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Titre du document / Document title

Late-glacial and Holocene climatic effects on fire and vegetation dynamics at the prairie-forest ecotone in south-central Minnesota

Auteur(s) / Author(s)

CAMILL Philip (1) ; UMBANHOWAR Charles E. (2) ; TEED Rebecca (3) ; GEISS Christoph E. (4) ; ALDINGER Jessica (2) ; DVORAK Leah (2) ; KENNING Jon (1) ; LIMMER Jacob (1) ; WALKUP Kristina (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Biology, Carleton College, One North College Street, Northfield, MN 55057, ETATS-UNIS
(2) Department of Biology, St Olaf College, 1520 St Olaf Avenue, Northfield, MN 55057, ETATS-UNIS
(3) Limnological Research Center, University of Minnesota, 310 Pillsbury Dr SE, Minneapolis, MN 55455, ETATS-UNIS
(4) Department of Physics, Trinity College, 300 Summit Street, Hartford, CT 06106, ETATS-UNIS

Résumé / Abstract

1 Treeline ecotones, such as the prairie-forest boundary, represent climatically sensitive regions where the relative abundance of vegetation types is controlled by complex interactions between climate and local factors. Responses of vegetation and fire to climate change may be tightly linked as a result of strong feedbacks among fuel production, vegetation structure and fire frequency/severity, but the importance of these feedbacks for controlling the stability of this ecotone is unclear. 2 In this study, we examined the prairie-forest ecotone in south-central Minnesota using two lake sediment cores to reconstruct independent records of climate, vegetation and fire over the past 12 500 years. Using pollen, charcoal, sediment magnetic analyses and LOI properties, we investigated whether fires were controlled directly by climate or indirectly by fuel production. 3 Sediment magnetic and LOI data suggest four broad climatic periods occurring c. 11 350-8250 BP(cool/humid), c. 8250-4250 BP(warm/dry), c. 4250-2450 BP (warm/ humid), and c. 2450-0 BP (cool/humid), indicating that, since the mid-Holocene, climate has shifted towards wetter conditions favouring greater in-lake production and fuel production on the landscape. 4 The area surrounding both lakes was characterized by boreal forest c. 12 500-10 000 BP, changing to an Ulmus-Ostrya forest c. 10 000-9000 BP, changing to a community dominated by prairie (Poaceae-Ambrosia-Artemisia) and deciduous forest taxa c. 8000-4250 BP, and finally shifting to a Quercus-dominated woodland/savanna beginning c. 4250-3000 BP. 5 Charcoal influx increased from an average of 0.11-0.62 mm2 cm-2 year-1 during the early Holocene forest period (c. 11 350-8250 BP) to 1.71-3.36 mm2 cm-2 year-1 during the period of prairie expansion (c. 8250-4250 BP) and again increased to 4.18-4.90 mm2 cm-2 year-1 at the start of the woodland/savanna period (c. 4250 BP). 6 As a result of the influence of climate on community composition and fuel productivity, changes in fire severity may be the result and not the cause of shifts in vegetation.

Revue / Journal Title

Journal of ecology    ISSN  0022-0477   CODEN JECOAB 

Source / Source

2003, vol. 91, no5, pp. 822-836 [15 page(s) (article)] (2 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Blackwell, Oxford, ROYAUME-UNI  (1913) (Revue)

Mots-clés anglais / English Keywords

America

;

North America

;

United States

;

Climate

;

Minnesota

;

Ecotone

;

Forests

;

Grassland

;

Vegetation dynamics

;

Vegetation fire

;

Fire

;

Fire effect

;

Holocene

;

Mots-clés français / French Keywords

Amérique

;

Amérique du Nord

;

Etats Unis

;

Climat

;

Minnesota

;

Ecotone

;

Forêt

;

Prairie

;

Dynamique végétation

;

Feu végétation

;

Incendie

;

Action feu

;

Holocène

;

Mots-clés espagnols / Spanish Keywords

America

;

America del norte

;

Estados Unidos

;

Clima

;

Minesota

;

Ecotono

;

Bosque

;

Pradera

;

Dinámica vegetación

;

Fuego vegetación

;

Incendio

;

Acción fuego

;

Holoceno

;

Localisation / Location

INIST-CNRS, Cote INIST : 2004, 35400011318467.0100

Nº notice refdoc (ud4) : 15163238



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