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Titolo:
Potential for preferential pathways of phosphorus transport
Autore:
Simard, RR; Beauchemin, S; Haygarth, PM;
Indirizzi:
Agr & Agri Food Canada, Soils & Crops Res Ctr, St Foy, PQ G1V 2J3, Canada Agr & Agri Food Canada St Foy PQ Canada G1V 2J3 t Foy, PQ G1V 2J3, Canada Inst Grassland & Environm Res, Okehampton EX20 2SB, Devon, England Inst Grassland & Environm Res Okehampton Devon England EX20 2SB , England
Titolo Testata:
JOURNAL OF ENVIRONMENTAL QUALITY
fascicolo: 1, volume: 29, anno: 2000,
pagine: 97 - 105
SICI:
0047-2425(200001/02)29:1<97:PFPPOP>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
CLAY SOIL; FERTILIZER APPLICATION; GRAZED GRASSLAND; SURFACE RUNOFF; WATER; DRAINAGE; MACROPORES; ABUNDANCE; FRACTIONS; MOVEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Simard, RR Agr & Agri Food Canada, Soils & Crops Res Ctr, 2560 Hochelaga Blvd, St Foy, PQ G1V 2J3, Canada Agr & Agri Food Canada 2560 Hochelaga Blvd St Foy PQ Canada G1V 2J3
Citazione:
R.R. Simard et al., "Potential for preferential pathways of phosphorus transport", J ENVIR Q, 29(1), 2000, pp. 97-105

Abstract

This paper briefly reviews the existing literature and uses evidence from three studies to demonstrate the occurrence of preferential pathways of P transport through soil. Studies conducted in the St. Lawrence lowlands, Canada, indicated that particulate P (PP-i.e., >0.45 mu m) is the main fractionof total P (TP) in tile-drainage water generated by storm events after periods of low rainfall. In the remainder of the year, the concentration of TPand P forms were related to soil texture, primary tillage intensity and frequency, and showed wide seasonal variations. For a study conducted in the UK under grassland, higher TP concentrations were found in near-surface runoff (0-30 cm) compared with concentrations measured in drainflow. Water passing through the artificial drainage system had a higher proportion of PP (43%) than water passing close to (<30 cm) or over the soil surface (31%). Installation of tile drainage in a poorly draining soil reduces P transfer by improving the infiltration capacity, thereby reducing overland flow volume and allowing P to be retained/sorbed by the soil matrix. Because of the absence of tillage, permanent grasslands accumulate P near the surface. We hypothesize that, if the soil P store is coincident with preferential flow pathways (either artificial mole drainage channels or natural macropores), permanent grassland will be vulnerable to transfer large amounts of P through subsurface pathways. Phosphorus transfer through preferential flow pathways may be particularly important after storm events that rapidly follow periods of drought and/or surface P inputs as inorganic fertilizer or manure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:25:23