دورية أكاديمية
Soil carbon loss and weak fire feedbacks during Pliocene C₄ grassland expansion in Australia ; Soil carbon loss and weak fire feedbacks during Pliocene C(4) grassland expansion in Australia
| العنوان: | Soil carbon loss and weak fire feedbacks during Pliocene C₄ grassland expansion in Australia ; Soil carbon loss and weak fire feedbacks during Pliocene C(4) grassland expansion in Australia |
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| المؤلفون: | Karp, A.T., Andrae, J.W., McInerney, F.A., Polissar, P.J., Freeman, K.H. |
| المصدر: | http://dx.doi.org/10.1029/2020gl090964Test. |
| بيانات النشر: | American Geophysical Union (AGU) |
| سنة النشر: | 2021 |
| المجموعة: | The University of Adelaide: Digital Library |
| مصطلحات موضوعية: | C₄ grassland expansion, polycyclic aromatic hydrocarbons (PAHs), paleofire, soil carbon remobilization, Western Australia |
| الوصف: | C₄ grasslands proliferated later in Australia than they did on other continents (∼3.5 Ma vs. 10–5 Ma). It remains unclear whether this delay reflects differences in climate conditions or ecological feedbacks, such as fire, that promote C₄ ecosystems. Here, we evaluated these factors using terrestrial biomarkers from marine sediments off western Australia. Fire‐derived polycyclic aromatic hydrocarbons (PAH) indicate fire ecology did not substantially change during or following C₄ expansion. The presence of fire‐adapted C₃ woody vegetation likely diminished the role of fire and delayed C₄ expansion until it was prompted by climate drying between 3.5 and 3.0 Ma. At the same time, mass accumulation rates of weathered PAHs increased 100‐fold, which indicates a significant loss of soil carbon accompanied this ecosystem shift. The tight couplings between hydroclimate and carbon storage altered boundary conditions for Australian ecosystems, and similar abrupt behavior may shape environmental responses to climate change. ; Allison T. Karp, Jake W. Andrae, Francesca A. McInerney, Pratigya J. Polissar and Katherine H. Freeman |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0094-8276 1944-8007 |
| العلاقة: | http://purl.org/au-research/grants/arc/LE160100067Test; http://purl.org/au-research/grants/arc/FT110100100793Test; Geophysical Research Letters, 2021; 48(2):e2020GL090964-1-e2020GL090964-10; http://hdl.handle.net/2440/130181Test; McInerney, F.A. [0000-0002-2020-6650] |
| DOI: | 10.1029/2020gl090964 |
| الإتاحة: | https://doi.org/10.1029/2020gl090964Test http://hdl.handle.net/2440/130181Test |
| حقوق: | © 2020. American Geophysical Union. All Rights Reserved. |
| رقم الانضمام: | edsbas.94F5BC19 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 00948276 19448007 |
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| DOI: | 10.1029/2020gl090964 |