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Relation of chlorophyll fluorescence sensitive reflectance ratios to carbon flux measurements of montanne grassland and norway spruce forest ecosystems in the temperate zone

Citation

Ac, A and Malenovsky, Z and Urban, O and Hanus, J and Zitova, M and Navratil, M and Vrablova, M and Olejnickova, J and Spunda, V and Marek, M, Relation of chlorophyll fluorescence sensitive reflectance ratios to carbon flux measurements of montanne grassland and norway spruce forest ecosystems in the temperate zone, The Scientific World Journal, 2012 Article 705872. ISSN 1537-744X (2012) [Refereed Article]


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Licensed under the Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.1100/2012/705872

Abstract

We explored ability of reflectance vegetation indexes (VIs) related to chlorophyll fluorescence emission (R686/R630, R740/R>800) and de-epoxidation state of xanthophyll cycle pigments (PRI, calculated as (R531R570)/(R531R570)) to track changes in the CO2 assimilation rate and Light Use Efficiency (LUE) in montane grassland and Norway spruce forest ecosystems, both at leaf and also canopy level. VIs were measured at two research plots using a ground-based high spatial/spectral resolution imaging spectroscopy technique. No significant relationship between VIs and leaf light-saturated CO2 assimilation (AMAX) was detected in instantaneous measurements of grassland under steady-state irradiance conditions. Once the temporal dimension and daily irradiance variation were included into the experimental setup, statistically significant changes in VIs related to tested physiological parameters were revealed. ─PRI and ─(R686/R630) of grassland plant leaves under dark-to-full sunlight transition in the scale of minutes were significantly related to AMAX (R2 = 0.51). In the daily course, the variation of VIs measured in one-hour intervals correlated well with the variation of Gross Primary Production (GPP), Net Ecosystem Exchange (NEE), and LUE estimated via the eddy-covariance flux tower. Statistical results were weaker in the case of the grassland ecosystem, with the strongest statistical relation of the index R686/R630 with NEE and GPP.

Item Details

Item Type:Refereed Article
Keywords:reflectance vegetation index, chlorophyll fluorescence emission, xanthophyll cycle pigments, spectroscopy, light use efficiency, LUE, gross primary production, GPP, net ecosystem exchange, NEE
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecology not elsewhere classified
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Mountain and High Country Environments
Author:Malenovsky, Z (Dr Zbynek Malenovsky)
ID Code:78714
Year Published:2012
Deposited By:Geography and Environmental Studies
Deposited On:2012-07-23
Last Modified:2013-04-30
Downloads:287 View Download Statistics

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