Abstract
Diurnal temperature courses were measured with thermistores at different depths of Diapensia lapponica cushions in Swedish Lapland. With summerly radiation conditions the peripheral cushion layers warm up considerably more than the air, which causes a steep temperature gradient toward the centre; at night the cushions cool off more than the air; a gentle gradient from the centre towards the periphery may persist over an extended period of time. The diurnal temperature amplitude in the cushions close to the surface may exceed that in the soil considerably. Whereas the temperatures in the peripheral cushion layers vary immediately with intake and loss of energy through radiation and wind, the interior of the cushion is less responsive thermally.
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