TY - JOUR
T1 - Exploring the effects of biophysical parameters on the spatial pattern of rare cold damage to mangrove forests
AU - Liu, Kai
AU - Liu, Lin
AU - Liu, Hongxing
AU - Li, Xia
AU - Wang, Shugong
PY - 2014/7
Y1 - 2014/7
N2 - In recognition of the role of mangrove forests as natural barriers and bio-shields in protecting coastal population and property in the aftermath of the 2004 Indian Ocean tsunami disaster, many Asian countries have launched various projects to restore and conserve mangrove trees. The growth and vitality condition of mangroves may be negatively influenced by various anthropogenic and natural disturbances and stresses, such as cold weather events. This paper represents the first attempt to map the cold damage to mangroves in the tropical zone of Southern China using high resolution multispectral satellite imagery. In this study, the spatial distribution of severity level of cold damage to mangroves imposed by a rare blizzard in Southern China during early 2008 has been mapped and analyzed using IKONOS image. An object-oriented classification applied to the images achieved an overall accuracy of 90.9% for classifying mangroves into three categories: undamaged, damaged, and dead. Of the total 287.30. ha of mapped mangroves, approximately 51.1% were damaged or died due to the cold stress of the blizzard. These results have been verified by more recent WorldView-II images. Furthermore, we explored the associations between the cold damage severity level of mangroves and climate and landscape factors, including elevation, surface slope, aspect, wind direction and velocity, wind shadow effect, and tree height. The surface topographical variables are derived from the ASTER Global DEM. The analysis results suggest that wind direction, terrain topography, and proximity to ocean are important local environmental factors controlling the vulnerability of mangroves to cold damage. Most damaged mangroves were located near the open sea, as a result of a possible edge exposure effect. The damage to the mangroves on the leeward side of a hill was also minimal. Such knowledge of climate and landscape controls can offer insight on how to better restore and protect the mangrove forest in the future.
AB - In recognition of the role of mangrove forests as natural barriers and bio-shields in protecting coastal population and property in the aftermath of the 2004 Indian Ocean tsunami disaster, many Asian countries have launched various projects to restore and conserve mangrove trees. The growth and vitality condition of mangroves may be negatively influenced by various anthropogenic and natural disturbances and stresses, such as cold weather events. This paper represents the first attempt to map the cold damage to mangroves in the tropical zone of Southern China using high resolution multispectral satellite imagery. In this study, the spatial distribution of severity level of cold damage to mangroves imposed by a rare blizzard in Southern China during early 2008 has been mapped and analyzed using IKONOS image. An object-oriented classification applied to the images achieved an overall accuracy of 90.9% for classifying mangroves into three categories: undamaged, damaged, and dead. Of the total 287.30. ha of mapped mangroves, approximately 51.1% were damaged or died due to the cold stress of the blizzard. These results have been verified by more recent WorldView-II images. Furthermore, we explored the associations between the cold damage severity level of mangroves and climate and landscape factors, including elevation, surface slope, aspect, wind direction and velocity, wind shadow effect, and tree height. The surface topographical variables are derived from the ASTER Global DEM. The analysis results suggest that wind direction, terrain topography, and proximity to ocean are important local environmental factors controlling the vulnerability of mangroves to cold damage. Most damaged mangroves were located near the open sea, as a result of a possible edge exposure effect. The damage to the mangroves on the leeward side of a hill was also minimal. Such knowledge of climate and landscape controls can offer insight on how to better restore and protect the mangrove forest in the future.
KW - Biophysical parameters
KW - Climate and landscape controls
KW - Cold damage
KW - IKONOS
KW - Mangroves
KW - Object-oriented classification
UR - https://www.scopus.com/pages/publications/84899941083
U2 - 10.1016/j.rse.2014.04.019
DO - 10.1016/j.rse.2014.04.019
M3 - 文章
AN - SCOPUS:84899941083
SN - 0034-4257
VL - 150
SP - 20
EP - 33
JO - Remote Sensing of Environment
JF - Remote Sensing of Environment
ER -