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Titolo:
Response of soil microbial communities to single and multiple doses of an organic pollutant
Autore:
Thompson, IP; Bailey, MJ; Ellis, RJ; Maguire, N; Meharg, AA;
Indirizzi:
NERC, Inst Virol & Environm Microbiol, Oxford OX1 3SR, England NERC Oxford England OX1 3SR Environm Microbiol, Oxford OX1 3SR, England NERC, Inst Terr Ecol, Huntingdon PE17 2LS, England NERC Huntingdon England PE17 2LS Terr Ecol, Huntingdon PE17 2LS, England
Titolo Testata:
SOIL BIOLOGY & BIOCHEMISTRY
fascicolo: 1, volume: 31, anno: 1999,
pagine: 95 - 105
SICI:
0038-0717(199901)31:1<95:ROSMCT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUBSTRATE UTILIZATION PATTERNS; PSEUDOMONAS SP; DEGRADATION; POPULATIONS; METABOLISM; CHEMICALS; BACTERIUM; DIVERSITY; CADMIUM; PUTIDA;
Keywords:
1,2-dichlorobenzene; soil microbiology; microbial biomass; bacterial diversity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Thompson, IP NERC,dInst Virol & Environm Microbiol, Mansfield Rd, Oxford OX1 3SR, Englan NERC Mansfield Rd Oxford England OX1 3SR ord OX1 3SR, Englan
Citazione:
I.P. Thompson et al., "Response of soil microbial communities to single and multiple doses of an organic pollutant", SOIL BIOL B, 31(1), 1999, pp. 95-105

Abstract

The effect of 100 mu g 1,2-dichlorobenzene (1,2-DCB) g(-1) dry weight (dw)of soil introduced either as a single dose or multiple (10 fortnightly) doses of 10 mu g g(-1) dw, on the microbial biomass, diversity of culturable bacterial community and the rate of 1,2-DCB mineralisation, were compared. After 22 weeks exposure both application regimes significantly reduced total bacterial counts and viable fungal hyphal length. The single dose had thegreatest overall inhibitory effect, although the extent of inhibition varied throughout the study. Total culturable bacterial counts, determined after 22 weeks exposure showed little response to 1,2-DCB, but pseudomonad counts in single and multiple treatments were reduced to 9.7 and 0.147%, respectively, of the numbers detected in the control soil. The effect of 1,2-DCB application on the taxonomic composition of the culturable bacteria community was determined by fatty acid methyl ester (FAME) analysis. Compared to control soils, the single dose treatment had a lower percentage of Arthrobacter and Micrococcus. Multiple applications had a significant effect upon pseudomonad abundance, which represented only 2% of the identified community,compared to 45.6% in the control. The multi-dosed soils contained a high percentage of bacilli (> 25%). The effects of 1,2-DCB applications on the metabolic potential of the soil microbial community was determined by BIOLOG profiling. The number of carbon compounds utilised by the community in the multi-dosed soils (49 positives) was significantly less (P < 0.05) than detected in the single dose treatment (76) and control (66). The rate of 1,2-DCB mineralisation, determined by (CO2)-C-14 production from radiolabelled [UL-C-14] 1,2-DCB, declined throughout the study, and after 22 weeks was slightly but significantly (P < 0.05) lower in the multiply- than the singly-dosed sails. The differential response to 1,2-DCB treatments was attributed to its reduced bioavailability in soils after a single exposure, compared to multiple applications. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 15:02:46