Farming methods are generally the cause for degradation. Excessive tillage and removal of vegetation often encourage soil erosion by exposing the soil to rain and wind. Overgrazing by cattle and the build-up of salt on irrigated land are major contributors, as well. Degradation has historically been considered a problem of tropical, developing nations. Sub-Saharan Africa is still most severely affected. The region contains 13 percent of global degraded area, while nations such as Swaziland are almost entirely located on degraded soil.
The degradation that has occurred over the past 23 years, however, mostly affects new areas. According to the report, nations such as China, Argentina, and South Africa are now facing greater problems than before.
More assessment of land degradation has become crucial, the authors noted. The study follows the International Assessment of Agricultural Science and Technology for Development's April report that called for a worldwide "paradigm shift" towards more sustainable agriculture. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required.
Would you like to tell us about a lower price? If you are a seller for this product, would you like to suggest updates through seller support? Soil Degradation in the United States: Extent, Severity, and Trends examines the magnitude and severity of soil degradation by different processes in the U.
In addition, it addresses policy issues with regard to economic and environmental impact, land use change, and global trends. It covers past trends and future projections regarding soil degradation. The book provides a ready reference and data source for soil scientists and researchers, agronomists, environmentalists, land use planners, land managers, and policy makers.
Read more Read less. Save Extra with 4 offers. There are three differences with LNS. Nevertheless, Reeves and Baggett's results have some broad similarities to LNS, for example, in the areas of eastern New Mexico and Colorado and northwestern Texas. There were, however, large differences in the degree of degradation, even in some known areas of degradation.
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For example, the NRI map of biotic integrity shows intense degradation in areas where LNS has only moderate departure from the reference condition, such as in the region at the intersection of state lines of Utah, Colorado, New Mexico, and Arizona four corners , and also western Texas and Oklahoma. Changes in species composition may reduce the rangeland health through reduction in biotic integrity and palatability, but, at the same time, may increase the NPP Knapp et al.
For example, several studies Asner et al. Aside from these legitimate differences, the NRI maps are an interpolation between data from field samples sections that were between 16 and ha, giving a spatial sampling rate of between 0. With growing population and increased human consumption of primary production Rojstaczer et al.
The elaborated methodology and the reduction assessments reported here will not only help local sustainable management, but also influence policies intended to enhance U. Currently, policies for carbon sequestration often use the findings of potential primary production models. However, such models do not take into account human modifications of land and its processes. The differences between potential and actual production can be very large, to the extent that potential models can be irrelevant.
This study provides an assessment of dryland degradation and estimates of reductions of productivity in the southwestern United States study area. It also identifies areas where remediation efforts would have the greatest effects on regional C sequestration if applied to areas with higher productive potential and vice versa. The total NPP reductions were The reductions were large and mostly consistent between years in spite of large variations in overall NPP caused by interannual differences in rainfall and other aspects of weather. The results indicate the overall difference between potential and actual NPP in the southwestern United States was Volume 1 , Issue 8.
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Research Article Open Access. Stephen D. Tools Export citation Add to favorites Track citation. Share Give access Share full text access. Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article. Abstract Dryland degradation has long been recognized at regional, national, and global scales, yet there are no objective assessments of its location and severity. Figure 1 Open in figure viewer PowerPoint. Soils Eight interpretive soil capability classes from the U. Riparian vegetation Riparian land, although small compared to the typical LCC, is usually very different from the neighboring land.
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Status and Trends in Land Degradation in Africa | SpringerLink
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Conclusions With growing population and increased human consumption of primary production Rojstaczer et al. Literature Cited.
Anderegg, W. Kane, and L. Consequences of widespread tree mortality triggered by drought and temperature stress.
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