Temporal Changes in Coupled Vegetation Phenology and Productivity are Biome-Specific in the Northern Hemisphere

Global warming has greatly stimulated vegetation growth through both extending the growing season and promoting photosynthesis in the Northern Hemisphere (NH). Analyzing the combined dynamics of such trends can potentially improve our current understanding on changes in vegetation functioning and the complex relationship between anthropogenic and climatic drivers. This study aims to analyze the relationships (long-term trends and correlations) of length of vegetation growing season (LOS) and vegetation productivity assessed by the growing season NDVI integral (GSI) in the NH (>30°N) to study any dependency of major biomes that are characterized by different imprint from anthropogenic influence. Spatial patterns of converging/diverging trends in LOS and GSI and temporal changes in the coupling between LOS and GSI are analyzed for major biomes at hemispheric and continental scales from the third generation Global Inventory Monitoring and Modeling Studies (GIMMS) Normalized Difference Vegetation Index (NDVI) dataset for a 32-year period (1982–2013). A quarter area of the NH is covered by converging trends (consistent significant trends in LOS and GSI), whereas diverging trends (opposing significant trends in LOS and GSI) cover about 6% of the region. Diverging trends are observed mainly in high latitudes and arid/semi-arid areas of non-forest biomes (shrublands, savannas, and grasslands), whereas forest biomes and croplands are primarily characterized by converging trends. The study shows spatially-distinct and biome-specific patterns between the continental land masses of Eurasia (EA) and North America (NA). Finally, areas of high positive correlation between LOS and GSI showed to increase during the period of analysis, with areas of significant positive trends in correlation being more widespread in NA as compared to EA. The temporal changes in the coupled vegetation phenology and productivity suggest complex relationships and interactions that are induced by both ongoing climate change and increasingly intensive human disturbances.

[1]  P. Blanken,et al.  Joint control of terrestrial gross primary productivity by plant phenology and physiology , 2015, Proceedings of the National Academy of Sciences.

[2]  Philippe Ciais,et al.  Evidence for a weakening relationship between interannual temperature variability and northern vegetation activity , 2014, Nature Communications.

[3]  P. Ciais,et al.  Spatiotemporal patterns of terrestrial carbon cycle during the 20th century , 2009 .

[4]  Hans Peter Schmid,et al.  Evidence of increased net ecosystem productivity associated with a longer vegetated season in a deciduous forest in south‐central Indiana, USA , 2010 .

[5]  Elia A. Machado,et al.  Seasonal trend analysis of image time series , 2009 .

[6]  S. Sweet,et al.  Greater deciduous shrub abundance extends tundra peak season and increases modeled net CO2 uptake , 2015, Global change biology.

[7]  Chun Chen,et al.  Spatial and Temporal Changes in Vegetation Phenology at Middle and High Latitudes of the Northern Hemisphere over the Past Three Decades , 2015, Remote. Sens..

[8]  C. Tucker,et al.  Northern hemisphere photosynthetic trends 1982–99 , 2003 .

[9]  Miaogen Shen,et al.  Changes in autumn vegetation dormancy onset date and the climate controls across temperate ecosystems in China from 1982 to 2010 , 2015, Global change biology.

[10]  Per Jönsson,et al.  Seasonality extraction by function fitting to time-series of satellite sensor data , 2002, IEEE Trans. Geosci. Remote. Sens..

[11]  C. Tucker,et al.  A large carbon sink in the woody biomass of Northern forests , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[12]  P. Ciais,et al.  Has the advancing onset of spring vegetation green‐up slowed down or changed abruptly over the last three decades? , 2015 .

[13]  C. A. Mücher,et al.  Strong contribution of autumn phenology to changes in satellite‐derived growing season length estimates across Europe (1982–2011) , 2014, Global change biology.

[14]  Christopher B. Field,et al.  Increases in early season ecosystem uptake explain recent changes in the seasonal cycle of atmospheric CO2 at high northern latitudes , 1999 .

[15]  Ranga B. Myneni,et al.  Changes in growing season duration and productivity of northern vegetation inferred from long-term remote sensing data , 2016 .

[16]  Philippe Ciais,et al.  Dominant role of plant physiology in trend and variability of gross primary productivity in North America , 2017, Scientific Reports.

[17]  P. Ciais,et al.  Effect of climate and CO2 changes on the greening of the Northern Hemisphere over the past two decades , 2006 .

