What was burning in the past? Charcoal identifications supplement an early-Holocene fire-history reconstruction in Yellowstone National Park, USA

نویسندگان

چکیده

Analysis of charcoal particles preserved in lake sediments has been frequently used to reconstruct fire, vegetation and climate history. Larger macroscopic (>125 μm) are attributed local fires, whereas microscopic (<125 μm), observed on pollen slides, a signal regional fire. Taxonomic identification the adds fire-history reconstruction by providing information about fuel composition past fire conditions. Identification can unravel one longstanding questions regarding regimes, namely what was burning. This paper describes an analysis small closed-basin Yellowstone National Park. Blacktail Pond (44.954°N, 110.604°W; 2012 m elev) is located steppe surrounded conifer forest. Previous studies site have presented multi-proxy environmental history last 14,650 years. The focus this investigation early-Holocene (11,500–9900 cal yr BP). Thirty-nine sediment samples were taken at 0.5 cm intervals examine particles, with attention two large peaks 10,970 10,200 BP that registered or near-site fires. Twenty-eight contained 243 large-enough (180–250 be examined scanning electron microscopy. We able identify conifers (Pinus, Picea, Abies Juniperus), Artemisia unidentified deciduous shrubs, monocotyledons. first burned mixture fuels, second episode Artemisia, shrubs herbs but no conifers. results consistent previous interpretations indicate open mixed-conifer forest early Holocene prior 10,750 BP, replaced Pinus contorta slopes valley. relative dominance contorta-type points importance as catalyst for spread species.

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ژورنال

عنوان ژورنال: Quaternary International

سال: 2021

ISSN: ['1873-4553', '1040-6182']

DOI: https://doi.org/10.1016/j.quaint.2020.09.033