Energy and trace-gas fluxes across a soil pH boundary in the Arctic

Article Abstract:

There is a consistent spatial and temporal pattern of a much greater carbon sink in moist acidic tundra (MAT) than in moist non-acidic tundra (MNT), according to research into the ecosystem properties on either side of a prominent pH boundary within the Kuparuk River basin in Alaska. The wetter, more anaerobic soils of MAT were shown to efflux more than six times the methane of MNT. It is likely that, over century to millennium time scales, zonal soil pH boundaries will move northwards as a result of climate warming, reduction of loess sources and deeper winter snowpacks.

Hydrogen-ion concentration

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CO2 fluctuation at high altitudes

Article Abstract:

Previous studies have shown that increased land temperature stimulates a significant rise in atmospheric CO2 concentration at high latitudes. It has been suggested that longer growing seasons account for the increased seasonal amplitude of atmospheric CO2. Experimental warming conducted in the Alaskan arctic tundra supports such an assertion and suggests that increased microbial respiration in the winter season could also account for the fluctuations in atmospheric CO2.

Seasons

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A large and abrupt fall in atmosphere CO(sub2) concentration during Cretaceous times

Article Abstract:

The results of a compound-specific carbon-isotope study of Cenomanian/Turonian (C/T) sediments from the southern part of the North Atlantic Ocean, are presented. The abruptness and magnitude of the atmospheric CO(sub2) concentration change is quantified. The data indicates that plants utilizing the C(sub3)-type photosynthetic pathway were succeeded by plants using the C(sub4)-type pathway.

Geology, Stratigraphic, Stratigraphy, Cretaceous period

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