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Article: Combining multi-temporal airborne LiDAR and Sentinel-2 multispectral data for assessment of disturbances and recovery of mangrove forests

TitleCombining multi-temporal airborne LiDAR and Sentinel-2 multispectral data for assessment of disturbances and recovery of mangrove forests
Authors
KeywordsCanopy structure
LiDAR
Moth pest
NDVI
Overstory and understory
Typhoon
Issue Date29-Jul-2023
PublisherElsevier
Citation
Estuarine, Coastal and Shelf Science, 2023, v. 291 How to Cite?
Abstract

Disturbances such as tropical cyclones and insect pests in mangroves can cause defoliation, tree mortality, and other changes in ecosystem processes. Understanding the resistance and resilience of mangroves to disturbance is critical to developing strategies for conservation. However, most studies apply multi-temporal optical data which have limited power to detect structural changes, especially for forests with complex architectures. We combined multispectral Sentinel-2 (S2) images and airborne LiDAR Scanning (ALS) datasets to assemble a comprehensive view of the effects of two disturbance events (a moth pest and a super-typhoon) on mangroves in Mai Po, Hong Kong. A series of normalized difference vegetation index (NDVI) estimates derived from S2 data indicated changes in greenness before and after the moth pest and typhoon events. An object-based stratification method was applied with ALS data to separate the overstory and understory to distinguish stratum changes. The results showed that moth larvae were more likely to encroach leafy mangroves of Avicennia marina. Double-layered and single-layered short mangroves have better resistance to typhoons than younger tall mangroves without understory beneath. NDVI recovered rapidly after three to six months post-disturbance but significant changes in canopy structures were found from the ALS data. Canopy gaps increased both in size and quantity in mature overstory areas, likely benefitting the growth of the understories beneath. Finally, the understory area grew resulting in a transition from single-layered to double-layered structures. The combination of multi-temporal LiDAR and multispectral data used here highlights the power of complementary remote sensing products in documenting mangrove ecosystem processes.


Persistent Identifierhttp://hdl.handle.net/10722/331315
ISSN
2023 Impact Factor: 2.6
2023 SCImago Journal Rankings: 0.760
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Qiaosi-
dc.contributor.authorBonebrake, Timothy C-
dc.contributor.authorMichalski, Joseph R-
dc.contributor.authorWong, Frankie Kwan Kit-
dc.contributor.authorFung, Tung-
dc.date.accessioned2023-09-21T06:54:38Z-
dc.date.available2023-09-21T06:54:38Z-
dc.date.issued2023-07-29-
dc.identifier.citationEstuarine, Coastal and Shelf Science, 2023, v. 291-
dc.identifier.issn0272-7714-
dc.identifier.urihttp://hdl.handle.net/10722/331315-
dc.description.abstract<p>Disturbances such as tropical cyclones and insect pests in mangroves can cause defoliation, tree mortality, and other changes in ecosystem processes. Understanding the resistance and resilience of mangroves to disturbance is critical to developing strategies for conservation. However, most studies apply multi-temporal optical data which have limited power to detect structural changes, especially for forests with complex architectures. We combined multispectral Sentinel-2 (S2) images and airborne LiDAR Scanning (ALS) datasets to assemble a comprehensive view of the effects of two disturbance events (a moth pest and a super-typhoon) on mangroves in Mai Po, Hong Kong. A series of normalized difference vegetation index (NDVI) estimates derived from S2 data indicated changes in greenness before and after the moth pest and typhoon events. An object-based stratification method was applied with ALS data to separate the overstory and understory to distinguish stratum changes. The results showed that moth larvae were more likely to encroach leafy mangroves of Avicennia marina. Double-layered and single-layered short mangroves have better resistance to typhoons than younger tall mangroves without understory beneath. NDVI recovered rapidly after three to six months post-disturbance but significant changes in canopy structures were found from the ALS data. Canopy gaps increased both in size and quantity in mature overstory areas, likely benefitting the growth of the understories beneath. Finally, the understory area grew resulting in a transition from single-layered to double-layered structures. The combination of multi-temporal LiDAR and multispectral data used here highlights the power of complementary remote sensing products in documenting mangrove ecosystem processes.<br></p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofEstuarine, Coastal and Shelf Science-
dc.subjectCanopy structure-
dc.subjectLiDAR-
dc.subjectMoth pest-
dc.subjectNDVI-
dc.subjectOverstory and understory-
dc.subjectTyphoon-
dc.titleCombining multi-temporal airborne LiDAR and Sentinel-2 multispectral data for assessment of disturbances and recovery of mangrove forests-
dc.typeArticle-
dc.identifier.doi10.1016/j.ecss.2023.108444-
dc.identifier.scopuseid_2-s2.0-85166251672-
dc.identifier.volume291-
dc.identifier.isiWOS:001054727700001-
dc.identifier.issnl0272-7714-

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