[18]  Jan Verbesselt,et al.  Revealing turning points in ecosystem functioning over the Northern Eurasian agricultural frontier , 2016, Global change biology.

[19]  Rasmus Fensholt,et al.  Global-scale mapping of changes in ecosystem functioning from earth observation-based trends in total and recurrent vegetation , 2015 .

[20]  J. Peñuelas,et al.  Responses to a Warming World , 2001, Science.

[21]  Per Jönsson,et al.  TIMESAT - a program for analyzing time-series of satellite sensor data , 2004, Comput. Geosci..

[22]  Eike Luedeling,et al.  Winter and spring warming result in delayed spring phenology on the Tibetan Plateau , 2010, Proceedings of the National Academy of Sciences.

[23]  A. Arneth,et al.  Assimilation exceeds respiration sensitivity to drought: A FLUXNET synthesis , 2010 .

[24]  S. Piao,et al.  Changes in vegetation net primary productivity from 1982 to 1999 in China , 2005 .

[25]  Ke Zhang,et al.  Satellite detection of increasing Northern Hemisphere non-frozen seasons from 1979 to 2008: Implications for regional vegetation growth , 2012 .

[26]  P. Ciais,et al.  Europe-wide reduction in primary productivity caused by the heat and drought in 2003 , 2005, Nature.

[27]  C. Tucker,et al.  Increased plant growth in the northern high latitudes from 1981 to 1991 , 1997, Nature.

[28]  S. Leblanc,et al.  Decoupling between Plant Productivity and Growing Season Length under a Warming Climate in Canada’s Arctic , 2016 .

[29]  Rasmus Fensholt,et al.  Estimation of diurnal air temperature using MSG SEVIRI data in West Africa , 2007 .

[30]  Josep Peñuelas,et al.  Phenology Feedbacks on Climate Change , 2009, Science.

[31]  O. Sonnentag,et al.  Climate change, phenology, and phenological control of vegetation feedbacks to the climate system , 2013 .

[32]  J. Canadell,et al.  Can we reconcile atmospheric estimates of the Northern terrestrial carbon sink with land-based accounting? , 2010 .

[33]  Markus Reichstein,et al.  CO2 balance of boreal, temperate, and tropical forests derived from a global database , 2007 .

[34]  John S. Kimball,et al.  Satellite radar remote sensing of seasonal growing seasons for boreal and subalpine evergreen forests. , 2004 .

[35]  G. Henebry,et al.  Climate and environmental change in arid Central Asia: impacts, vulnerability, and adaptations. , 2009 .

[36]  P. Ciais,et al.  Carbon accumulation in European forests , 2008 .

[37]  B. Holben.  Characteristics of maximum-value composite images from temporal AVHRR data , 1986 .

[38]  I. C. Prentice,et al.  Climatic Control of the High-Latitude Vegetation Greening Trend and Pinatubo Effect , 2002, Science.

[39]  C. Tucker,et al.  Response of terrestrial ecosystems to recent Northern Hemispheric drought , 2005 .

[40]  Rob J Hyndman,et al.  Detecting trend and seasonal changes in satellite image time series , 2010 .

[41]  Philippe Ciais,et al.  Growing season extension and its impact on terrestrial carbon cycle in the Northern Hemisphere over the past 2 decades , 2007 .

[42]  P. Ciais,et al.  Changes in satellite‐derived vegetation growth trend in temperate and boreal Eurasia from 1982 to 2006 , 2011 .

[43]  S. Bruin,et al.  Trend changes in global greening and browning: contribution of short‐term trends to longer‐term change , 2012 .

[44]  Yanhong Tang,et al.  Altitude and temperature dependence of change in the spring vegetation green-up date from 1982 to 2006 in the Qinghai-Xizang Plateau , 2011 .

[45]  C. Tucker,et al.  Higher northern latitude normalized difference vegetation index and growing season trends from 1982 to 1999 , 2001, International journal of biometeorology.

[46]  Christopher B. Field,et al.  Protecting climate with forests , 2008 .

[47]  P. Ciais,et al.  Leaf onset in the northern hemisphere triggered by daytime temperature , 2015, Nature Communications.

[48]  R. Fensholt,et al.  Evaluation of Earth Observation based global long term vegetation trends — Comparing GIMMS and MODIS global NDVI time series , 2012 .

