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Titolo:
Organic geochemical studies of soils from the Rothamsted classical experiments - V. The fate of lipids in different long-term experiments
Autore:
Bull, ID; van Bergen, PF; Nott, CJ; Poulton, PR; Evershed, RP;
Indirizzi:
Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England Univ Bristol Bristol Avon England BS8 1TS Bristol BS8 1TS, Avon, England IACR Rothamsted, Dept Soil Sci, Harpenden AL5 2JQ, Herts, England IACR Rothamsted Harpenden Herts England AL5 2JQ n AL5 2JQ, Herts, England
Titolo Testata:
ORGANIC GEOCHEMISTRY
fascicolo: 5, volume: 31, anno: 2000,
pagine: 389 - 408
SICI:
0146-6380(2000)31:5<389:OGSOSF>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROMORPHIC FOREST-PODZOL; PLANT RESIDUES; MARINE-SEDIMENTS; FECAL MATERIAL; MATTER; COPROSTANOL; FRACTION; ALCOHOLS; STEROLS; INPUTS;
Keywords:
grassland; lipid; soil pH; stanol; sitosterol; woodland vegetation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Evershed, RP Univ Bristol, Sch Chem, Cantocks Close, Bristol BS8 1TS, Avon, England Univ Bristol Cantocks Close Bristol Avon England BS8 1TS land
Citazione:
I.D. Bull et al., "Organic geochemical studies of soils from the Rothamsted classical experiments - V. The fate of lipids in different long-term experiments", ORG GEOCHEM, 31(5), 2000, pp. 389-408

Abstract

Lipid extracts from four long-term experiments (Broadbalk Wilderness, Geescroft Wilderness, Hoosfield Spring Barley and Park Grass) were analysed using a combination of gas chromatography, gas chromatography-mass spectrometry and gas chromatography-combustion-isotope ratio mass spectrometry. The lipid content of the primary organic inputs for each soil were also analysed in order to assess the early diagenetic fate of the various compound classes present. Soil pH was observed to either directly or indirectly, have a significant effect on lipids with a relative increase in abundance of n-alkanes at higher pH (7.31) and a large relative increase in n-alkanoic and omega-hydroxy acids at low pH (3.74). Triacylglycerols exhibited severe losses irrespective of pH. In an arable soil, n-alkanoic acids showed a temporal decrease in concentration whilst levels of n-alkanols remained static, the difference was ascribed to a more rapid turnover and possible leachate migration of the n-alkanoic acids. The phytosterol, sitosterol, was observed to rapidly diminish in soils possibly as a result of assimilation by soil dwelling invertebrates. Analysis of 5 beta-stigmastanol (a faecal biomarker) showed that it remained at levels indicative of manuring even after 113 years. Furthermore, analysis of 5 beta-stanyl esters revealed a manuring signal even more persistent than that exhibited by the free stanols. Knowledge of the biogeochemical cycling of lipids in the soil environment will help facilitate understanding of the processes which underpin carbon cycling in soils. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 20:15:50