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Titolo:
Temporal changes in chemical properties of air-dried stored soils and their interpretation for long-term experiments
Autore:
Blake, L; Goulding, KWT; Mott, CJB; Poulton, PR;
Indirizzi:
IACR Rothamsted, Dept Soil Sci, Harpenden AL5 2JQ, Herts, England IACR Rothamsted Harpenden Herts England AL5 2JQ n AL5 2JQ, Herts, England Univ Reading, Dept Soil Sci, Reading, Berks, England Univ Reading ReadingBerks England ept Soil Sci, Reading, Berks, England
Titolo Testata:
EUROPEAN JOURNAL OF SOIL SCIENCE
fascicolo: 2, volume: 51, anno: 2000,
pagine: 345 - 353
SICI:
1351-0754(200006)51:2<345:TCICPO>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ROTHAMSTED-EXPERIMENTAL-STATION; UK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Goulding, KWT IACR Rothamsted, Dept Soil Sci, Harpenden AL5 2JQ, Herts, England IACR Rothamsted Harpenden Herts England AL5 2JQ ts, England
Citazione:
L. Blake et al., "Temporal changes in chemical properties of air-dried stored soils and their interpretation for long-term experiments", EUR J SO SC, 51(2), 2000, pp. 345-353

Abstract

The usefulness of stored soils from long-term experiments is often questioned because of changes that might occur during storage. We examined changesduring long-term storage (8-69 years) in the chemical properties of soils with a range of pH values (3.4-8.1 in water) from woodland and grassland experiments at Rothamsted Experimental Station in the UK. No significant changes during storage were measured for total C and N. Large but erratic changes in exchangeable Na+ content between 1959 and 1991 were probably caused by contamination of the 1959 samples by perspiration and from sodium-based glassware. Exchangeable K+ increased during storage but only by a small amount. Small changes in exchangeable Ca2+ and Mg2+ were measured in some samples but not in others. Generally the amount of exchangeable cations increased slightly during storage. This is probably linked to the decreases of lessthan or equal to 0.4 units in the pH of acid soils, which we attribute to the hydrolysis of approximately 0.25% of the exchangeable Al3+. A doubling of the amount of exchangeable Mn2+ during storage for 32 years was probablycaused by re-equilibration of Mn species. The most practicable way to prepare soil samples for long-term storage is to dry them in air. However, those who study changes in soil by re-analysing samples of the soil stored for a long time must (i) use the same methods of analysis, or (ii) demonstrate that different methods lead to the same results, and (iii) know what changes can arise during storage.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 14:13:13