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Decadal-scale dynamics of an Amazonian mangrove caused by climate and sea level changes: Inferences from spatial-temporal analysis and digital elevation models
被引：21
|作者：
Cohen, Marcelo C. L.
[1
]
de Souza, Adriana V.
[2
]
Rossetti, Dilce F.
[3
]
Pessenda, Luiz C. R.
[4
]
Franca, Marlon Carlos
[1
,5
]
机构：
[1] Brazil Fed Univ Para, Fed Univ Para, Grad Program Geol & Geochem, Lab Coastal Dynam, Rua Augusto Correa,01 Guama, BR-66075110 Belem, PA, Brazil
[2] Trav Benjamim Constant, 1663 Nazare, BR-66035090 Belem, PA, Brazil
[3] Natl Space Res Inst INPE, Rua Astronautas 1758,CP 515, BR-12245970 Sao Jose Dos Campos, SP, Brazil
[4] Univ Sao Paulo, CENA Lab 14C, Av Centenario 303, BR-13400000 Piracicaba, SP, Brazil
[5] Fed Inst Para, Av Alm Barroso 1155, BR-66090020 Belem, PA, Brazil
关键词：
Braganca mangrove;
sea level;
rainfall;
digital elevation model;
BRUGUIERA-PARVIFLORA;
L AVICENNIACEAE;
ORGANIC-CARBON;
NORTH BRAZIL;
SALINITY;
BRAGANCA;
FORESTS;
SALT;
ACCUMULATION;
NITROGEN;
D O I：
10.1002/esp.4440
中图分类号：
P9 [自然地理学];
学科分类号：
0705 ;
070501 ;
摘要：
Sea level rise and climate change are major forces driving wetland dynamics. The northern Brazilian coast has one of the largest continuous mangrove areas on Earth, with the mangroves from the Braganca Peninsula, in eastern Amazonia, being the most representative ones. These mangroves have migrated into higher tidal flats over recent years. We analyzed spatial-temporal changes of vegetation units adapted to different physical-chemical conditions along the Braganca Peninsula in order to decipher possible causes responsible for such recent mangrove dynamics. The investigation was based on time series analysis of a 33-year (1984-2017) database consisting of satellite and drone images. These data were combined with digital elevation models based on topographical data obtained by photogrammetry, theodolite and hydrotopographic devices. During this time frame, mangroves invaded 2.7km(2) of inner tidal flats, which is compatible with a rise in relative sea level (RSL) and with a rainfall decreasing. Such topography-dependent dynamic suggests that an increased frequency of tidal inundation decreased porewater salinity and caused mangroves to expand into topographically higher grounds. However, the study area contains small basins, that are less affected by tidal inundation, and Avicennia trees are dying in these locations due to increased porewater salinity, probably caused by a decreased rainfall. We propose that climate and RSL are responsible for driving the death of mangroves in the study area, and their migration into the topographically highest tidal flats. Assuming a RSL rise of 5mm/yr under stable rainfall, or a RSL rise of 3mm/yr accompanied by decreased rainfall, it is projected that mangrove areas will expand by 2.93 or 1.35km(2), respectively, by the end of this century. The combination of photogrammetry with theodolite/hydrotopographic surveying proved to be an efficient and innovative process for monitoring and evaluating the impacts of global changes on mangroves. (c) 2018 John Wiley & Sons, Ltd.
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页码：2876 / 2888
页数：13
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