[49]  B. Sohn,et al.  Recent trends in changes of vegetation over East Asia coupled with temperature and rainfall variations , 2010 .

[50]  Xiangming Xiao,et al.  Spatial analysis of growing season length control over net ecosystem exchange , 2005 .

[51]  P. Ciais,et al.  Influence of spring and autumn phenological transitions on forest ecosystem productivity , 2010, Philosophical Transactions of the Royal Society B: Biological Sciences.

[52]  Pete Smith,et al.  Europe's Terrestrial Biosphere Absorbs 7 to 12% of European Anthropogenic CO2 Emissions , 2003, Science.

[53]  Howard E. Epstein,et al.  Recent changes in phenology over the northern high latitudes detected from multi-satellite data , 2011 .

[54]  C. Tucker,et al.  Climate-Driven Increases in Global Terrestrial Net Primary Production from 1982 to 1999 , 2003, Science.

[55]  R. B. Jackson,et al.  Biophysical considerations in forestry for climate protection , 2011 .

[56]  D. Hollinger,et al.  Influence of spring phenology on seasonal and annual carbon balance in two contrasting New England forests. , 2009, Tree physiology.

[57]  Christian Bernhofer,et al.  Relating tree phenology with annual carbon fluxes at Tharandt forest , 2005 .

[58]  T. A. Black,et al.  Interannual variability of net carbon exchange is related to the lag between the end-dates of net carbon uptake and photosynthesis: Evidence from long records at two contrasting forest stands , 2012 .

[59]  P. Ciais,et al.  Net carbon dioxide losses of northern ecosystems in response to autumn warming , 2008, Nature.

[60]  Rasmus Fensholt,et al.  Greenness in semi-arid areas across the globe 1981–2007 — an Earth Observing Satellite based analysis of trends and drivers , 2012 .

[61]  Chaoyang Wu,et al.  Land surface phenology of China's temperate ecosystems over 1999–2013: Spatial–temporal patterns, interaction effects, covariation with climate and implications for productivity , 2016 .

[62]  Y. Xue,et al.  Terrestrial biosphere models need better representation of vegetation phenology: results from the North American Carbon Program Site Synthesis , 2012 .

[63]  Maosheng Zhao,et al.  Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009 , 2010, Science.

[64]  Compton J. Tucker,et al.  A Non-Stationary 1981-2012 AVHRR NDVI3g Time Series , 2014, Remote. Sens..

[65]  Rasmus Fensholt,et al.  Drought footprint on European ecosystems between 1999 and 2010 assessed by remotely sensed vegetation phenology and productivity , 2014, Global change biology.

[66]  Andrew E. Suyker,et al.  Interannual and spatial impacts of phenological transitions, growing season length, and spring and autumn temperatures on carbon sequestration: A North America flux data synthesis , 2012 .

[67]  F. Woodward,et al.  Dynamic responses of terrestrial ecosystem carbon cycling to global climate change , 1998, Nature.

[68]  Chang-Hoi Ho,et al.  Phenology shifts at start vs. end of growing season in temperate vegetation over the Northern Hemisphere for the period 1982–2008 , 2011 .

[69]  Philippe Ciais,et al.  Large‐scale variations in the vegetation growing season and annual cycle of atmospheric CO2 at high northern latitudes from 1950 to 2011 , 2013, Global change biology.

[70]  P. Ciais,et al.  Asymmetric effects of daytime and night-time warming on Northern Hemisphere vegetation , 2013, Nature.

[71]  G. Henebry,et al.  Using multiple remote sensing perspectives to identify and attribute land surface dynamics in Central Asia 2001–2013 , 2015 .

[72]  P. Ciais,et al.  Variations in satellite‐derived phenology in China's temperate vegetation , 2006 .

[73]  I. Wing,et al.  Net carbon uptake has increased through warming-induced changes in temperate forest phenology , 2014 .

[74]  P. Ciais,et al.  Seasonally different response of photosynthetic activity to daytime and night‐time warming in the Northern Hemisphere , 2015, Global change biology.

[75]  Niels Otto Jensen,et al.  Increasing net CO2 uptake by a Danish beech forest during the period from 1996 to 2009 , 2011 .

[76]  P. Ciais,et al.  Spring temperature change and its implication in the change of vegetation growth in North America from 1982 to 2006 , 2011, Proceedings of the National Academy of Sciences.

[77]  C. Tucker,et al.  Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999 , 2001 .