Cold Wave-Induced Reductions in NDII and ChlRE for North-Western Pacific Mangroves Varies with Latitude and Climate History

Mangrove forests growing at the poleward edges of their geographic distribution are occasionally subject to freezing (0 °C) events. Cold wave effects on mangrove trees are well documented and adaptation to cold stress has been reported for local mangrove populations in the North Atlantic. However, t...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Switzerland), 2021-07, Vol.13 (14), p.2732
Main Authors: Peereman, Jonathan, Hogan, J. Aaron, Lin, Teng-Chiu
Format: Article
Language:English
Subjects:
Canopies
Chlorophyll
chlorophyll red-edge index
Climate
Climate prediction
Cold
cold event
Cold waves
Damage
disturbance
Estuaries
Forests
Freezing
Geographical distribution
Geographical variations
Geography
Kandelia obovata
Low temperature
Low temperature resistance
mangrove forests
Mangrove swamps
Mangrove trees
Mangroves
Moisture content
normalized difference infrared index
Physiology
Remote sensing
Salinity
Senescence
Temperature effects
Vegetation index
Water content
Wave resistance
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Summary:Mangrove forests growing at the poleward edges of their geographic distribution are occasionally subject to freezing (0 °C) events. Cold wave effects on mangrove trees are well documented and adaptation to cold stress has been reported for local mangrove populations in the North Atlantic. However, there is less understanding of effects of cold waves on mangroves in the northern Pacific, especially at the regional scale. Moreover, it is unclear if cold tolerant mangrove species of North Asia display variation in resistance to cold temperatures across their geographic distribution. Using a cold wave event that occurred in January 2021, we evaluated the effects of low temperatures on vegetation index (VI) change (relative to a recent five-year baseline) for mangrove forests dominated by Kandelia obovata (Rhizophoraceae) and Avicennia marina (Acanthaceaee) at the northern edge of their geographical range. We used two VIs derived from Sentinel-2 imagery as indicators for canopy health: the normalized difference infrared index (NDII) and the chlorophyll red-edge index (ChlRE), which reflect forest canopy water content and chlorophyll concentration, respectively. We isolated the cold wave effects on the forest canopy from phenology (i.e., cold wave induced deviation from a five-year baseline) and used multiple linear regression to identify significant climatic predictors for the response of mangrove forest canopy VI change to low temperatures. For areas where the cold wave resulted in temperatures
ISSN:2072-4292
2072-4292
DOI:10.3390/rs13142732