Late Quaternary vegetation and fire history in the northernmost Nothofagus forest region: Mallín Vaca Lauquen, Neuquén Province, Argentina

Vera Markgraf, Cathy Whitlock, Scott R Anderson, Adriana García

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The last 16 000 cal. a of vegetation, fire and limnological history are described from the steppe-forest ecotone in the northernmost Nothofagus forest region east of the Andes (Mallín Vaca Lauquen, Neuquén Province, Argentina, latitude 36° 51.336' S, longitude 71° 02.538' W). Between 16 000 and 14 800 cal. a BP, scrub steppe with substantial open ground expanded in formerly glaciated valleys, whereas Nothofagus-Prumnopitys andina woodland covered mountain slopes. The site was a relatively deep and unproductive small lake at this time. After 14 800 cal. a BP, both steppe and woodland vegetation became denser, indicating increased moisture and temperatures, although not to present levels. The lake was still relatively deep and dystrophic, but became more alkaline by 10 000 cal. a BP. Between 8900 and 5500 cal. a BP, conditions were markedly drier than before; a Cyperaceae marsh developed and disturbance taxa increased. After 5500 cal. a BP, moisture increased but varied greatly, as evidenced by fluctuating water levels and high fire activity from 5500 to 4400 cal. a BP and from 2300 to 1000 cal. a BP. Human activity, in terms of forest clearance and livestock grazing, is documented in the uppermost levels. The evidence of high environmental variability in the middle and late Holocene is consistent with the onset or strengthening of the El Niño-Southern Oscillation, but differences in the timing of fire activity among sites on the west and east sides of the Andes suggest that fuel conditions were important in determining the local occurrence of fire.

Original languageEnglish (US)
Pages (from-to)248-258
Number of pages11
JournalJournal of Quaternary Science
Volume24
Issue number3
DOIs
StatePublished - 2009

Fingerprint

vegetation history
fire history
steppe
woodland
moisture
forest clearance
forest-steppe
vegetation
Southern Oscillation
lake
ecotone
scrub
marsh
livestock
water level
human activity
grazing
Holocene
disturbance
valley

Keywords

  • Fire and climate history
  • Holocene vegetation
  • Lateglacial
  • Mid-latitude Argentine andes

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

Late Quaternary vegetation and fire history in the northernmost Nothofagus forest region : Mallín Vaca Lauquen, Neuquén Province, Argentina. / Markgraf, Vera; Whitlock, Cathy; Anderson, Scott R; García, Adriana.

In: Journal of Quaternary Science, Vol. 24, No. 3, 2009, p. 248-258.

Research output: Contribution to journalArticle

@article{0861748b9fb34669aee5b5ff3e9a74de,
title = "Late Quaternary vegetation and fire history in the northernmost Nothofagus forest region: Mall{\'i}n Vaca Lauquen, Neuqu{\'e}n Province, Argentina",
abstract = "The last 16 000 cal. a of vegetation, fire and limnological history are described from the steppe-forest ecotone in the northernmost Nothofagus forest region east of the Andes (Mall{\'i}n Vaca Lauquen, Neuqu{\'e}n Province, Argentina, latitude 36° 51.336' S, longitude 71° 02.538' W). Between 16 000 and 14 800 cal. a BP, scrub steppe with substantial open ground expanded in formerly glaciated valleys, whereas Nothofagus-Prumnopitys andina woodland covered mountain slopes. The site was a relatively deep and unproductive small lake at this time. After 14 800 cal. a BP, both steppe and woodland vegetation became denser, indicating increased moisture and temperatures, although not to present levels. The lake was still relatively deep and dystrophic, but became more alkaline by 10 000 cal. a BP. Between 8900 and 5500 cal. a BP, conditions were markedly drier than before; a Cyperaceae marsh developed and disturbance taxa increased. After 5500 cal. a BP, moisture increased but varied greatly, as evidenced by fluctuating water levels and high fire activity from 5500 to 4400 cal. a BP and from 2300 to 1000 cal. a BP. Human activity, in terms of forest clearance and livestock grazing, is documented in the uppermost levels. The evidence of high environmental variability in the middle and late Holocene is consistent with the onset or strengthening of the El Ni{\~n}o-Southern Oscillation, but differences in the timing of fire activity among sites on the west and east sides of the Andes suggest that fuel conditions were important in determining the local occurrence of fire.",
keywords = "Fire and climate history, Holocene vegetation, Lateglacial, Mid-latitude Argentine andes",
author = "Vera Markgraf and Cathy Whitlock and Anderson, {Scott R} and Adriana Garc{\'i}a",
year = "2009",
doi = "10.1002/jqs.1233",
language = "English (US)",
volume = "24",
pages = "248--258",
journal = "Journal of Quaternary Science",
issn = "0267-8179",
publisher = "John Wiley and Sons Ltd",
number = "3",

