Impact of a tropical forest blowdown on aboveground carbon balance.

Impact of a tropical forest blowdown on aboveground carbon balance.
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DOI:
10.1038/s41598-021-90576-x
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发表时间:
2021-05-28
期刊:
影响因子:
4.6
通讯作者:
Kellner JR
Kellner JR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cushman KC;Burley JT;Imbach B;Saatchi SS;Silva CE;Vargas O;Zgraggen C;Kellner JR

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Field measurements demonstrate a carbon sink in the Amazon and Congo basins, but the cause of this sink is uncertain. One possibility is that forest landscapes are experiencing transient recovery from previous disturbance. Attributing the carbon sink to transient recovery or other processes is challenging because we do not understand the sensitivity of conventional remote sensing methods to changes in aboveground carbon density (ACD) caused by disturbance events. Here we use ultra-high-density drone lidar to quantify the impact of a blowdown disturbance on ACD in a lowland rain forest in Costa Rica. We show that the blowdown decreased ACD by at least 17.6%, increased the number of canopy gaps, and altered the gap size-frequency distribution. Analyses of a canopy-height transition matrix indicate departure from steady-state conditions. This event will initiate a transient sink requiring an estimated 24–49 years to recover pre-disturbance ACD. Our results suggest that blowdowns of this magnitude and extent can remain undetected by conventional satellite optical imagery but are likely to alter ACD decades after they occur.
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