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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/
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 (R531 − R570)/(R531 − R570)) 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. ÄPRI and Ä(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: | 293 View Download Statistics |
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