A lake sediment–based paleoecological reconstruction of late Holocene fire history and vegetation change in Great Basin National Park, Nevada, USA

Analyses of macroscopic charcoal, sediment geochemistry (%C, %N, C/N, δ13C, δ15N), and fossil pollen were conducted on a sediment core recovered from Stella Lake, Nevada, establishing a 2000 year record of fire history and vegetation change for the Great Basin. Charcoal accumulation rates (CHAR) ind...

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Published in:Quaternary research 2021-11, Vol.104, p.28-42
Main Authors: Cooper, Christopher S., Porinchu, David F., Reinemann, Scott A., Mark, Bryan G., DeGrand, James Q.
Format: Article
Language:English
Subjects:
Catchment scale
Catchments
Charcoal
Climate change
Community composition
Ecosystems
Fires
Geochemistry
Glaciation
Holocene
Hydroclimate
Lake sediments
Lakes
National parks
Paleoecology
Pollen
Precipitation
Relative abundance
Research Article
Sediments
Vegetation
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cited_by cdi_FETCH-LOGICAL-a322t-459c89f42ae3ed5fe2f1f22c1a29a642ce36c3fbe617c2e7a5944d049f4c05703
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container_title Quaternary research
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creator Cooper, Christopher S.
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Mark, Bryan G.
DeGrand, James Q.
description Analyses of macroscopic charcoal, sediment geochemistry (%C, %N, C/N, δ13C, δ15N), and fossil pollen were conducted on a sediment core recovered from Stella Lake, Nevada, establishing a 2000 year record of fire history and vegetation change for the Great Basin. Charcoal accumulation rates (CHAR) indicate that fire activity, which was minimal from the beginning of the first millennium to AD 750, increased slightly at the onset of the Medieval Climate Anomaly (MCA). Observed changes in catchment vegetation were driven by hydroclimate variability during the early MCA. Two notable increases in CHAR, which occurred during the Little Ice Age (LIA), were identified as major fire events within the catchment. Increased C/N, enriched δ15N, and depleted δ13C values correspond with these events, providing additional evidence for the occurrence of catchment-scale fire events during the late fifteenth and late sixteenth centuries. Shifts in the vegetation community composition and structure accompanied these fires, with Pinus and Picea decreasing in relative abundance and Poaceae increasing in relative abundance following the fire events. During the LIA, the vegetation change and lacustrine geochemical response was most directly influenced by the occurrence of catchment-scale fires, not regional hydroclimate.
doi_str_mv 10.1017/qua.2021.17
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source Cambridge Journals Online
subjects Catchment scale
Catchments
Charcoal
Climate change
Community composition
Ecosystems
Fires
Geochemistry
Glaciation
Holocene
Hydroclimate
Lake sediments
Lakes
National parks
Paleoecology
Pollen
Precipitation
Relative abundance
Research Article
Sediments
Vegetation
title A lake sediment–based paleoecological reconstruction of late Holocene fire history and vegetation change in Great Basin National Park, Nevada, USA
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