| 释义 |
pedocal Soil Sci.|ˈpɛdəʊkæl|
[f. pedo- + calcium.]
A soil that contains a layer of accumulated calcium carbonate (generally characteristic of dry climates). Cf. pedalfer.
1928C. F. Marbut in Proc. & Papers 1st Internat. Congr. Soil Sci. IV. 20 A formal definition of the two groups is as follows: I. Includes all soils in whose maturely developed profiles no higher percentage of lime carbonate is found than in the parent material beneath them and in which either a shifting or an accumulation of sesquioxide and in many cases both, has taken place. II. Includes all soils with fully developed profiles in which lime carbonate is found on some horizon in the solum in higher percentage than in the parent geological formation beneath... The name Pedalfers is suggested as a designation for the soils of group I, and Pedocals for those of group II. 1938Nature 21 May 925/2 It has been generally accepted that the climate of Great Britain is too wet for pedocals to develop. 1949F. J. Pettijohn Sedimentary Rocks xii. 384 The pedalfers and pedocals are subdivided into many soil types. 1968[see halomorphic adj. s.v. halo-]. 1972J. G. Cruickshank Soil Geogr. v. 158 Marbut..established a classification that became the most widely known of the schemes based on soil genesis, in which he made the two⁓fold primary sub-division between the leached soils (pedalfers) and the non-leached (pedocals) freely drained soils. 1977A. Hallam Planet Earth 179 These ideas were accepted in the USA, and the concepts of pedalfers and pedocals added: pedalfers are leached soils in humid areas where aluminium and iron accumulate in the B horizon, and pedocals occur in more arid regions.
Hence pedoˈcalic a.
1928Proc. & Papers 1st Internat. Congr. Soil Sci. IV. 23 Most of the groups of Pedalferic soils in category V were defined by Russian pedologists, but they made no attempt to differentiate the Pedocalic soils on the same basis since the Eurasian conditions do not present an opportunity for doing it. 1938Nature 21 May 925/1 (heading) Pedocalic tendencies in soils of southern England. 1941H. Jenny Factors Soil Formation vi. 191 Not all soils that are embraced by the area labeled as pedocals contain lime horizons. Only those soils which have the required normal topography and which have attained sufficient maturity deserve the attribute pedocalic. |