total sample set <5 -10 -20 (mg TOC/g fine earth) Lithic Cryorthents 203 19 4 33 36 Lithic and Pergelic Haplocryods 99 22 7 17 29 Lithic and Pergelic Cryaquepts 42 9 28 42 19 Soil unit(A) Percentage of total sample set -30 -50 -100 -150 (mg TOC/g fine earth) Lithic Cryorthents 13 8 4 1 Lithic and Pergelic Haplocryods 26 15 5 0 Lithic and Pergelic Cryaquepts 7 2 2 0
The accumulation of organic matter in the topsoil induces the formation of A-C soils: Lithic or Pergelic Cryorthents (Blume et al.
This is why all Pergelic Cryaquepts are Aquaturbels (Tables 6 and 8).
According to the recent Keys to Soil Taxonomy (Soil Survey Staff 1996), only Lithic and Pergelic soil units can be distinguished.
Site B was characterised by a huge solifluction tongue from loamy fine material with loamy, Pergelic Cryaquepts showing scattered vegetation (Table 10) due to an active cryoturbation (Washburn 1980).
Soil unit(A) Vegetation(B) Sandy-skeletal, Lithic Haplocryod(c) Mosses and lichens--100% Loamy-skeletal, Pergelic Haplocryod Nil Loamy-skeletal, Lithic and Pergelic Cryaquept Scattered mosses, lichens, algae Fine-loamy, Lithic Cryaquept Mosses--100% Sandy-skeletal, Lithic Cryorthent Mosses and lichens--100% Loamy-skeletal, Lithic Cryorthent: With initial Podzol features Mosses and lichens--100% With no initial Podzol features Mosses and lichens--030%
However, the loamy Pergelic Haplocryods on relic penguin rookeries showed no vegetation at all, because of the thick gravel pavement, which requires a very long time to be colonised by plants (Smith 1990).
In a Pergelic Cryohemist (Terri-Gelic Histosol) from mosses, the depth distribution of C forms suggested a decomposition of carbohydrates and the enrichment of alkyl C in the deeper horizons (Fig.