Canopy reflectance models illustrate varying NDVI responses to change in high latitude ecosystems

Simple item page
dc.contributor.authorHuemmrich, Karl
dc.contributor.authorZesati, Sergio Vargas
dc.contributor.authorCampbell, Petya Entcheva
dc.contributor.authorTweedie, Craig
dc.date.accessioned2021-08-17T19:22:19Z
dc.date.available2021-08-17T19:22:19Z
dc.date.issued2021-08-09
dc.description.abstractMultiyear trends in Normalized Difference Vegetation Index (NDVI) have been used as metrics of high latitude ecosystem change based on the assumption that NDVI change is associated with ecological change, generally as changes in green vegetation amount (green leaf area index (LAI) or plant cover). Further, no change in NDVI is often interpreted as no change in these variables. Three canopy reflectance models including linear mixture model, the SAIL (Scattering from Arbitrarily Inclined Leaves) model, and the GeoSail model were used to simulate scenarios representing high latitude landscape NDVI responses to changes in LAI and plant cover. The simulations showed inconsistent NDVI responses. Clear increases in NDVI are generally associated with increases in LAI and plant cover. At higher values of LAI, the change in NDVI per unit change in LAI decreases, with very little change in spruce forest NDVI where crown cover is >50% and at the tundra-taiga ecotone with transitions from shrub tundra to spruce woodland. These lower responses may bias the interpretation of greening/browning trends in boreal forests. Variations in water or snow coverage were shown to produce outsized nonbiological NDVI responses. Inconsistencies in NDVI responses exemplify the need for care in the interpretation of NDVI change as a metric of high latitude ecosystem change, and that landscape characteristics in terms of the type of cover and its characteristics, such as the initial plant cover, must be taken into account in evaluating the significance of any observed NDVI trends.en_US
dc.description.sponsorshipConceptualization, software, formal analysis, and writing—original draft preparation, K.F. Huemmrich; conceptualization, writing—review and editing, S. Vargas, P. Campbell, and C. Tweedie. All authors have read and agreed to the published version of the manuscript. This work is funded by NASA grant NNX17AC58A.en_US
dc.description.urihttps://esajournals.onlinelibrary.wiley.com/doi/abs/10.1002/eap.2435en_US
dc.format.extent33 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2vn6o-vcck
dc.identifier.citationHuemmrich, Karl Fred et al.; Canopy reflectance models illustrate varying NDVI responses to change in high latitude ecosystems; Ecological Applications, 9 August, 2021; https://doi.org/10.1002/eap.2435en_US
dc.identifier.urihttps://doi.org/10.1002/eap.2435
dc.identifier.urihttp://hdl.handle.net/11603/22530
dc.language.isoen_USen_US
dc.publisherEcological Society of Americaen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsAttribution-NonCommercial 4.0 International (CC BY-NC 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.titleCanopy reflectance models illustrate varying NDVI responses to change in high latitude ecosystemsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-0505-4951en_US
dcterms.creatorhttps://orcid.org/0000-0003-4148-9108

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Ecological Applications - 2021 - Huemmrich - Canopy reflectance models illustrate varying NDVI responses to change in high.pdf
Size:
2.45 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.56 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

UMBC Joint Center for Earth Systems Technology (JCET)
UMBC Faculty Collection