ISSN:
1435-0661
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
-3 in modern beach sediments to 〉 73 kg m-3 in Typic Sapristels in high-centered, ice-wedge polygons developed in reworked organic-rich lake sediments. The SOC averaged 50 kg m-3 for the entire 64-km2 area (excluding open water). Considerable variability in SOC exists within individual soil map units. For example, SOC levels in a Typic Aquiturbel (formerly classified as a Meadow Tundra, Normal Phase soil) ranged from 24 to 109 kg m-3 (average = 48 ± 23 kg m-3). Substantial variation in SOC occurs within individual patterned-ground units. For a high-centered, ice-wedge polygon with a diameter of 15 m, SOC levels are 24, 32, and 64 kg m-3 for the wedge trough, rim, and center, respectively. In a low-centered, ice-wedge polygon, SOC levels are 28 and 83 kg m-3 for the trough and center. The variation in SOC within soil map units and individual patterned-ground units is due primarily to differences in the amount of ground ice. Active-layer thickness varies within and between soil map units, ranging from 31 cm in Typic Sapristels to 〉 100 cm in modern beach sediments. About 47% of the SOC in the upper meter of soil was in the active layer at the time of sampling; the remainder occurring in frozen ground, much of it meeting the definition of permafrost. Some of the SOC originates from past reworking of organic-rich lake sediments. Carbon stocks in near-surface permafrost may be of global significance and should be inventoried in other tundra regions.
Type of Medium:
Electronic Resource
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