Zur Charakterisierung von Boden-Huminstoffen

Post, Bernhard; Hempfling, Reinhold; Klamberg, H.; Schulten, H.‐R.

doi:10.1007/bf00481896

Cited by 23 publications

(6 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2d-f) are higher in 0-alkyl and carboxyl C, and lower in aliphatic and aromatic C. The general contrast in intensity distribution between the HAs and the FAs is similar to that previously seen for agricultural (Preston and Blackwell, 1985) and forest (Krosshavn et al, 1992;Post et al, 1988) soils. The alkyl regions of the FAs are also very broad, whereas the HA spectra show relatively sharp maxima especially at 30 ppm for (-CHE-)n.…”

Section: Carbon-13 Nmr Spectroscopysupporting

confidence: 59%

“…Recent studies of forest soils have demonstrated the efficacy of two modern techniques, pyrolysisfield ionization mass spectrometry (Py-FIMS) and nuclear magnetic resonance (NMR) spectroscopy for characterization of organic matter and elucidation of decomposition pathways (Beudert et al, 1989;Hempfling and Schulten, 1990;Hempfling et al, 1987K6gel et al, 1988;K6gel-Knabner et al, 1988K6gel-Knabner et al, , 1991Krosshavn et al, 1992;Post et al, 1988;Zech et al, 1992). While they represent a great advance in our understanding of forest soil organic matter, they have had a narrow emphasis on sites of northern Europe, and for most part, the litter and humus horizons.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of organic matter in a forest soil of coastal British Columbia by NMR and pyrolysis-field ionization mass spectrometry

et al. 1994

View full text Add to dashboard Cite

Organic matter in the soil profile under a young Douglas-fir stand in coastal British Columbia was characterized by examining intact samples of fresh litterfall and organic horizons (LF, H), and fractions (floatables, humic acid [HA], fulvic acid [FA], humin [HU]) from the three mineral horizons (Ae, Bin, BC). Some 30-40% of the carbon in the mineral horizons was found in poorly-decomposed plant material floatable in water, a fraction whose characteristics changed little with depth, and which contained over 1% Fe. The proportion of soil C in HA plus FA was approximately 8%, but the ratio of C in FA/HA increased with depth. Solid-state I3C NMR spectra of litterfall, LH and H samples showed effects of decomposition, in particular a decrease in 0-alkyl C from litterfall to LH to H, and degradation of resolution from LF to H. For the mineral soil fractions, both floatables and de-ashed HU ('HU d' prepared by HCI/HF treatment) indicated high levels of the original plant biopolymers, including a large alkyl component. Solution 13C spectra of the HAs from mineral horizons showed little difference with depth, except that peaks due to lignin were more pronounced for the Bm HA. The NMR spectra of FAs were high in 0-alkyl and carboxyl C. Pyrolysis-field ionization mass spectrometry confirmed and extended the results from NMR and chemical analyses, in particular demonstrating the accumulation of suberin in some fractions and the leaching and decomposition of lignin components with increasing depth in the mineral horizons. The general features of the HA, FA and HUa from this forest soil, and the effects of decomposition and pedogenesis were similar to those widely found for agricultural and forest soils. However, the accumulation of suberin, and the leaching and decomposition of lignin are particularly associated with forest soils. The low proportion of soil C in HA and FA, and the high proportion in poorly decomposed, iron-rich plant fragments suggest that decomposition is somewhat limited at this site, which is classified as having low fertility. The high accumulations of alkyl C from suberin may also indicate, or contribute to inhibition of decomposition.70 Preston et al.

