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Titolo:
Dissolved organic carbon losses from grazed grasslands under different management regimes
Autore:
McTiernan, KB; Jarvis, SC; Scholefield, D; Hayes, MHB;
Indirizzi:
Inst Grassland & Environm Res, N Wyke Res Stn, Okehampton EX20 2SB, Devon,England Inst Grassland & Environm Res Okehampton Devon England EX20 2SB n,England Univ Limerick, Limerick, Ireland Univ Limerick Limerick IrelandUniv Limerick, Limerick, Ireland
Titolo Testata:
WATER RESEARCH
fascicolo: 10, volume: 35, anno: 2001,
pagine: 2565 - 2569
SICI:
0043-1354(200107)35:10<2565:DOCLFG>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELD DRAINAGE; DENITRIFICATION; WATER; SWARDS;
Keywords:
dissolved organic carbon; grassland; soil; fertilizer; runoff; drainage; lysimeters;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: McTiernan, KB Inst Grassland & Environm Res, N Wyke Res Stn, Okehampton EX20 2SB, Devon,England Inst Grassland & Environm Res Okehampton Devon England EX20 2SB
Citazione:
K.B. McTiernan et al., "Dissolved organic carbon losses from grazed grasslands under different management regimes", WATER RES, 35(10), 2001, pp. 2565-2569

Abstract

Dissolved organic matter (DOM) is fundamental to many biogeochemical processes in soils and natural waters. Despite the large number of studies reporting on DOM losses from forest soils and in surface waters there is little published data on exports from managed grasslands. The objective of our study was to determine the extent of short-term exports of dissolved organic carbon (DOC) from managed grazed grasslands and to evaluate the influence offertilizer management and drainage regime. DOC discharged from grazed grassland plots, with a range of management strategies, was determined over 2 months. Total export varied from 42 to 118 kg C ha(-1), and was greater fromsome plots than literature estimates for annual losses from all catchment types. There was a significant (P = 0.048) positive correlation between DOCexport and rates of nitrogen application for treatments with no artificialdrainage. Increased dry matter production arising from increased fertilizer-N inputs is suggested as an important factor in this relationship. DOC export was significantly (P = 0.032) reduced by artificial drainage and adsorption of DOC to soil surfaces and the restriction of decomposition due to waterlogging are suggested as two possible explanations. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 03:59:04