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Titolo:
Sources of organic and inorganic carbon in a headwater stream: Evidence from carbon isotope studies
Autore:
Palmer, SM; Hope, D; Billett, MF; Dawson, JJC; Bryant, CL;
Indirizzi:
Univ Aberdeen, Dept Plant & Soil Sci, Aberdeen AB24 3UU, Scotland Univ Aberdeen Aberdeen Scotland AB24 3UU ci, Aberdeen AB24 3UU, Scotland Arizona State Univ, Ctr Environm Studies, Tempe, AZ 85287 USA Arizona State Univ Tempe AZ USA 85287 vironm Studies, Tempe, AZ 85287 USA Scottish Enterprise Technol Pk, NERC, Radiocarbon Lab, Glasgow G75 0QF, Lanark, Scotland Scottish Enterprise Technol Pk Glasgow Lanark Scotland G75 0QF , Scotland
Titolo Testata:
BIOGEOCHEMISTRY
fascicolo: 3, volume: 52, anno: 2001,
pagine: 321 - 338
SICI:
0168-2563(200102)52:3<321:SOOAIC>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD; SOIL; C-14; MATTER; DYNAMICS; ONTARIO; PHOTOSYNTHESIS; PEATLAND; SAMPLES; EXPORTS;
Keywords:
C-14; delta C-13; inorganic carbon; organic carbon; peat; streamwater;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Palmer, SM Syracuse Univ, Dept Civil & Environm Engn, 220 Hinds Hall, Syracuse, NY 13244 USA Syracuse Univ 220 Hinds Hall Syracuse NY USA 13244 NY 13244 USA
Citazione:
S.M. Palmer et al., "Sources of organic and inorganic carbon in a headwater stream: Evidence from carbon isotope studies", BIOGEOCHEMI, 52(3), 2001, pp. 321-338

Abstract

A combination of stable isotope studies and C-14 dating were used to identify the main sources and processes controlling streamwater DOC and TIC in atemperate non-forested watershed. delta C-13 values for terrestrial (-24.9to -29.1 parts per thousand) and aquatic (-30.5 to -33.5 parts per thousand) plants were similar to values reported in the literature for similar ecosystems. delta C-13 values for DOC in soil solution and streamwater were consistent with soil and terrestrial vegetation, indicating that the terrestrial ecosystem is the dominant source of aquatic DOC in this watershed. delta C-13 values of soil atmosphere CO2 (-17.2 to -25.2 parts per thousand) were slightly less negative than would be expected for production via aerobicsoil microbial decomposition and root respiration. There was a close correspondence between delta C-13 values (-15.5 to -21.5 parts per thousand) forstreamwater TIC and soil atmospheric CO2 in the central part of the catchment where the stream drains CO2-rich peats. C-14 dating showed that although peat has been accumulating in the watershed for at least 2700 years, DOC in soil pore water and streamwater contains carbon of predominantly recent origin (post-AD 1955).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:11:08