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THE ACCUMULATION OF SOIL ORGANIC MATTER AND ITS CARBON ISOTOPE CONTENT IN A CHRONOSEQUENCE OF SOILS DEVELOPED ON AEOLIAN SAND IN NEW ZEALAND
Author(s) -
GOH K. M.,
RAFTER T. A.,
STOUT J. D.,
WALKER T. W.
Publication year - 1976
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1976.tb01979.x
Subject(s) - humin , humic acid , chemistry , soil water , chronosequence , total organic carbon , fulvic acid , organic matter , environmental chemistry , decomposition , carbon fibers , soil science , geology , organic chemistry , fertilizer , materials science , composite number , composite material
Summary Soil organic matter was extracted by a mixture of O.IM Na 4 P 2 O: O.IM NaOH from a chronosequence of weakly weathered soils developed on aeolian sand, and fractionated into humin (non‐extractable), humic acid, and fulvic acid. The mass of total organic carbon in the profiles, the 14 C content and the 13 C/12C ratios were also determined. The weight of total carbon increased rapidly at first and then gradually without attaining a steady state. This trend was also shown by the humin and fulvic acid fractions, but the humic acid fraction appeared to have reached a maximum after about 3000 years. The order of total weights of the organic fractions was humin > fulvic acid > humic acid. The evidence suggests that the proportions of the humic fractions formed by decomposition are related to soil differences but not to vegetation. The greater part of the plant material found in the soils appears in the humin and fulvic acid fractions.