Model-Based Estimation of Amazonian Forests Recovery Time after Drought and Fire Events
Model-Based Estimation of Amazonian Forests Recovery Time after Drought and Fire Events
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DOI：
10.3390/f12010008
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发表时间：
2021-01-01
期刊：
影响因子：
2.9
通讯作者：
Collalti, Alessio
中科院分区：
文献类型：
--
作者：
De Faria, Bruno L.;Marano, Gina;Collalti, Alessio
近几十年来，干旱、森林砍伐和野火已成为反复出现的现象，严重影响了亚马逊河流域的人类活动和自然生态系统。生态系统从碳损失中恢复所需的时间是评估干扰对森林影响的关键指标。然而，很少有人知道这些干扰的影响，单独和协同作用，森林恢复时间和由此产生的时空格局在区域范围内。在这项研究中，我们结合了3-PG森林生长模型，遥感和现场推导的方程，映射亚马逊全（3公里的空间分辨率）的影响和恢复时间的地上生物量（AGB）干旱，火灾和伐木和火灾相结合。结果表明，干旱、火烧和采伐+火烧区的AGB分别减少4%、19%和46%，AGB恢复时间干旱区平均为27年，火烧区平均为44年，采伐+火烧区平均为63年，在高火强度区最大可达184年。我们的研究结果为亚马逊干旱和野火的时空模式提供了两个主要见解：（1）盆地东南部森林恢复时间较长，（2）随着干旱和野火变得越来越频繁--因为干旱和野火之间的间隔比森林再生的速度要短--它们造成的长期损害可能导致这些脆弱生态系统的永久性和不断增加的碳损失。
In recent decades, droughts, deforestation and wildfires have become recurring phenomena that have heavily affected both human activities and natural ecosystems in Amazonia. The time needed for an ecosystem to recover from carbon losses is a crucial metric to evaluate disturbance impacts on forests. However, little is known about the impacts of these disturbances, alone and synergistically, on forest recovery time and the resulting spatiotemporal patterns at the regional scale. In this study, we combined the 3-PG forest growth model, remote sensing and field derived equations, to map the Amazonia-wide (3 km of spatial resolution) impact and recovery time of aboveground biomass (AGB) after drought, fire and a combination of logging and fire. Our results indicate that AGB decreases by 4%, 19% and 46% in forests affected by drought, fire and logging + fire, respectively, with an average AGB recovery time of 27 years for drought, 44 years for burned and 63 years for logged + burned areas and with maximum values reaching 184 years in areas of high fire intensity. Our findings provide two major insights in the spatial and temporal patterns of drought and wildfire in the Amazon: (1) the recovery time of the forests takes longer in the southeastern part of the basin, and, (2) as droughts and wildfires become more frequent-since the intervals between the disturbances are getting shorter than the rate of forest regeneration-the long lasting damage they cause potentially results in a permanent and increasing carbon losses from these fragile ecosystems.