Physicochemical Properties of Humus of a Semiarid Pampean Soil Under Two Crop Rotations

Rosell, R. A.; Zech, Wolfgang; Haumaier, Ludwig; Miglierina, A.M.

doi:10.1080/15324989509385896

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…However changes in total aromatic area (106184 ppm) were negligible (Table 3). Rosell et al (1995) reported that decrease of aromatic carbon content in HA can be due to soil management.…”

Section: Nmr Spectramentioning

confidence: 99%

Changes of humic acids structure on selected key monitoring localities of arable soils

Barančíková¹

2002

Plant Soil Environ.

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Soil fertility is largely determined by the content and quality of soil organic matter. SlovakRepublic monitoring system includes evaluation of soil humus content, basic humic parameters and also chemical structure of humic acids (HA). Changes in humic acids structure on five selected key localities during monitoring period (1994–2000) are presented in this study. Among soil types, essentially between Chernozem and Planosol, in elemental analysis, optical parameter and 13C NMR parameters significant differences determined by Student’s test were observed (Tables 2 and 3). During monitoring period small oxidation trend mainly on Calcaric Fluvisol and Planosol HA expressed by increase of oxygen content and O/C, O/H ratio was observed. Oxidation trends during monitoring period confirm also position of Calcaric Fluvisol and Planosol HA on van Krevelen diagram. Changes in optical parameter E1%6and content of carboxylic groups for the period of monitoring were negligible. Some changes throughout monitoring in 13C NMR parameters were recorded. On all observed HA considerable decrease of carbon in region 106–143 ppm, characteristic for aromatic and olefinic carbon with C–C, C–H bond, was observed. Spectroscopic parameters are in good agreement with elemental analysis and carboxylic groups. Joint relationships between changes in determined parameters are expressed by significant linear correlations. Predominantly between parameters calculated from 13C NMR spectra and data of elemental analysis and optical parameter E1%6highly significant linear correlations (R > 0.93) are found (Table 4).

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“…However changes in total aromatic area (106184 ppm) were negligible (Table 3). Rosell et al (1995) reported that decrease of aromatic carbon content in HA can be due to soil management.…”

Section: Nmr Spectramentioning

confidence: 99%

Changes of humic acids structure on selected key monitoring localities of arable soils

Barančíková¹

2002

Plant Soil Environ.

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Black carbon in the zonal steppe soils of Russia

Rodionov

Amelung

Haumaier

et al. 2006

Z. Pflanzenernähr. Bodenk.

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Black Mollisols are typically rich in charred organic matter, however, little is known about the zonal distribution of black C (BC) in steppe soils. In this study, we used benzene polycarboxylic acids (BPCA) as specific markers for BC in particle‐size fractions of depth profiles in several zonal soils (Greyzem, Phaeozem, Chernozem, Kastanozem) of the Russian steppe. In addition, liquid‐state 13C‐NMR spectra were obtained on the alkaline‐soluble soil organic matter (SOM). The results showed that both the content and depth distribution of BC varies in the different soil types; the concentration of BC in the bulk top soils being closely related to the aromaticity of the SOM (r2 = 0.98 for the native topsoils, 0.83 for top‐ and subsurface soils). Especially the Chernozems were rich in aromatic SOM, which partly contained more than 17% BC of total C, most of which being allocated in the mineral fractions. Long‐term arable cropping did not reduce the BC contents of the surface soil, though it did promote the enrichment of BC in the silt fractions. The same shift was detected as soil depth increased. We conclude that BC is not fully inert in these soils, but apparently can be preserved in the silt as decomposition of SOM increased, i.e., it accumulates exactly in that fraction, which has been formerly assigned to contain old, aromatic C.

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Characteristics of humic substances in cultivated and natural forest soils of Sikkim

et al. 1998

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Physicochemical Properties of Humus of a Semiarid Pampean Soil Under Two Crop Rotations

Cited by 3 publications

References 11 publications

Changes of humic acids structure on selected key monitoring localities of arable soils

Changes of humic acids structure on selected key monitoring localities of arable soils

Black carbon in the zonal steppe soils of Russia

Characteristics of humic substances in cultivated and natural forest soils of Sikkim

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