HQ Call no: e-copy only Record No: H049917)
(7.33 MB) (7.33 MB)
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