}

TY - JOUR

T1 - Late Quaternary vegetation and fire history in the northernmost Nothofagus forest region

T2 - Mallín Vaca Lauquen, Neuquén Province, Argentina

AU - Markgraf, Vera

AU - Whitlock, Cathy

AU - Anderson, Scott R

AU - García, Adriana

PY - 2009

Y1 - 2009

N2 - The last 16 000 cal. a of vegetation, fire and limnological history are described from the steppe-forest ecotone in the northernmost Nothofagus forest region east of the Andes (Mallín Vaca Lauquen, Neuquén Province, Argentina, latitude 36° 51.336' S, longitude 71° 02.538' W). Between 16 000 and 14 800 cal. a BP, scrub steppe with substantial open ground expanded in formerly glaciated valleys, whereas Nothofagus-Prumnopitys andina woodland covered mountain slopes. The site was a relatively deep and unproductive small lake at this time. After 14 800 cal. a BP, both steppe and woodland vegetation became denser, indicating increased moisture and temperatures, although not to present levels. The lake was still relatively deep and dystrophic, but became more alkaline by 10 000 cal. a BP. Between 8900 and 5500 cal. a BP, conditions were markedly drier than before; a Cyperaceae marsh developed and disturbance taxa increased. After 5500 cal. a BP, moisture increased but varied greatly, as evidenced by fluctuating water levels and high fire activity from 5500 to 4400 cal. a BP and from 2300 to 1000 cal. a BP. Human activity, in terms of forest clearance and livestock grazing, is documented in the uppermost levels. The evidence of high environmental variability in the middle and late Holocene is consistent with the onset or strengthening of the El Niño-Southern Oscillation, but differences in the timing of fire activity among sites on the west and east sides of the Andes suggest that fuel conditions were important in determining the local occurrence of fire.

AB - The last 16 000 cal. a of vegetation, fire and limnological history are described from the steppe-forest ecotone in the northernmost Nothofagus forest region east of the Andes (Mallín Vaca Lauquen, Neuquén Province, Argentina, latitude 36° 51.336' S, longitude 71° 02.538' W). Between 16 000 and 14 800 cal. a BP, scrub steppe with substantial open ground expanded in formerly glaciated valleys, whereas Nothofagus-Prumnopitys andina woodland covered mountain slopes. The site was a relatively deep and unproductive small lake at this time. After 14 800 cal. a BP, both steppe and woodland vegetation became denser, indicating increased moisture and temperatures, although not to present levels. The lake was still relatively deep and dystrophic, but became more alkaline by 10 000 cal. a BP. Between 8900 and 5500 cal. a BP, conditions were markedly drier than before; a Cyperaceae marsh developed and disturbance taxa increased. After 5500 cal. a BP, moisture increased but varied greatly, as evidenced by fluctuating water levels and high fire activity from 5500 to 4400 cal. a BP and from 2300 to 1000 cal. a BP. Human activity, in terms of forest clearance and livestock grazing, is documented in the uppermost levels. The evidence of high environmental variability in the middle and late Holocene is consistent with the onset or strengthening of the El Niño-Southern Oscillation, but differences in the timing of fire activity among sites on the west and east sides of the Andes suggest that fuel conditions were important in determining the local occurrence of fire.

KW - Fire and climate history

KW - Holocene vegetation

KW - Lateglacial

KW - Mid-latitude Argentine andes

UR - http://www.scopus.com/inward/record.url?scp=66049090770&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=66049090770&partnerID=8YFLogxK

U2 - 10.1002/jqs.1233

DO - 10.1002/jqs.1233

M3 - Article

AN - SCOPUS:66049090770

VL - 24

SP - 248

EP - 258

JO - Journal of Quaternary Science

JF - Journal of Quaternary Science

SN - 0267-8179

IS - 3

ER -