Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1809758115 |
Grassland fire ecology has roots in the late Miocene | |
Karp, Allison T.1; Behrensmeyer, Anna K.2; Freeman, Katherine H.1 | |
2018-11-27 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:48页码:12130-12135 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | That fire facilitated the late Miocene C-4 grassland expansion is widely suspected but poorly documented. Fire potentially tied global climate to this profound biosphere transition by serving as a regional-to-local driver of vegetation change. In modern environments, seasonal extremes in moisture amplify the occurrence of fire, disturbing forest ecosystems to create niche space for flammable grasses, which in turn provide fuel for frequent fires. On the Indian subcontinent, C-4 expansion was accompanied by increased seasonal extremes in rainfall (evidenced by delta O-18(carbonate)), which set the stage for fuel accumulation and fire-linked clearance during wet-to-dry seasonal transitions. Here, we test the role of fire directly by examining the abundance and distribution patterns of fire-derived polycyclic aromatic hydrocarbons (PAHs) and terres-trial vegetation signatures in n-alkane carbon isotopes from paleosol samples of the Siwalik Group (Pakistan). Two million years before the C-4 grassland transition, fire-derived PAH concentrations increased as conifer vegetation declined, as indicated by a decrease in retene. This early increase in molecular fire signatures suggests a transition to more fire-prone vegetation such as a C-3 grassland and/or dry deciduous woodland. Between 8.0 and 6.0 million years ago, fire, precipitation seasonality, and C-4-grass dominance increased simultaneously (within resolution) as marked by sharp increases in fire-derived PAHs, delta O-18(carbonate), and C-13 enrichment in n-alkanes diagnostic of C-4 grasses. The strong association of evidence for fire occurrence, vegetation change, and landscape opening indicates that a dynamic fire-grassland feedback system was both a necessary precondition and a driver for grassland ecology during the first emergence of C-4 grasslands. |
英文关键词 | C-4 grassland expansion paleofire polycyclic aromatic hydrocarbons leaf wax carbon isotopes Mio-Pliocene |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451351000044 |
WOS关键词 | POLYCYCLIC AROMATIC-HYDROCARBONS ; STABLE-ISOTOPES ; C-4 GRASSLAND ; VEGETATION ; EXPANSION ; CLIMATE ; EVOLUTION ; BIOMASS ; RATIOS ; PLANTS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205015 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 2.Smithsonian Inst, Museum Nat Hist, Evolut Terr Ecosyst Program, Dept Paleobiol, Washington, DC 20013 USA |
推荐引用方式 GB/T 7714 | Karp, Allison T.,Behrensmeyer, Anna K.,Freeman, Katherine H.. Grassland fire ecology has roots in the late Miocene[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(48):12130-12135. |
APA | Karp, Allison T.,Behrensmeyer, Anna K.,&Freeman, Katherine H..(2018).Grassland fire ecology has roots in the late Miocene.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(48),12130-12135. |
MLA | Karp, Allison T.,et al."Grassland fire ecology has roots in the late Miocene".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.48(2018):12130-12135. |
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