BUFFERING CAPACITY OF FOREST LITTERS

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Дата изменения: Thu Nov 10 23:18:59 2005
Дата индексирования: Mon Oct 1 23:58:05 2012
Кодировка:
Поисковые слова: horizon

BUFFERING CAPACITY OF FOREST LITTERS TO ACID ATMOSPHERIC PRECIPITATION

G.N. Koptsik, E.D. Silaeva

Soil Science Faculty, Moscow State University, Moscow 119899, Russia

Eurasian Soil Science, 1996, 28 (10): 124-136.

Annotation:

The buffering of the organic horizons of forest soils (26-240 mmol/kg) exceeds mineral horizons' one by almost one order. The organic horizons consume 68-79% H⁺ entering in the course of continuous potentiometric titration through rapid cation exchange (29-42%), nonexchangeable protonation of soluble (24-55%) and insoluble (16-34%) organic substances. The additional H⁺-consuming process is slow reductive formation of Fe²⁺ and Mn²⁺. The organic horizons are an important barrier protecting mineral horizons against acidification. The modern acid load in industrial areas of the Kola Peninsula exceeds the buffer capacity of organic horizons and can lead to soil acidification and forest ecosystem function disturbance.

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