Profundidad óptica de la vegetación (VOD): revisión de los productos de SMAP y perspectivas para sus aplicaciones agrícolas en el sudeste de la Región Pampeana de Argentina
DOI:
https://doi.org/10.59069/83nqhd97Palavras-chave:
condición hídrica de la vegetación, cultivos, déficit hídrico, microondas pasivas, teledetecciónResumo
Las observaciones de microondas en las frecuencias entre los 1-2 GHz (banda L) son sensibles a la humedad de suelo superficial (SM) y al contenido de agua en la vegetación, el cual puede parametrizarse por medio de la profundidad óptica de la vegetación (VOD). El objetivo de este trabajo fue presentar los principios físicos de las mediciones de microondas pasivas y un análisis preliminar sobre las dinámicas hídricas de la vegetación en el sudeste de la Región Pampeana por medio de la observación de las series temporales de VOD y SM de la misión Soil Moisture Active Passive mission (SMAP). Para complementar a estos análisis, se incorporaron observaciones del índice de vegetación de diferencia normalizada (NDVI) y de la temperatura de superficie (LST) obtenidos en campo y derivados de medidas registradas por sensor Moderate-Resolution Imaging Spectroradiometer (MODIS). Los resultados mostraron que la VOD presenta capacidad para determinar variaciones subsemanales relacionadas al contenido de agua en la vegetación mediante comportamientos acoplados con la SM y la LST bajo condiciones homogéneas de superficie. Particularmente, durante las temporadas de verano se observaron que aumentos localizados de LST coincidieron con bajas de VOD. Estas observaciones demostraron el potencial de VOD tanto para el seguimiento de la dinámica hídrica de la vegetación a escala subsemanal como para la detección de eventos puntuales de estrés hídrico.
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Copyright (c) 2024 Sabrina Beninato, Mauro Ezequiel Holzman, Raúl Eduardo Rivas, Jorge Francisco Diez
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