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Titolo:
The origin of soil organic C, dissolved organic C and respiration in a long-term maize experiment in Halle, germany, determined by C-13 natural abundance
Autore:
Flessa, H; Ludwig, B; Heil, B; Merbach, W;
Indirizzi:
Univ Gottingen, Inst Soil Sci & Forest Nutr, D-37077 Gottingen, Germany Univ Gottingen Gottingen Germany D-37077 utr, D-37077 Gottingen, Germany Univ Halle Wittenberg, Inst Plant Nutr & Soil Sci, D-06108 Halle, Germany Univ Halle Wittenberg Halle Germany D-06108 Sci, D-06108 Halle, Germany
Titolo Testata:
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE
fascicolo: 2, volume: 163, anno: 2000,
pagine: 157 - 163
SICI:
1436-8730(200004)163:2<157:TOOSOC>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
CULTIVATED SOILS; CARBON DYNAMICS; MATTER TURNOVER; NITROUS-OXIDE; FERTILIZATION; RESIDUES; STORAGE; CO2;
Keywords:
DOC; soil organic matter; soil respiration; maize; C-13;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Flessa, H Univ Gottingen, Inst Soil Sci & Forest Nutr, Busgenweg 2, D-37077 Gottingen, Germany Univ Gottingen Busgenweg 2 Gottingen Germany D-37077 n, Germany
Citazione:
H. Flessa et al., "The origin of soil organic C, dissolved organic C and respiration in a long-term maize experiment in Halle, germany, determined by C-13 natural abundance", J PLANT NU, 163(2), 2000, pp. 157-163

Abstract

For a quantitative analysis of SOC dynamics it is necessary to trace the origins of the soil organic compounds and the pathways of their transformations. We used the C-13 isotope to determine the incorporation of maize residues into the soil organic carbon (SOC), to trace the origin of the dissolved organic carbon (DOC), and to quantify the fraction of the maize C in the soil respiration. The maize-derived SOC was quantified in soil samples collected to a depth of 65 cm from two plots, one 'continuous maize' and the other 'continuous rye' (reference site) from the long-term field experiment 'Ewiger Roggen' in Halle. This field trial was established in 1878 and was partly changed to a continuous maize cropping system in 1961. Production rates and delta(13)C of DOC and CO2 were determined for the Ap horizon in incubation experiments with undisturbed soil columns. After 37 years of continuous maize cropping, 15% of the total SOC in the topsoil originated from maize C. The fraction of the maize-derived C below the ploughed horizon was only 5 to 3%. The total amount of maize C stored inthe profile was 9080 kg ha(-1) which was equal to about 31% of the estimated total C input via maize residues (roots and stubble). Total leaching of DOC during the incubation period of 16 weeks was 1.1 g m(-2) and one third of the DOC derived from maize C. The specific DOC production rate from the maize-derived SOC was 2.5 times higher than that from the older humus formed by Cg plants. The total CO2-C emission for 16 weeks was 18 g m(-)2. Fifty-eight percent of the soil respiration originated from maize C. The specific CO2 formation from maize-derived SOC was 8 times higher than that from the older SOC formed by C-3 plants. The ratio of DOC production to CO2-C production was three times smaller for the young, maize-derived SC than for theolder humus formed by C-3 plants.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:42:19