Excoecaria agallocha

About: Excoecaria agallocha is a research topic. Over the lifetime, 362 publications have been published within this topic receiving 5042 citations. The topic is also known as: Gewa.

Leaf Anatomical Studies on Some Mangrove Plants

Abstract: Leaf anatomical characters of mangrove taxa namely Acanthus illicifolius, Aegiceros corniculatum, Avicennia marina, Avicennia officinalis, Bruguiera cylindrica, Ceriops decandra, Excoecaria agallocha, Lumnitzera racemosa, Rhizophora apiculata, R. mucranata, Suaeda maritima, S. monoica and Sesuvium portulacasturm were investigated. Hand sections of leaves were made at a position approximately half way between the base and apex of a sector from one side of the lamina. Petiole sections were made in the middle of the petiole and the sections were stained with aqueous safranin and mounted in glycerin jelly sealed with paraffin wax. Apart from light microscope sections, also observed under SEM microscope. The mangrove taxa showed anatomical characters which are adapted to mangrove environment even though they are from different families. With regard to epidermal characters, the mangroves of one family showed closer resemblance to the non-mangroves of the same family than to mangroves of other families. The study indicated that the epidermal characters are reliable for identification of various plant species.

Automatic identification of saline blanks and pattern of related mangrove species on hyperspectral imagery

Abstract: This research attempts to apply hyper spectral imagery to identity saline blank patterns within mixed mangrove forest of the Sunderban Bio-geographic Province of West Bengal, India. Identification of patterns of changing mangrove species around saline blanks on hyperspectral image has also been attempted. This research uses derivative analysis to identify hyperspectral wavelengths that are sensitive to the presence of minerals comprising saline blanks. These wavelengths have been considered for development of a new saline blank identification model. Spectral signatures of mangrove species endmembers have been automatically extracted using NFINDR algorithm and considered as input for spectral unmixing of saline blank and mangrove endmembers. The fractional abundance estimates of spectral unmixing applied on time series hyperspectral data of the study area indicate that, over the years, as saline blanks become more abundant in the region, the presence of mangrove species (even the salt tolerant ones) gets reduced. However, in areas where the mangrove species still dominate and saline blanks are in its formative stage, there is still a possibility of re-growth of the saline prone mangrove species. It is found that mangrove species namely, Excoecaria agallocha and Ceriops Decandra are prevalent around the saline blank areas. Others like Avicennia marina and Avicennia alba also exist in certain locations of saline blanks.