Arid
DOI10.1088/1748-9326/9/10/104015
Enhanced Australian carbon sink despite increased wildfire during the 21st century
Kelley, D. I.1; Harrison, S. P.1,2
通讯作者Kelley, D. I.
来源期刊ENVIRONMENTAL RESEARCH LETTERS
ISSN1748-9326
出版年2014
卷号9期号:10
英文摘要

Climate projections show Australia becoming significantly warmer during the 21st century, and precipitation decreasing over much of the continent. Such changes are conventionally considered to increase wildfire risk. Nevertheless, we show that burnt area increases in southern Australia, but decreases in northern Australia. Overall the projected increase in fire is small (0.72-1.31% of land area, depending on the climate scenario used), and does not cause a decrease in carbon storage. In fact, carbon storage increases by 3.7-5.6 Pg C (depending on the climate scenario used). Using a process-based model of vegetation dynamics, vegetation-fire interactions and carbon cycling, we show increased fire promotes a shift to more fire-adapted trees in wooded areas and their encroachment into grasslands, with an overall increase in forested area of 3.9-11.9%. Both changes increase carbon uptake and storage. The increase in woody vegetation increases the amount of coarse litter, which decays more slowly than fine litter hence leading to a relative reduction in overall heterotrophic respiration, further reducing carbon losses. Direct CO2 effects increase woody cover, water-use efficiency and productivity, such that carbon storage is increased by 8.5-14.8 Pg C compared to simulations in which CO2 is held constant at modern values. CO2 effects tend to increase burnt area, fire fluxes and therefore carbon losses in arid areas, but increase vegetation density and reduce burnt area in wooded areas.


英文关键词carbon cycle fire regimes CO2 fertilization water-use efficiency dynamic vegetation modeling future environmental changes
类型Article
语种英语
国家Australia ; England
收录类别SCI-E
WOS记录号WOS:000344964000019
WOS关键词GLOBAL FIRE EMISSIONS ; CLIMATE ; CO2 ; FOREST ; IMPACT ; COVER
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/181944
作者单位1.Macquarie Univ, Sch Biol Sci, N Ryde, NSW 2109, Australia;
2.Univ Reading, Sch Archaeol Geog & Environm Sci, Reading RG6 6AH, Berks, England
推荐引用方式
GB/T 7714
Kelley, D. I.,Harrison, S. P.. Enhanced Australian carbon sink despite increased wildfire during the 21st century[J],2014,9(10).
APA Kelley, D. I.,&Harrison, S. P..(2014).Enhanced Australian carbon sink despite increased wildfire during the 21st century.ENVIRONMENTAL RESEARCH LETTERS,9(10).
MLA Kelley, D. I.,et al."Enhanced Australian carbon sink despite increased wildfire during the 21st century".ENVIRONMENTAL RESEARCH LETTERS 9.10(2014).
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