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塞拉多的消防制度及其随着时间的推移而发生的变化
Carlota Segura-Garcia1, Ane Alencar2, Vera L S Arruda2
1Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK.
概括
巴西塞拉多的消防制度正在发生变化. 南部的火灾活动减少,但在中部和北部增加,影响了这种生物多样性大草原生态系统.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 遥感 遥感 遥感 遥感
背景情况:
- 巴西塞拉多,一个生物多样性的萨凡纳,面临着重要的土地转型和人类活动.
- 气候变化和人类的影响正在改变该地区的自然火灾制度.
- 以前对塞拉多火灾制度动态和空间异质性的理解仍然有限.
研究的目的:
- 描述和划分巴西塞拉多地区不同的火灾制度.
- 分析随着时间的推移 (1985-2020年) 火灾特征和空间模式的变化.
- 为了确定塞拉多不同地区火灾活动的趋势.
主要方法:
- 在30公里网格上利用了1985年至2020年的燃烧面积数据.
- 应用了局限空间的层次聚类方法来划分火灾状态区域.
- 在四个连续的9年期间,比较了四个连续的9年期间的火灾制度特征.
主要成果:
- 在1985-1993年和2012-2020年期间,确定了消防制度地区的数量,形状和特征的重大变化.
- 火灾活动水平 (频率,规模,强度) 是区域之间的主要差异化因素.
- 在Cerrado中部和北部观察到火灾活动增加,而南部地区的火灾活动减少.
结论:
- 巴西塞拉多表现出动态和空间异质的火灾制度.
- 火灾活动模式正在发生变化,近几十年来地区的火灾活动有明显的增加和减少.
- 这些发现对于理解生态系统对环境变化下的新型火灾制度的反应至关重要.
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