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mrobles's desertification [5 articles]

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	Shrubland encroachment in southern New Mexico, U.S.A.: An analysis of desertification processes in the American southwest Climatic Change, Vol. 17, No. 2. (1 December 1990), pp. 305-330. by Herbert D. Grover, Brad H. Musick posted to climate-change desertification new-mexico shrub-encroachment by mrobles on 2008-09-04 00:40:50 Abstract Copy My Attachments My Copy Abstract The area dominated by the shrubs creosotebush (Larrea tridentata) and mesquite (Prosopis glandulosa) in the American southwest has increased several-fold over the last century, with a corresponding decrease in areal coverage of productive grasslands and increased surface soil erosion throughout the region. The factors thought to be responsible for this regional shift in vegetation are: (1) overgrazing by domestic livestock; (2) fire suppression; and (3) historical changes in climate. We examine the evidence concerning each of these factors and develop a ...
	Hydrology-vegetation interactions in areas of discontinuous flow on a semi-arid bajada, Southern New Mexico Journal of Arid Environments, Vol. 51, No. 3. (July 2002), pp. 319-338. by John Wainwright, Anthony J. Parsons, William H. Schlesinger, Athol D. Abrahams posted to chihuahuan-desert desertification by mrobles on 2008-07-22 22:47:57 Abstract Copy My Attachments My Copy Abstract Flows on a bajada surface in the Chihuahuan Desert of New Mexico show a discontinuous pattern, with alternating areas of channelization and deposition. Based on their planform appearance, we have termed the depositional areas [`]beads'. Instrumented catchments demonstrated that in comparison to [`]normal' dendritic catchments, the beads show net infiltration in all but the largest flow events. Net accumulation of the bead surface appears to occur in years of lower than average rainfall, but the surface is dynamic and suffers net ...
	Potential of Desertification Control to Sequester Carbon and Mitigate the Greenhouse Effect Climatic Change, Vol. 51, No. 1. (1 October 2001), pp. 35-72. by R. Lal posted to carbon-storage climate-change desertification land-use-change sequestration adaptation by mrobles on 2008-07-22 21:58:44 Abstract Copy My Attachments My Copy Abstract There is a strong link between desertification of the drylands and emission of CO2 from soil and vegetation to the atmosphere. Thus, there is a strong need to revisit the desertification process so that its reversal can lead to C sequestration and mitigation of the accelerated greenhouse effect. Drylands of the world occupy 6.31 billion ha (Bha) or 47% ofthe earth's land area distributed among four climates: hyper-arid (1.0 Bha), arid (1.62 Bha), semi-arid (2.37 Bha) and dry sub-humid (1.32 Bha). ...
	Desertification alters patterns of aboveground net primary production in Chihuahuan ecosystems Global Change Biology, Vol. 8, No. 3. (2002), pp. 247-264. by Laura F. Huenneke, John P. Anderson, Marta Remmenga, William H. Schlesinger posted to chihuahuan-ecosystems desertification land-use-change by mrobles on 2008-07-22 21:26:11 Abstract Copy My Attachments My Copy Abstract AbstractThe Chihuahuan desert of New Mexico, USA, has changed in historical times from semiarid grassland to desert shrublands dominated by Larrea tridentata and Prosopis glandulosa. Similar displacement of perennial grasslands by shrubs typifies desertification in many regions. Such structural vegetation change could alter average values of net primary productivity, as well as spatial and temporal patterns of production. We investigated patterns of aboveground plant biomass and net primary production in five ecosystem types of the Jornada Basin Long-Term Ecological Research (LTER) ...
	The stability of vegetation boundaries and the propagation of desertification in the American Southwest: A modelling approach Ecological Modelling, Vol. 208 (2007), 91-101. by E. N. Mueller, J. Wainwright, A. J. Parsons posted to climate-change desertification ecosystem-response future-projections by mrobles on 2008-07-21 21:43:43 Abstract Notes Copy My Attachments My Copy Abstract A process-based approach to spatially distributed, overland-flow modelling is employed to assess the impact of water and nutrient redistribution at the landscape scale caused by short, high-intensity rainstorm events across grasslandshrubland vegetation boundaries of a semi-arid ecosystem in the south-western United States. The modelling scenarios showed that simulated fluxes from shrubland into grassland lead to a gain of water resources but to a loss of nutrient resources in the grassland areas close to the boundary. Simulated fluxes from grasslands into shrublands ... Note (first note only) Record ID: 10874

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