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In environments containing permafrost, the active layer is the top layer of soil that thaws during the summer and freezes again during the autumn. In all climates, whether they contain permafrost or not, the temperature in the lower levels of the soil will remain more stable than that at the surface, where the influence of the ambient temperature is greatest. This means that, over many years, the influence of cooling in winter and heating in summer (in temperate climates) will decrease as depth increases. If the winter temperature is below the freezing point of water, a frost front will form in the soil. This "frost front" is the boundary between frozen and unfrozen soil, and with the coming of spring and summer, the soil is thawed, ''always from the top down''. If the heating during summer exceeds the cooling during winter, the soil will be completely thawed during the summer and there will be no permafrost. This occurs when the mean annual temperature is above 0°C (32°F), but also occurs when the mean annual temperature is slightly below 0°C on sites exposed to the sun with coarse-textured parent materials (vegetation). When there is not sufficient heat to thaw the frozen soil completely, permafrost forms. The active layer in this environment consists of the top layers of soil which thaws during the summer, while the inactive layer refers to the soil below which is frozen year-round because the heat fails to penetrate. Liquid water cannot flow below the active layer, with the result that permafrost environments tend to be very poorly drained and boggy. ==Thaw depth in permafrost areas== The thickness of the active layer is the average annual thaw depth in permafrost areas, due to solar heating of the surface. Thus, the primary determinant of active layer thickness is the maximum temperature attained during the summer. If it is only a little above 0°C, the active layer can be very thin (only 10 cm on Ellesmere Island), whilst if it is quite warm, it is much thicker (about 2.5 m at Yakutsk), and if the permafrost is discontinuous and soil begins thawing earlier, it can be still thicker (5 meters at Yellowknife). The parent material of the soil is also important: active layers in soils made of sandy or gravelly parent materials can be up to five times deeper than those made from loam- or clay-rich parent material. This is because the coarser material allows for much greater conductivity of heat down into the soil. This is important because roots of plants cannot penetrate beyond the active layer and are restricted by its thickness. Thus, in a continuous permafrost environment plants must have shallow roots, which restricts tree growth to specialised species such as ''Larix''. In areas of discontinuous permafrost, most conifers are able to grow easily. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「active layer」の詳細全文を読む スポンサード リンク
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