Phenological monitoring of vine using MODIS imagery in the vineyard of Saumur-Angers (Loire Valley area, France) A. Thomas1, S. Corgne1, O. Planchon1, C. Bonnefoy1, H. Quenol1, L. Hubert-Moy1, & R. Lecerf2 1UMR CNRS 6554 LETG Rennes Costel, Rennes 2 University, Place du Recteur Henri Le Moal, 35043 Rennes cedex, France 2UMR 1114 Emmah INRA - UAPV, Domaine St Paul Site agroparc, 84914 Avignon Cedex 9, France Introduction Results Monitoring vineyard with very high 1.From 2000 to 2010, at site scale : resolution remotely sensed data be- I Seasonal variations visible on the vegetation coverage ratio comes more and more common, (fCOVER) graph Figure: AOC vineyard of Anjou-Saumur (AOC-SA) ; despite their low acquisition fre- I Monthly variability exists & can be associated with climatic Weather station quency. Here we emphasize the im- features : portance of high temporal resolution I Remarkably mild & wet winters of 2000-2001 & 2006-2007 ⇒ Material and Methods favourable to an increase of fCOVER to detect changes in phenology of MODIS images dataset (Nasa) I Strong & long-term rainfall deficit (until autumn) in 2005 & the vine, using underused MODIS im- I associated hydric stress ⇒ a strong decrease in fCOVER ages with moderate resolution (250- I Produced from 2000 to 2011 by a workflow described in Lecerf (2008) 500m) but available every 10 days. 2.Temporal metrics vs. phenological stages : I A regular series of cloudless images (1 image per 10 days) : I Variability in temporal metrics is higher than in phenological stages, due This study takes part of two programs which deal with global change and agricultural adaptations : I Biophysical variables (like fCOVER, vegetation to different data scales cover fraction) TERADCLIM (2011-2013) for wine makers and I 2006-2007 mild winter induces a longer period with vegetation CLIMASTER (2008-2011) about agricultural re- I Temporal metrics (beginning of growth, growth’s from 2007 to 2009, the strong pattern in temporal metrics could be sources in four administrative regions of Western maximum and senescence dates) derived from I France. biophysical variables linked with a similar but slighter pattern in phenological stages I 250m resolution Study site I Climatic data (temperature & 3.In 2010 : rainfall) : I fCOVER maps show variability linked with topography The AOC (Appellation d’Orig- Monthly data from 2000 to 2011 of Angers & I I fCOVER & its variability decrease from mid budbreak date ine Contrôlée) vineyard of Anjou- Saumur weather stations (Meteo France) to mid veraison date Saumur - AOC-SA (47 ˚13 ´ N - I Daily data from 11 weather stations set up as I Saumur area (B) is the most homogeneous part of our study 0˚26 ´ E), covers an area of 33,800 soon as 2008, with measurements every 15 minutes (Terviclim/INRA) site, and dominated by late varieties. ha in West-Central France. I Growing Degree Days (GDD, I fCover & GDD neither intercorrelated nor linked to major st Poct.31 A B apr.1st (Tm − 10) ) calculated from mean daily differences in local climate schemes (cf. A & B) temperature (Tm, in ˚c) I Phenological stages (INRA data) : Discussion Perspectives I Experimental plots of the Viticultural High-School of Montreuil Bellay I High temporal resolution of MODIS images : I Improve vineyard monitoring 4 main grape varieties : Grolleau, Gamay, I I Seasonal & monthly variability using MODIS images : Cabernet franc & Sauvignon Better to describe vine phenology at site-scale than high I I New temporal metrics to predict Phenological stages (budbreak, blooming & I Monoculture area ⇒ stronger I resolution images phenological stages veraison) dates noted when half of plants reach relationship between climate I Moderate spatial resolution of MODIS images : I Focus on climate at finer scale : the stage. Temporal metrics useful to detect effects of extreme Figure: MODIS satellite change and evolution of phenology, I I Confrontation with climatic features climatic years on vegetation based on individual weather stations I Temperature and precipitation I Sufficient to show earliness or delay in vine phenology, I Look on types of atmospheric Reference : variability ⇒ changes in linked to topography Lecerf, R. Suivi des changements d’occupation et circulations (GWL) & their d’utilisation des sols d’origine anthropique et climatique à biophysical variables I Mixture in MODIS pixels due to contiguous parcels with l’échelle régionale par télédétection moyenne résolution impacts (application à la Bretagne) - Doctoral thesis, Rennes-2 Figure: Phenological stages different grape varieties and surronding vegetation University, 2008. (budbreak, blooming & veraison) (orchards) EGU 2012, Vienna (2012/04/27) UMR CNRS 6554 LETG Rennes Costel - http://letg.univ-nantes.fr/fr/laboratoire/4/presentation [email protected].