Interactions between rainfall, deforestation and fires during recent years in the Brazilian Amazonia.

Interactions between rainfall, deforestation and fires during recent years in the Brazilian Amazonia.
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DOI:
10.1098/rstb.2007.0026
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发表时间:
2008-05-27
期刊:
Philosophical transactions of the Royal Society of London. Series B, Biological sciences
影响因子:
--
通讯作者:
Saatchi S
Saatchi S
中科院分区:
其他
文献类型:
--
作者:
Aragão LE;Malhi Y;Barbier N;Lima A;Shimabukuro Y;Anderson L;Saatchi S

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了解气候和土地利用动态之间的相互作用是评估亚马逊河流域对气候变化脆弱性的一个基本问题。在这项研究中,我们分析卫星派生的每月和每年的降雨量,火灾和森林砍伐的时间序列,明确量化的季节性模式和这三个变量之间的关系,特别侧重于2005年的亚马逊干旱。我们的研究结果表明,一个显着的季节性,每年一个峰值分析的所有变量,除了森林砍伐。对于年度周期,我们发现相关性超过90%,变量之间存在时滞。砍伐森林和火灾分别在雨季高峰后三个月和六个月达到最高值。1998 - 2004年,热像元的累积数量与每年毁林面积的大小呈线性相关(r2=0.84,p=0.004)。在2005年的干旱期间,热像素的数量比类似的森林砍伐面积的预期值增加了43%(约为100%)。19 000平方公里)。  我们证明,人为强迫,如土地利用的变化,是决定性的,在确定火灾发生的季节性和年度模式。此外,即使森林砍伐率下降,干旱也会大大增加该地区的火灾数量。我们可以预期,亚马逊河流域目前采用刀耕火种的方式砍伐森林,并利用火管理土地,这将加剧与自然气候变异或人类引起的气候变化有关的干旱的影响,因此,大片森林边缘将面临更大的火灾风险。
Understanding the interplay between climate and land-use dynamics is a fundamental concern for assessing the vulnerability of Amazonia to climate change. In this study, we analyse satellite-derived monthly and annual time series of rainfall, fires and deforestation to explicitly quantify the seasonal patterns and relationships between these three variables, with a particular focus on the Amazonian drought of 2005. Our results demonstrate a marked seasonality with one peak per year for all variables analysed, except deforestation. For the annual cycle, we found correlations above 90% with a time lag between variables. Deforestation and fires reach the highest values three and six months, respectively, after the peak of the rainy season. The cumulative number of hot pixels was linearly related to the size of the area deforested annually from 1998 to 2004 (r2=0.84, p=0.004). During the 2005 drought, the number of hot pixels increased 43% in relation to the expected value for a similar deforested area (approx. 19 000 km2). We demonstrated that anthropogenic forcing, such as land-use change, is decisive in determining the seasonality and annual patterns of fire occurrence. Moreover, droughts can significantly increase the number of fires in the region even with decreased deforestation rates. We may expect that the ongoing deforestation, currently based on slash and burn procedures, and the use of fires for land management in Amazonia will intensify the impact of droughts associated with natural climate variability or human-induced climate change and, therefore, a large area of forest edge will be under increased risk of fires.
DOI: 10.1098/rstb.2007.0024
发表时间: 2008-05-27
期刊: Philosophical transactions of the Royal Society of London. Series B, Biological sciences
影响因子: --
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