Paper · 2022 · Philosophical Transactions of the Royal Society B Biological Sciences

Implications of tropical cyclones on damage and potential recovery and restoration of logged forests in Vietnam

S. M. Stas; B. D. Spracklen; P. D. Willetts; et al.

6
claims
12
verbatim quotes
16
citations
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Open access

Abstract

Many natural forests in Southeast Asia are degraded following decades of logging. Restoration of these forests is delayed by ongoing logging and tropical cyclones, but the implications for recovery are largely uncertain. We analysed meteorological, satellite and forest inventory plot data to assess the effect of Typhoon Doksuri, a major tropical cyclone, on the forest landscapes of central Vietnam consisting of natural forests and plantations. We estimated the return period for a cyclone of this intensity to be 40 years. Plantations were almost twice as likely to suffer cyclone damage compared to natural forests. Logged natural forests (9–12 years after cessation of government-licensed logging) were surveyed before and after the storm with 2 years between measurements and remained a small biomass carbon sink (0.1 ± 0.3 Mg C ha −1 yr −1 ) over this period. The cyclone reduced the carbon sink of recovering natural forests by an average of 0.85 Mg C ha −1 yr −1 , less than the carbon loss due to ongoing unlicensed logging. Restoration of forest landscapes in Southeast Asia requires a reduction in unlicensed logging and prevention of further conversion of degraded natural forests to plantations, particularly in landscapes prone to tropical cyclones where natural forests provide a resilient carbon sink. This article is part of the theme issue ‘Understanding forest landscape restoration: reinforcing scientific foundations for the UN Decade on Ecosystem Restoration’.

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Claims 6

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Plantations were almost twice as likely as natural forests to suffer cyclone damage.

Taxon
Plantationse2
Outcome
suffer cyclone damagee2
Direction
almost twice as likelye2
Value
almost twicee2
Comparator
natural forestse2

Verbatim

e2

“Plantations were almost twice as likely to suffer cyclone damage compared to natural forests”

✓ located verbatim in the source · abstract, characters 527–619 · show in text ↑
Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Typhoon Doksuri reduced the carbon sink of recovering natural forests by an average of 0.85 Mg C ha −1 yr −1.

Taxon
natural forestse3
Treatment
Typhoon Doksurie6
Outcome
carbon sinke3
Direction
reducede3
Value
0.85 Mg C ha −1 yr −1e3
Comparator
before and after the storme4

Verbatim

e3

“The cyclone reduced the carbon sink of recovering natural forests by an average of 0.85 Mg C ha −1 yr −1, less than the carbon loss due to ongoing unlicensed logging”

✓ located after whitespace/quote normalisation · abstract, characters 868–1034 · show in text ↑
e4

“Logged natural forests (9–12 years after cessation of government-licensed logging) were surveyed before and after the storm with 2 years between measurements”

✓ located verbatim in the source · abstract, characters 621–778 · show in text ↑
e6

“We analysed meteorological, satellite and forest inventory plot data to assess the effect of Typhoon Doksuri, a major tropical cyclone, on the forest landscapes of central Vietnam”

✓ located verbatim in the source · abstract, characters 221–400 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

The cyclone reduction of the recovering natural forest carbon sink was smaller than the carbon loss from ongoing unlicensed logging.

Taxon
natural forestse3
Treatment
Typhoon Doksurie6
Outcome
carbon sinke3
Direction
less thane3
Comparator
carbon loss due to ongoing unlicensed logginge3

Verbatim

e3

“The cyclone reduced the carbon sink of recovering natural forests by an average of 0.85 Mg C ha −1 yr −1, less than the carbon loss due to ongoing unlicensed logging”

✓ located after whitespace/quote normalisation · abstract, characters 868–1034 · show in text ↑
e6

“We analysed meteorological, satellite and forest inventory plot data to assess the effect of Typhoon Doksuri, a major tropical cyclone, on the forest landscapes of central Vietnam”

✓ located verbatim in the source · abstract, characters 221–400 · show in text ↑
Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Logged natural forests remained a small biomass carbon sink of 0.1 ± 0.3 Mg C ha −1 yr −1 over the study period.

Taxon
Logged natural forestse4
Outcome
biomass carbon sinke5
Value
0.1 ± 0.3 Mg C ha −1 yr −1e5
Setting
central Vietname6

Verbatim

e4

“Logged natural forests (9–12 years after cessation of government-licensed logging) were surveyed before and after the storm with 2 years between measurements”

✓ located verbatim in the source · abstract, characters 621–778 · show in text ↑
e5

“remained a small biomass carbon sink (0.1 ± 0.3 Mg C ha −1 yr −1) over this period”

✓ located after whitespace/quote normalisation · abstract, characters 783–866 · show in text ↑
e6

“We analysed meteorological, satellite and forest inventory plot data to assess the effect of Typhoon Doksuri, a major tropical cyclone, on the forest landscapes of central Vietnam”

✓ located verbatim in the source · abstract, characters 221–400 · show in text ↑
Observationobservedoriginal resultmeasured

Claim · model-written summary

The return period for a cyclone of the intensity of Typhoon Doksuri is estimated at 40 years.

Taxon
natural forestse0
Outcome
return period for a cyclone of this intensitye1
Value
40 yearse1

Verbatim

e0

“Many natural forests in Southeast Asia are degraded following decades of logging”

✓ located verbatim in the source · abstract, characters 0–80 · show in text ↑
e1

“We estimated the return period for a cyclone of this intensity to be 40 years”

✓ located verbatim in the source · abstract, characters 448–525 · show in text ↑

schema checkedfield values found in the cited quotesPermalinkReport an issue

Recommendationauthor interpretationoriginal resultbasis n/a

Claim · model-written summary

Restoration of forest landscapes in Southeast Asia requires reducing unlicensed logging and preventing conversion of degraded natural forests to plantations.

Taxon
natural forestse7
Outcome
reduction in unlicensed logging and prevention of further conversione7

Verbatim

e7

“Restoration of forest landscapes in Southeast Asia requires a reduction in unlicensed logging and prevention of further conversion of degraded natural forests to plantations”

✓ located verbatim in the source · abstract, characters 1036–1209 · show in text ↑