Soil Organic Matter

Konova, M. M.; Broadbent, F. E.

doi:10.1097/00010694-196301000-00017

Cited by 113 publications

(94 citation statements)

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“…of the organic matter of these two soils differed markedly (the Melfort was about 600 years older than the Waitville). The E4/E6 ratios of the Melfort and Waitville humates also indicated that these soils were from different great soil groups (7). A comparison of the results obtained with and without acid pretreatment suggests that, in the Waitville soil, the clay plays a greater role in stabilizing humic carbon than do the metallicions; in the Melfort soil; however, the metallic ions play as important a role in stabilizing humic carbon as does the clay.…”

Section: Discussionmentioning

confidence: 90%

Applicability of the Carbon-Dating Method of Analysis to Soil Humus Studies

et al. 1967

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The organic fraction of soil is known to be composed of the soil biomass, partially decomposed plant and animal residues, and the materials commonly referred to as humic substances. Knowledge of the persistence of these fractions in soil is vital to the understanding of their contribution to soil fertility and soil genesis. Much information concerning the biochemistry of the humus materials also could be obtained through a knowledge of the mean residence times of the various organic fractions.The nature of the organic compounds and of the organo-mineral bonds varies from soil to soil; consequently, the relative stability of the organic matter of different soils should also vary (8, 16). Tyurin investigated the nature of the humus of the main soil types of the U.S.S.R. He found that the chernozemic humic acids were relatively complex with a preponderance of calcium humates, which were said to be very stable. In contrast, the humus of podzolic soils was associated primarily with nonsilicate forms of iron and aluminum and consisted of relatively simple organic structures. These were thought to be relatively mobile and unstable (7, 17).The availability of the carbon-dating technique has made it feasible to determine the mean residence time of soil humic fractions (2, 4, 11). Thus, the general postulations concerning the relative stability of the soil humic components can now be tested. Campbell and Paul (3) discussed the factors which affect the accuracy of the carbon-dating method of analysis when applied to soils. Isotopic fractionation of the carbon isotopes results in a fairly constant correction to each apparent mean residence time (m.r.t.). No large error was observed to result from the increase of nuclear-bomb-produced C14 in the atmosphere; other errors were relatively small. The present study was undertaken to utilize the natural C14 activity of the carbon in the various organic fractions to provide an accurate comparison of the relative stability of a number of soil organic matter fractions.

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Section: Discussionmentioning

confidence: 90%

Applicability of the Carbon-Dating Method of Analysis to Soil Humus Studies

et al. 1967

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“…The main characteristics of the soil are: umbric horizon, umbric andosol soil with pine wood and ulex as vegetation, located at Monte Castelo (A Coruña, Spain), bedrock being gabbros. The elemental composition of the FA sample obtained with an EA-1108 Analyzer was: 48.80 % C, 2.35 % N, 44.45 % O and 4.70 % H which are typical values for this type of substances (Aiken, 1985;Kononova, 1961;Kumada, 1987;Orlov, 1985;Schnitzer and Khan, 1972;Stevenson, 1994). From UV-vis spectroscopic measurements an estimation of the molecular weight (1,200) and aromaticity (15.64%) was obtained (Chin et al, 1994).…”

Section: Fa Sample Characterizationmentioning

confidence: 89%

Determination of intrinsic complexation parameters for Cu²⁺and a soil fulvic acid by ion selective electrode

Gondar

Fiol

López

et al. 2000

Chemical Speciation & Bioavailability

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“…3. Humic acid was obtained with a 0.1 rr Na,P,O,.10 IIO/0.1 N NaOH mixture as described by Kononova (1966), and purified by exhaustive electrodialysis.…”

Section: Methodsmentioning

confidence: 99%

CHEMICAL PROPERTIES OF ORGANIC MATTER EXTRACTED FROM A NUMBER OF Ah HORIZONS BY A NUMBER OF METHODS

Dormaar¹

1972

Can. J. Soil. Sci.

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Soil Organic Matter

Cited by 113 publications

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Applicability of the Carbon-Dating Method of Analysis to Soil Humus Studies

Applicability of the Carbon-Dating Method of Analysis to Soil Humus Studies

Determination of intrinsic complexation parameters for Cu²⁺and a soil fulvic acid by ion selective electrode

CHEMICAL PROPERTIES OF ORGANIC MATTER EXTRACTED FROM A NUMBER OF Ah HORIZONS BY A NUMBER OF METHODS

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Soil Organic Matter

Cited by 113 publications

References 0 publications

Applicability of the Carbon-Dating Method of Analysis to Soil Humus Studies

Applicability of the Carbon-Dating Method of Analysis to Soil Humus Studies

Determination of intrinsic complexation parameters for Cu2+and a soil fulvic acid by ion selective electrode

CHEMICAL PROPERTIES OF ORGANIC MATTER EXTRACTED FROM A NUMBER OF Ah HORIZONS BY A NUMBER OF METHODS

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Determination of intrinsic complexation parameters for Cu²⁺and a soil fulvic acid by ion selective electrode