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Titolo:
A Chionochloa/Sphagnum/cushion valley bog in east Otago, New Zealand
Autore:
Walker, S; Steel, JB; Rapson, GL; Roxburgh, SH; King, WM; Watkins, AJ; Myers, TE; Keogh, JA; McQueen, AAM; Wilson, JB;
Indirizzi:
Univ Otago, Dept Bot, Dunedin, New Zealand Univ Otago Dunedin New Zealand iv Otago, Dept Bot, Dunedin, New Zealand Massey Univ, Ecol Grp, Inst Nat Resources, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand Palmerston North, New Zealand Australian Natl Univ, Inst Adv Studies, RSBS, Ecosyst Dynam Grp, Canberra,ACT 0200, Australia Australian Natl Univ Canberra ACT Australia 0200 erra,ACT 0200, Australia NSW Agr, Arg Res & Vet Ctr, Orange, NSW 2800, Australia NSW Agr Orange NSW Australia 2800 & Vet Ctr, Orange, NSW 2800, Australia Dunedin City Council, Dunedin Bot Garden, Dunedin, New Zealand Dunedin City Council Dunedin New Zealand t Garden, Dunedin, New Zealand Univ Otago, Portobello Marine Lab, Portobello, New Zealand Univ Otago Portobello New Zealand o Marine Lab, Portobello, New Zealand
Titolo Testata:
NEW ZEALAND JOURNAL OF ECOLOGY
fascicolo: 1, volume: 25, anno: 2001,
pagine: 39 - 52
SICI:
0110-6465(2001)25:1<39:ACVBIE>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTH-ISLAND; VEGETATION HISTORY; RAISED-BOG; ECOLOGY;
Keywords:
bog; conservation; fen; mire; ombrotrophic; rheotrophic; Sphagnum;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Wilson, JB Univ Otago, Dept Bot, POB 56, Dunedin, New Zealand Univ Otago POB 56 Dunedin New Zealand 6, Dunedin, New Zealand
Citazione:
S. Walker et al., "A Chionochloa/Sphagnum/cushion valley bog in east Otago, New Zealand", NZ J ECOL, 25(1), 2001, pp. 39-52

Abstract

A valley mire was sampled on the flanks of Swampy Hill, east Otago, New Zealand. It formed in a narrow valley, apparently originally comprising two basins. The end of the mire nearest the outlet contained species typical of fens (i.e., rheotrophic mires). At the head of the valley there was a section of the mire with mixed vegetation cover comprising the tussock grass Chionochloa rubra, Sphagnum species, and cushion/herb/shrub cover. Ombrotrophic status of this section was indicated by a slightly raised profile, greater acidity, lower exchangeable Na and K, and lower substrate cation exchangecapacity, identifying it as a bog. Total Ca:Mg molar ratios were generallyabove 1.0, but this rule-of-thumb for ombrotrophic status may be inapplicable here. It is not known whether New Zealand Sphagnum species are as efficient at lowering the pH as those investigated elsewhere. Macrofosssil evidence indicates that some components of the bog, such as Sphagnum and epacridaceous subshrubs, have remained constant, almost since the inception of thebog. However, Empodisma minus, currently absent from the bog and rare in the region, was present at one stage. The change from cover with Empodisma and Dracophyllum as significant components, to the present Chionochloa/Sphagnum/cushion composition, occurred a few hundred years ago, probably initiated by fire. Comparison with preliminary information for other bogs suggeststhat those in the eastern part of the South Island vary considerably in species composition, with individualistic assemblages of species. The site isseen as having high conservation values. To protect these values the bog needs protection from invasive exotic weeds, and from damage by wild pigs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 12:20:03