show abstract

Section: Carbon-13 Nmr Spectroscopysupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Characterization of organic matter in a forest soil of coastal British Columbia by NMR and pyrolysis-field ionization mass spectrometry

et al. 1994

View full text Add to dashboard Cite

show abstract

“…On the other hand Posr et al (1988) reported that in the HuF the polysaccharides are more crystalline than in plant litter, because these polysaccharides are clustered to crystal-like moieties due to an increase of covalent bonds ( Nip et al, 1987). These SOM complexes in the HuF are stabilized against thermal and chemical destruction (Schulten, 1984;Post et al, 1988). Perhaps the degree of crystallization affects the nucleus spin resonance within the NMR measurements, because Preston et al (1989) also found a similarity between HuF and HAF.…”

Section: Recent Ideas Of the Chemical Composition Of The Classical Humentioning

confidence: 98%

“…Schnitzer and Neyroud (1975) have made an equivalent proposal for the humic compound structure. The framework of aryl and alkyl units is responsible for the flexibility of the molecules, because the alkyl units in the humic matter connect the stiff benzene rings to a flexible, sponge-like core system which is extremely recalcitrant ( Bracewell et al, 1988;Hempfling et al, 1988;1991;Hempfling and Schulten, 1990;1991;Schulten et al, 1991;Swift, 1992). In this system, pore spaces inside the molecules of the organic compounds create zones where pesticides and other organic pollutants are probably physically trapped ( Sorge et al 1994;Schulten, 1995).…”

Section: Recent Ideas Of the Chemical Composition Of The Classical Humentioning

confidence: 99%

The chemical composition of soil organic matter in classical humic compound fractions and in bulk samples — a review

Beyer

1996

J Plant Nutrition & Soil

View full text Add to dashboard Cite

In the present paper new findings in soil organic matter (SOM) research were reviewed with regard to non‐aromatic species in order to make evident the recent conception about the chemical nature of humic matter structure. The main purpose of this paper was to unravel the manifold information of SOM investigations in order to characterize the classical humic matter fractions (fulvic acids, humic acids, humins) and bulk soil samples. Such common state‐of‐the‐art information is missing in current SOM literature. In addition we focus on improvements in SOM research due to the application of the new instrumental methods such as NMR and pyrolysis‐MS and its problems of analysis.

show abstract

“…The bio-stimulatory activity of HS functioned greatest in fractions with relatively low molecular weight (Vaughan et al, 1985, Post et al, 1988, Nardi et al, 2002. Moreover, relatively low molecular weight HS entered plant cells more readily than their higher molecular weight counterparts.…”

Section: Minerals and Inorganic Compoundsmentioning

confidence: 99%

Humic Substances and the Mechanism of Their Influence on the Production of Higher Green Plants

POPOV¹,

ZELENKOV²,

MARKOV³

et al. 2022

SABRAOJBG

View full text Add to dashboard Cite

The latest research proposed a new point of view about the material composition of so-called 'humic substances,' isolated from natural objects (soils, peats, sapropels, and composts) by alkaline solutions, and presented the conceptual model of direct influence of 'humic substances' on biochemical and biophysical processes into plants. 'Humic substances' are essentially black liquor, i.e., a product artificially obtained because of the alkaline hydrolysis of organic material from natural objects. Black liquor consists of a complex mixture of a variety of organic compounds. According to the proposed model, the biological activity of black liquor connects with accelerating the circulation of nutrients within plants, increasing the permeability of cell membranes, exhibiting de-toxicological properties, optimizing the ratio of organic and mineral anions in plants, and using some HS components as organic nutrients, inducing gene expression. Therefore, humic substances solutions have multifaceted effects on green vascular plants due to their direct influence on biochemical and biophysical processes.

show abstract

Zur Charakterisierung von Boden-Huminstoffen

Cited by 23 publications

References 33 publications

Characterization of organic matter in a forest soil of coastal British Columbia by NMR and pyrolysis-field ionization mass spectrometry

Characterization of organic matter in a forest soil of coastal British Columbia by NMR and pyrolysis-field ionization mass spectrometry

The chemical composition of soil organic matter in classical humic compound fractions and in bulk samples — a review

Humic Substances and the Mechanism of Their Influence on the Production of Higher Green Plants

Contact Info

Product

Resources

About