Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p13b1400a&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P13B-1400
Mathematics
Logic
[0439] Biogeosciences / Ecosystems, Structure And Dynamics
Scientific paper
On Devon Island, Nunavut, Canada, the Haughton Impact Crater was created when an extra-terrestrial object hit the Earth ~39M years ago. It is evident that areas within the crater have a greater density of vegetation than is normally found in the polar desert that surrounds the crater. In some cases (e.g. alluvial and palaeolacustrine sediments) there is a potential causative link between vegetation cover and substrate. However, in other areas within the crater, the potential causes are less evident. Past researchers have suggested that the principal reason for the overall increase in vegetation density within the crater is the hydrologic depression created by the impact and processes after the impact. As part of an investigation into links between vegetation structure and impact-related soil changes, a series of transects were randomly selected within the Haughton Impact Crater and in areas immediately adjacent to the crater site. One of these transects continuously spanned areas with soil derived from impact breccia, palaeolacustrine sediments, alluvial sediments, crater rim, and adjacent polar desert (both crater rim and polar desert soils are derived from Silurian sediments). The polar desert had very low plant cover and species density, whereas alluvial and palaeolacustrine-derived soils bore species rich and relatively high plant covers. Breccia-derived soils supported an intermediate level of vegetation cover. The Haughton Impact Structure, because of its relatively uneroded state and lack of significant soil development, offers opportunities for the study of the effect of impacts on the ability of substrates to support terrestrial plant life.
Artman L.
Johnson-Green P.
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