The world’s drylands are among the most vulnerable ecosystems on our planet. Desertification and land degradation are affecting huge land areas, jeopardizing the livelihoods of millions of people. Unsustainable management practices in dryland cultivation and pastoralism have given rise to widespread soil erosion, reduction of the biological production of soils, reduction of vegetation cover, and depletion of surface and groundwater resources.
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Showing items 1 through 9 of 49.-
Library ResourceJournal Articles & BooksDecember, 2008Global
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Library ResourceJournal Articles & BooksDecember, 2008Global
Change in land management practices and governmental policies is urgently needed to reverse the continuing decline of marginal drylands. Marginal drylands are fragile ecosystems that sustain the livelihoods of millions of poor people in developing countries. However, their capacity to provide these services is continuously declining due to desertification, resulting in dwindling land productivity, and affecting human well-being and development opportunities in many marginal drylands.
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Library Resource
Consequences for Tenure Security, Agricultural Productivity and Land Management Practices
Journal Articles & BooksJanuary, 2008TajikistanThis paper examines the impact of land reform on agricultural productivity in Tajikistan. Recent legislation allows farmers to obtain access to heritable land shares for private use, but reform has been geographically uneven. The break-up of state farms has occurred in some areas where agriculture has little to offer but, where high value crops are grown, land reform has hardly begun. In cases where collectivized farming persists and land has not been distributed, productivity remains low and individual households benefit little from farming.
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Library ResourceJournal Articles & BooksDecember, 2008Kenya
Pastoralists traditionally relied on herd mobility to cope with drought. In the pastoral areas of Kajiado,
Kenya this strategy is now threatened by increased individual land ownership as compared to
communal access. Drought frequency as related to El-Nino and Southern Oscillation (ENSO) is
predicated to increase with climate change. The aim of the study was investigate the use of herd
mobility strategy in the ENSO related 1999/2000 la Nina induced drought under different land tenure -
Library ResourceJournal Articles & BooksJanuary, 2009Chile
Se compararon dos manejos pratenses: pastoreo con vacunos y pastoreo con ovejas, en un suelo volcánico, del centro-sur de Chile, con los valores bioindicadores de Ellenberg establecidos para malezas europeas, que forman esas praderas. Se comprobó que el pastoreo con ovinos degrada el suelo y la cubierta vegetal mucho más que el pastoreo con bovinos, lo que se corresponde con las diferencias vegetacionales y edáficas establecidas por un estudio anterior mediante análisis edáficos y fitosociológicos.
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Library ResourceJournal Articles & BooksJanuary, 2008Mexico
El pastoreo del microzooplancton (< 200 m) sobre el fitoplancton, juega un papel importante en la trofodinámica del sistema pelágico. Para determinar la relevancia de este proceso en Bahía Concepción, se utilizaron la clorofila-a estimada por cromatografía líquida de alta resolución (HPLC) y la microscopía para determinar las tasas de crecimiento del fitoplancton y pastoreo por el microzooplancton obtenidas con la técnica de dilución. El crecimiento del fitoplancton y pastoreo por el microzooplancton fue evaluado en la región media de la bahía.
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Library ResourceJournal Articles & BooksJanuary, 2009Argentina
La cuenca del río Los Puestos, área considerada en este trabajo, se sitúa en el extremo norte del departamento de Ambato, Catamarca, Argentina. Sus límites están establecidos por las formaciones pampeanas Ambato-Manchao (4.050 m.s.n.m.) al oeste, y por la sierra Graciana-Balcozna (1.850 m.s.n.m.) al este. En tanto, su límite sur lo constituye el valle de Catamarca y, hacia el norte, los Altos de Singuil. En la llanura aluvial del fondo del valle, corre de norte a sur el río Los Puestos, que nace en los Altos de Singuil, a 1.250 m.s.n.m. En este escenario, a partir del siglo VI d.C.
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Library ResourceJournal Articles & BooksJanuary, 2009Argentina
En este escrito se expone una clasificación de 15 miniaturas zoomorfas inkas de metal y Spondylus, basada en formas y técnicas de manufactura desarrollando también una interpretación del significado de materiales, de asociaciones cardinales y de objetos del contexto funerario recuperado en 1999 de la cima del volcán Llullaillaco (6.739 msnm, Provincia de Salta, Argentina).
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Library ResourceJournal Articles & BooksDecember, 2008Zimbabwe, Africa, Southern Africa
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Library ResourceJournal Articles & BooksJune, 2008Kenya, Africa, Eastern Africa
A number of studies have begun to show the large impact that pastoralism has on African savanna ecosystems. Here we look at the impact of abandoned settlements on the distribution of the large ungulates of Amboseli, Kenya.
Monthly dung counts show that all 9 species studied are attracted by settlements for up to a century after abandonment.
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