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Titolo:
PHOSPHORUS STATUS OF FOREST AND AGRICULTURAL SOILS FROM A WATERSHED OF HIGH ANIMAL DENSITY
Autore:
SIMARD RR; CLUIS D; GANGBAZO G; BEAUCHEMIN S;
Indirizzi:
AGR CANADA,SOILS & CROPS RES CTR,2560 HOCELAGA BLVD ST FOY PQ G1V 2J3CANADA INRS EAU ST FOY PQ G1V 4C7 CANADA DEA,MEF ST FOY PQ G1S 2L4 CANADA
Titolo Testata:
Journal of environmental quality
fascicolo: 5, volume: 24, anno: 1995,
pagine: 1010 - 1017
SICI:
0047-2425(1995)24:5<1010:PSOFAA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC PHOSPHORUS; GRASSLAND SOILS; FERTILIZER; MANURE; FORMS; FRACTIONATION; AVAILABILITY; CULTIVATION; EXTRACTANT; DISPOSAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
R.R. Simard et al., "PHOSPHORUS STATUS OF FOREST AND AGRICULTURAL SOILS FROM A WATERSHED OF HIGH ANIMAL DENSITY", Journal of environmental quality, 24(5), 1995, pp. 1010-1017

Abstract

The objective of this work was to study the impact of animal density on P status in soils from the Beaurivage River Watershed, Quebec, Canada. Twenty-Eve samples from A, B, and C horizons from the five most representative soil series were taken from sites under forest, hay fields of dairy farms, and farms with a known surplus of on-farm manure N (SN). Profiles were characterized for water-soluble P (P-w), Mehlich-3 extractable P (M3P), and P fractions. The P-w was 3.6 times larger in agricultural than in forest soils in the A horizon. Excessive amounts of 66.5 mg kg(-1) of M3P and of 95 mg kg(-1) Resin-P were found in theplow layer of agricultural soils and M3P was increased, on average, by 10 mg kg(-1) in the C horizon compared with forest soils. The accumulation of added P has lead to an increase in labile (Resin + NaHCO3 + NaOH-P-o) P pools in the A horizon, whereas the resilient (total labile P) pools were the major sinks in B and C horizons. For SN farms, total P was increased by 435 mg kg(-1) in the A, 86 mg kg(-1) in B, and by 141 mg kg(-1) in the C horizon compared with forest soils. Dairy farms soils had labile P contents similar to those from SN farms but wereless enriched in resilient-P-i forms. The observed large P loads in surface horizons and P-w increases in the subsoil of the agricultural soils probably contribute to the contamination of surface waters in this watershed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 19:16:09