By Michael Stocking (auth.), Arthur J. Conacher (eds.)
This publication includes chosen contributions from the 6th assembly of the overseas Geographical Union's fee on Land Degradation and Desertification, held in Perth, Australia, in September 1999. jointly, those contributions explicitly search to appreciate not just the mechanisms accountable for the matter of land degradation yet their social and fiscal implications, the technique of overcoming the issues, and the coverage tools wherein remedial measures could be applied. This breadth of strategy is either unique and crucial if the issues are to be tackled successfully. The authorship includes of experts (mostly geographers) from universities, learn corporations, and executive organisations, who supply a very foreign viewpoint with contributions from Iceland to Australia and from the united states to Japan.
Audience: The publication offers present study findings so that it will be of specific profit to execs and practitioners, in addition to researchers and tertiary-level educationalists who're concerned with land degradation.
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Extra info for Land Degradation: Papers selected from Contributions to the Sixth Meeting of the International Geographical Union’s Commission on Land Degradation and Desertification, Perth, Western Australia, 20–28 September 1999
Uk) CHAPTER 3 POTENTIALS AND PROBLEMS IN USING NEBKHA DUNES AS INDICATORS OF SOIL DEGRADATION IN THE MOLOPO BASIN, SOUTH AFRICA AND BOTSWANA A. J. DOUGILL and A. D. THOMAS 1. Abstract Nebkha dunes, formed from sediment accumulations around shrubs, have been proposed as a reliable, rapid indicator of dryland degradation. This paper aims to investigate the applicability of this link for the Molopo Basin, southern Africa, from sedimentological and biochemical evidence. This study shows that sediments are largely locally derived from interdune areas suggesting saltation and surface creep are the key aeolian transport processes leading to nebkha formation.
1999). Despite this, it is apparent from these preliminary fmdings that there is a significant nutrient enrichment in nebkha sediments compared with adjacent interdunes. This is especially true for nitrate (N03--N) and phosphate (PO/-P), the main inorganic forms of the two key limiting nutrients (N and P) in southern African rangelands (Skarpe and Bergstrom 1986; Scholes 1990). Increased nutrient concentrations in nebkha sediments were recorded for all grain size classes (Table 6). This suggests that selective redistribution through erosion and deposition is not the sole cause of the increased inorganic soil nutrient heterogeneity with some in situ nutrient accumulation occurring on nebkhas.
Kriging has been shown to be one ofthe most reliable two-dimensional spatial estimators (Laslett et al. 1987) and it might be expected to produce more reliable estimates of regional rainfall and therefore the location of the isohyets, than simple methods of interpolation. The anisotropic behaviour of the rainfall data was accounted for in the kriging estimation procedure by a linear transformation of the co-ordinates known as geometric or affine anisotropy (Journel and Huijbregts 1978). Using GSLIB (Deutsch and Journel1992), the parameters of the models fitted to the variograms were used to solve anisotropic ordinary punctual kriging equations and to estimate TSR residuals from the quadratic polynomial on a 1 degree (ca.
Land Degradation: Papers selected from Contributions to the Sixth Meeting of the International Geographical Union’s Commission on Land Degradation and Desertification, Perth, Western Australia, 20–28 September 1999 by Michael Stocking (auth.), Arthur J. Conacher (eds.)