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Titolo:
Evaluating critical soil acidification loads and exceedances for a deciduous forest at the Turkey Lakes Watershed
Autore:
Moayeri, M; Meng, FR; Arp, PA; Foster, NW;
Indirizzi:
Univ New Brunswick, Fac Forestry & Environm Management, Fredericton, NB E3B 6C2, Canada Univ New Brunswick Fredericton NB Canada E3B 6C2 cton, NB E3B 6C2, Canada Canadian Forest Serv, Sault St Marie, ON P6A 5M7, Canada Canadian Forest Serv Sault St Marie ON Canada P6A 5M7 ON P6A 5M7, Canada
Titolo Testata:
ECOSYSTEMS
fascicolo: 6, volume: 4, anno: 2001,
pagine: 555 - 567
SICI:
1432-9840(200109)4:6<555:ECSALA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUGAR MAPLE FOREST; ACID DEPOSITION; CANADA;
Keywords:
soil acidification; critical loads; exceedances; N leaching; base cation leaching; forest biomass growth; scenario evaluations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Arp, PA Univ New Brunswick, Fac Forestry & Environm Management, POB 4400, Fredericton, NB E3B 6C2, Canada Univ New Brunswick POB 4400 Fredericton NB Canada E3B 6C2 , Canada
Citazione:
M. Moayeri et al., "Evaluating critical soil acidification loads and exceedances for a deciduous forest at the Turkey Lakes Watershed", ECOSYSTEMS, 4(6), 2001, pp. 555-567

Abstract

Critical soil acidification loads (CL) and related exceedances, base cation leaching, N leaching, and forest biomass growth were evaluated for a well-studied deciduous forest site within the Turkey Lake Watershed (TLW). The assessment was done by way of steady-state mass balance considerations of primary inputs for N, Ca, Mg, and K. Critical soil acidification rates were found to be high at TLW. These rates amounted to about 900 or 1400 eq/(ha yr) depending on the forest harvesting regime (selective harvest or maintainence of old-growth condition, respectively). The TLW soil substrate (till derived from basaltic bedrock) appeared to weather well, thereby buffering against natural and anthropogenic soil acidification. As a consequence, soilacidification exceedances were estimated to be relatively low for both theselective harvest and old-growth scenarios. In comparing overall S and N input/output data (atmospheric deposition data vs soil leaching losses), we found that the TLW site was essentially near or at S and N saturation. We also found that atmospheric deposition and soil leaching rates have been declining since about 1980. The figures for CL and exceedance varied to some extent depending on the quality of input data and related uncertainties. Estimated exceedances were increased when dry- as well as wet-deposition rateswere considered. They varied depending on the yearly sulfate/nitrate/base-cation mix, and the definition of "acceptable acid leaching. " In addition, they were dependent on whether the forest was considered old growth or not.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/10/20 alle ore 10:00:57