Abstract

ALLIN-CANAS, Mayra Alejandra; SUAREZ-GOMEZ, July Andrea; TORO-RESTREPO, Luis Jairo  and  RUEDA-TRUJILLO, Manuela Andrea. Vegetation indices for Pontederia crassipes Pellegrini & Horn and multitemporal distribution in the Hydroituango reservoir. Dyna rev.fac.nac.minas [online]. 2022, vol.89, n.223, pp.36-45.  Epub Nov 09, 2022. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v89n223.99137.

Pontederia crassipes Pellegrini & Horn (water hyacinth) is an invasive, world-wide distributed aquatic plant, which has been evinced in the reservoir of the Ituango Hydroelectric Project - IHP (Colombia) since 2018. In this study, the ability of several Vegetation Indices (VIs) to detect P. crassipes was evaluated based on monthly Sentinel-2 images, between September 2018 and March 2020. The invasive capacity of P. crassipes was demonstrated with covered area doubling each month in the IHP reservoir. A maximum 32-fold increase of P. crassipes in just one month was registered during the rainy season and resulted in a 104-ha expansion. Results based on Cl red edge, MSR, and DVI were consistent and had less deviations from normality. Our results highlight the importance of new-generation sensors to discriminate and map the spatial distribution of P. crassipes for the development of efficient monitoring and management strategies at the reservoir scale.

Keywords : precipitation; Sentinel-2; spread rate; timely detection; vegetation indices; water hyacinth.

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