Influence of spring and autumn phenological transitions on forest ecosystem productivity
Andrew D. Richardson,T. Andy Black,Philippe Ciais,Nicolas Delbart,Mark A. Friedl,Nadine Gobron,David Y. Hollinger,Werner L. Kutsch,Bernard Longdoz,Sebastiaan Luyssaert,Sebastiaan Luyssaert,Mirco Migliavacca,Leonardo Montagnani,Leonardo Montagnani,J. William Munger,Eddy Moors,Shilong Piao,Corinna Rebmann,Markus Reichstein,Nobuko Saigusa,Enrico Tomelleri,Rodrigo Vargas,Andrej Varlagin +22 more
TLDR
Investigation of relationships between phenology and productivity in temperate and boreal forests finds the productivity of evergreen needleleaf forests is less sensitive to phenology than is productivity of deciduous broadleaf forests, which has implications for how climate change may drive shifts in competition within mixed-species stands.Abstract:
We use eddy covariance measurements of net ecosystem productivity (NEP) from 21 FLUXNET sites (153 site-years of data) to investigate relationships between phenology and productivity (in terms of both NEP and gross ecosystem photosynthesis, GEP) in temperate and boreal forests. Results are used to evaluate the plausibility of four different conceptual models. Phenological indicators were derived from the eddy covariance time series, and from remote sensing and models. We examine spatial patterns (across sites) and temporal patterns (across years); an important conclusion is that it is likely that neither of these accurately represents how productivity will respond to future phenological shifts resulting from ongoing climate change. In spring and autumn, increased GEP resulting from an 'extra' day tends to be offset by concurrent, but smaller, increases in ecosystem respiration, and thus the effect on NEP is still positive. Spring productivity anomalies appear to have carry-over effects that translate to productivity anomalies in the following autumn, but it is not clear that these result directly from phenological anomalies. Finally, the productivity of evergreen needleleaf forests is less sensitive to phenology than is productivity of deciduous broadleaf forests. This has implications for how climate change may drive shifts in competition within mixed-species stands.read more
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Terrestrial carbon cycle affected by non-uniform climate warming
Jianyang Xia,Jiquan Chen,Jiquan Chen,Shilong Piao,Shilong Piao,Philippe Ciais,Yiqi Luo,Shiqiang Wan +7 more
TL;DR: In this article, a synthesis of global air temperature data reveals non-uniform rates of climate warming on diurnal and seasonal timescales, and heterogeneous impacts on ecosystem carbon cycling.
Journal ArticleDOI
Landscape controls on the timing of spring, autumn, and growing season length in mid‐Atlantic forests
TL;DR: In this paper, the influence of climate-related landscape factors on the timing of spring and autumn leaf-area trajectories in mid-Atlantic, USA forests was explored using nonlinear inverse modeling of medium-resolution remote sensing data organized by day of year.
Journal ArticleDOI
Forecasting phenology: from species variability to community patterns.
Jeffrey M. Diez,Inés Ibáñez,Abraham J. Miller-Rushing,Susan J. Mazer,Theresa M. Crimmins,Michael A. Crimmins,C. David Bertelsen,David W. Inouye,David W. Inouye +8 more
TL;DR: It is shown how despite significant variation among species in sensitivities to climate, comparable patterns emerge at the community level once regional climate drivers are accounted for and explicit consideration of spatial scale and levels of biological organisation may help to understand and forecast phenological responses to climate change.
Journal ArticleDOI
Using digital repeat photography and eddy covariance data to model grassland phenology and photosynthetic CO2 uptake
Mirco Migliavacca,Marta Galvagno,Edoardo Cremonese,Micol Rossini,Michele Meroni,Oliver Sonnentag,Sergio Cogliati,Giovanni Manca,Fabrizio Diotri,Lorenzo Busetto,Alessandro Cescatti,Roberto Colombo,Francesco Fava,Francesco Fava,Umberto Morra di Cella,Emiliano Pari,Consolata Siniscalco,Andrew D. Richardson +17 more
TL;DR: In this article, the authors evaluated the applicability of digital camera imagery for monitoring and modeling phenology and physiology of a subalpine grassland over the 2009 and 2010 growing seasons.
Journal ArticleDOI
Changes in autumn senescence in northern hemisphere deciduous trees: a meta-analysis of autumn phenology studies
Allison L. Gill,Amanda S. Gallinat,Rebecca Sanders-DeMott,Angela J. Rigden,Daniel J. Short Gianotti,J. Mantooth,Pamela H. Templer +6 more
TL;DR: The results indicate that leaf senescence has been delayed over time and in response to temperature, although low-latitude sites show significantly stronger delays insenescence over time than high-latitudes sites.
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