Atmospheric input of dust and nitrogen into the Nizzana sand dune ecosystem, north-western Negev, Israel

Littmann, Thomas

doi:10.1006/jare.1996.0235

Cited by 52 publications

(25 citation statements)

References 20 publications

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“…Therefore, the relationship of decreasing silica content with decreasing particle size supports the use of values less than 10% as reasonable estimates of silica content in respirable dust or inhaled material below 10 microns in diameter. 49 USAEHA studies, which were representative of sand particulates in the Gulf War Theater, confirmed a similar composition to other desert areas reviewed in the scientific literature. Bulk samples contained an average of 4.3% and a maximum of 6.5% alpha-quartz in the silicon-rich portion of respirable particulate matter (less than 10 microns).…”

Section: B Air Monitoring Programs and Resultssupporting

confidence: 71%

Particulate Exposure During the Persian Gulf War

Thomas¹,

Vigerstad²,

Meagher³

et al. 2000

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Section: B Air Monitoring Programs and Resultssupporting

confidence: 71%

Particulate Exposure During the Persian Gulf War

Thomas¹,

Vigerstad²,

Meagher³

et al. 2000

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“…The presence of the crust was already evident during the end of the first growing season after scalping and within four to seven years scalped plots already attained the same biomass as the adjacent control plots (Kidron, 1995;Kidron et al, 1995). Contrary to Littmann's (1997) assumption, once present, the filamentous cyanobacteria which make up most of the crust micro-organisms will mechanically and chemically bind the uppermost surface, gluing sand and fine grains together by means of polysaccharide sheaths and slime excretion (Fletcher and Martin, 1948;Pluis and de Winder, 1989;Belnap, 1992;Kidron, 1995;Verrecchia et al, 1995;Mazor et al, 1996;Kidron et al, 1999). Both mechanisms will serve to impede grain translocation and leaching.…”

Section: Discussionmentioning

confidence: 84%

Runoff‐induced sediment yield over dune slopes in the Negev Desert. 2: Texture, carbonate and organic matter

Kidron

2001

Earth Surf Processes Landf

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Runoff-induced sediments were collected in the Hallamish dune field for four years (1990)(1991)(1992)(1993)(1994). Runoff and consequently water-transported sediments were generated on the dunes owing to the presence of a thin microbiotic crust. These sediments were analysed for their particle-size distribution and carbonate content. In addition, the organic matter content was calculated by measuring the chlorophyll content within the runoff. The results were compared to the slope parent material, i.e. the crust and the underlying sand, as well as to playa sediments, which are scattered within the Hallamish interdunal areas, and which were previously hypothesized to originate from runoff-induced sediments.Higher amounts of fines (silt and clay) and carbonate characterize the footslopes in comparison to the midslopes. Intermediate contents of fines (17 per cent) and carbonate (8 per cent) characterized the sediments in comparison to the fines (27 per cent) and carbonate (15 per cent) of the crust and to the fines (4 per cent) and carbonate (4 per cent) of the underlying sand. The runoff-induced fines and carbonate contents were significantly different from those of the playas, suggesting that the playa flats do not originate from runoff-induced sediments.The sediments were enriched with organic matter. Organic matter which originates from the crust amounted to 0Á3-0Á4 per cent as compared to 0Á1 per cent in the bare sand. Nevertheless, the crust was found to be relatively resilient to water flow. Only 0Á1-0Á5 per cent of the crust was annually eroded off the slope by water, with south-facing crusts showing higher resilience than north-facing crusts. The data may thus assist in the evaluation of the crust's residence time.

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“…The mobile crests of the Nizzana dunes are greatly influenced by exposure to wind due to an almost total lack of vegetation as well as the fact that they have no microbial crust. Mean multi-annual precipitation is 95 mm, with an interannual variability of up to 300 % (Littmann, 1997) and potential evaporation reaching 2600 mm (Evenari & Shuval, 1981;Kidron, 2001;Kidron & Yair, 2001). Organic matter is severely limited in sandy soil.…”

Section: Study Sitementioning

confidence: 99%

Effect of sand-dune slope orientation on soil free-living nematode abundance and diversity

Pen-Mouratov

Hu²,

Hindin

et al. 2010

Helminthologia

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179 SummaryThe spatial and temporal dynamics and composition of a soil free-living nematode community were studied in order to determine the impact of slope orientation on the community on the xeric south-and the mesic north-facing sand-dune slopes. A significant effect of sampling location on organic matter, total number of free-living nematodes, and trophic diversity was found. Although soil moisture had a significant effect on separate nematode trophic groups and on most of the applied ecological indices, no differences in soil moisture were observed between slopes. Organic matter was found to have a significant effect on the fungivore nematodes. The obtained results indicate that the south-facing slope is more favorable for the observed free-living nematodes than the other sampling sites. Twenty-four of the 77 nematode species that were found in the observed area showed dependence on dune slope orientation. The fungibacteria ratio, Simpson's dominance index, and basal index were useful tools for determining slope differences.

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Atmospheric input of dust and nitrogen into the Nizzana sand dune ecosystem, north-western Negev, Israel

Cited by 52 publications

References 20 publications

Particulate Exposure During the Persian Gulf War

Particulate Exposure During the Persian Gulf War

Runoff‐induced sediment yield over dune slopes in the Negev Desert. 2: Texture, carbonate and organic matter

Effect of sand-dune slope orientation on soil free-living nematode abundance and diversity

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