globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13200
论文题名:
Satellite chlorophyll fluorescence measurements reveal large-scale decoupling of photosynthesis and greenness dynamics in boreal evergreen forests
作者: Walther S.; Voigt M.; Thum T.; Gonsamo A.; Zhang Y.; Köhler P.; Jung M.; Varlagin A.; Guanter L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:9
起始页码: 2979
结束页码: 2996
语种: 英语
英文关键词: boreal evergreen forests ; light-use efficiency ; model GPP ; phenology ; photosynthesis ; satellite sun-induced chlorophyll fluorescence ; spring recovery ; vegetation greenness index
Scopus关键词: biomass ; boreal forest ; carbon cycle ; deciduous forest ; evergreen forest ; forest ecosystem ; GOME ; light use efficiency ; net primary production ; phenology ; photosynthesis ; vegetation index
英文摘要: Mid-to-high latitude forests play an important role in the terrestrial carbon cycle, but the representation of photosynthesis in boreal forests by current modelling and observational methods is still challenging. In particular, the applicability of existing satellite-based proxies of greenness to indicate photosynthetic activity is hindered by small annual changes in green biomass of the often evergreen tree population and by the confounding effects of background materials such as snow. As an alternative, satellite measurements of sun-induced chlorophyll fluorescence (SIF) can be used as a direct proxy of photosynthetic activity. In this study, the start and end of the photosynthetically active season of the main boreal forests are analysed using spaceborne SIF measurements retrieved from the GOME-2 instrument and compared to that of green biomass, proxied by vegetation indices including the Enhanced Vegetation Index (EVI) derived from MODIS data. We find that photosynthesis and greenness show a similar seasonality in deciduous forests. In high-latitude evergreen needleleaf forests, however, the length of the photosynthetically active period indicated by SIF is up to 6 weeks longer than the green biomass changing period proxied by EVI, with SIF showing a start-of-season of approximately 1 month earlier than EVI. On average, the photosynthetic spring recovery as signalled by SIF occurs as soon as air temperatures exceed the freezing point (2–3 °C) and when the snow on the ground has not yet completely melted. These findings are supported by model data of gross primary production and a number of other studies which evaluated in situ observations of CO2 fluxes, meteorology and the physiological state of the needles. Our results demonstrate the sensitivity of space-based SIF measurements to light-use efficiency of boreal forests and their potential for an unbiased detection of photosynthetic activity even under the challenging conditions interposed by evergreen boreal ecosystems. © 2015 John Wiley & Sons Ltd
资助项目: The MODIS MCD43C4 v005 and MCD12C1 v051 data products were retrieved from the online Reverb tool, courtesy of the NASA EOSDIS Land Processes Distributed Active Archive Center (LP DAAC), USGS/Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota, https://lpdaac.usgs.gov/dataset_discovery/modis/modis_products_table. The work by S. Walther, M. Voigt, P. Köhler and Y. Zhang was funded by the Emmy Noether Programme (GlobFluo project) of the German Research Foundation. The work of T. Thum was funded by the Academy of Finland with grant number 266803. Work by A. Varlagin was funded also by the Russian Science Foundation grant number 14-27-00065. We sincerely thank three anonymous reviewers for their valueable and thoughtful comments that helped improve this manuscript. The authors declare no conflict of interest.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61320
Appears in Collections:影响、适应和脆弱性

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作者单位: Section 1.4 Remote Sensing, GFZ German Research Centre for Geosciences, Helmholtz-Centre Potsdam, Potsdam, Germany; Max-Planck-Institute for Biogeochemistry, Jena, Germany; Finnish Meteorological Institute, Helsinki, Finland; Department of Geography, University of Toronto, Toronto, ON, Canada; International Institute for Earth System Sciences, Nanjing University, Nanjing, China; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russian Federation

Recommended Citation:
Walther S.,Voigt M.,Thum T.,et al. Satellite chlorophyll fluorescence measurements reveal large-scale decoupling of photosynthesis and greenness dynamics in boreal evergreen forests[J]. Global Change Biology,2016-01-01,22(9)
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