Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers

Despite conservation efforts in the U.S. Great Plains, woody species have continued to expand at an unprecedented rate, threatening key ecosystem services and resilience. Cross-scale monitoring of these grasslands is key to successful integrative management strategies. In this study we measured plan...

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Autores principales:	Anastasios Mazis, Julie A. Fowler, Jeremy Hiller, Yuzhen Zhou, Brian D. Wardlow, David Wedin, Tala Awada
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Woody plant invasion Herbaceous vegetation Chlorophyll Fluorescence Biomass Vegetation indices Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/fdcfbbcf4f1f480eaab2aca4154b91c0
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spelling	oai:doaj.org-article:fdcfbbcf4f1f480eaab2aca4154b91c02021-12-01T04:59:49ZEcophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers1470-160X10.1016/j.ecolind.2021.108159https://doaj.org/article/fdcfbbcf4f1f480eaab2aca4154b91c02021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21008244https://doaj.org/toc/1470-160XDespite conservation efforts in the U.S. Great Plains, woody species have continued to expand at an unprecedented rate, threatening key ecosystem services and resilience. Cross-scale monitoring of these grasslands is key to successful integrative management strategies. In this study we measured plant optical traits derived from hyperspectral proximal sensing techniques with a field spectrometer, coupled with field-based measurements, including fluorescence and chlorophyll content, to determine the impacts of Juniperus virginiana and Pinus ponderosa expansion on grasslands health in Nebraska Sandhills, and investigated the use of optical-based approaches as indicators of successful monitoring of grasslands. Our results showed that higher woody species cover in grasslands was associated with lower soil moisture, decline in forbs, shrubs, and grasses cover and productivity, as well as herbaceous chlorophyll content and fluorescence, compared to non-invaded grasslands. We derived 13 vegetation indices (VIs) from optical-based methods and validated them against traditional handheld measurements of plant ecophysiological traits and vegetation biomass and composition. VIs, including Normalized Difference Vegetation Index (NDVI), Water Index (WI) and Chlorophyll Index at red edge (CIred edge) performed best when tested against biomass, and chlorophyll content and fluorescence (Fv/Fm), suggesting their potential use for assessing grasslands vegetation health. We demonstrate that optical-based approaches can serve as efficient non-invasive tools that can be part of multi-scale successful integrative management strategies.Anastasios MazisJulie A. FowlerJeremy HillerYuzhen ZhouBrian D. WardlowDavid WedinTala AwadaElsevierarticleWoody plant invasionHerbaceous vegetationChlorophyllFluorescenceBiomassVegetation indicesEcologyQH540-549.5ENEcological Indicators, Vol 131, Iss , Pp 108159- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Woody plant invasion Herbaceous vegetation Chlorophyll Fluorescence Biomass Vegetation indices Ecology QH540-549.5
spellingShingle	Woody plant invasion Herbaceous vegetation Chlorophyll Fluorescence Biomass Vegetation indices Ecology QH540-549.5 Anastasios Mazis Julie A. Fowler Jeremy Hiller Yuzhen Zhou Brian D. Wardlow David Wedin Tala Awada Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers
description	Despite conservation efforts in the U.S. Great Plains, woody species have continued to expand at an unprecedented rate, threatening key ecosystem services and resilience. Cross-scale monitoring of these grasslands is key to successful integrative management strategies. In this study we measured plant optical traits derived from hyperspectral proximal sensing techniques with a field spectrometer, coupled with field-based measurements, including fluorescence and chlorophyll content, to determine the impacts of Juniperus virginiana and Pinus ponderosa expansion on grasslands health in Nebraska Sandhills, and investigated the use of optical-based approaches as indicators of successful monitoring of grasslands. Our results showed that higher woody species cover in grasslands was associated with lower soil moisture, decline in forbs, shrubs, and grasses cover and productivity, as well as herbaceous chlorophyll content and fluorescence, compared to non-invaded grasslands. We derived 13 vegetation indices (VIs) from optical-based methods and validated them against traditional handheld measurements of plant ecophysiological traits and vegetation biomass and composition. VIs, including Normalized Difference Vegetation Index (NDVI), Water Index (WI) and Chlorophyll Index at red edge (CIred edge) performed best when tested against biomass, and chlorophyll content and fluorescence (Fv/Fm), suggesting their potential use for assessing grasslands vegetation health. We demonstrate that optical-based approaches can serve as efficient non-invasive tools that can be part of multi-scale successful integrative management strategies.
format	article
author	Anastasios Mazis Julie A. Fowler Jeremy Hiller Yuzhen Zhou Brian D. Wardlow David Wedin Tala Awada
author_facet	Anastasios Mazis Julie A. Fowler Jeremy Hiller Yuzhen Zhou Brian D. Wardlow David Wedin Tala Awada
author_sort	Anastasios Mazis
title	Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers
title_short	Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers
title_full	Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers
title_fullStr	Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers
title_full_unstemmed	Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers
title_sort	ecophysio-optical traits of semiarid nebraska grasslands under different juniperus virginiana and pinus ponderosa canopy covers
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/fdcfbbcf4f1f480eaab2aca4154b91c0
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Ecophysio-optical traits of semiarid Nebraska grasslands under different Juniperus virginiana and Pinus ponderosa canopy covers

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