NDVI Values Suggest Immediate Responses to Fire in an Uneven-Aged Mixed Forest Stand
نویسندگان
چکیده
Fire modifies vegetation dynamics in terrestrial ecosystems. Abundant literature has studied the post-fire effects with satellite sensors; however, relatively fewer studies have used unmanned aerial vehicles (UAVs) to assess of greenness prior and immediately following prescribed fires. Using multispectral sensors mounted on UAVs, we documented results normalized difference index (NDVI) as a proxy for pre- natural forest stand northern Mexico. spectral reflectance techniques statistical analyses Kruskal–Wallis pairwise Wilcoxon rank-sum tests, statistically significant differences were found NDVI values, measured before after controlled burning (p < 0.05). The showed an increase “greenness” from 0.57 0.65. This was interpreted immediate change activity canopy, which could be attributable stimulus heat stress. Complementary indices also reinforce our findings; recognize that further research is required, instance, address timing image capture. Our findings demonstrate potential some challenges associated use UAVs monitor fires, while suggesting need more detailed physiological phenological studies. High spatial resolution maps represent valuable starting point subsequent temporal monitoring contribute knowledge fire at fine resolutions.
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ژورنال
عنوان ژورنال: Forests
سال: 2022
ISSN: ['1999-4907']
DOI: https://doi.org/10.3390/f13111901