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Featured researches published by Joao. A. Santos.


PLOS ONE | 2014

Integrated Analysis of Climate, Soil, Topography and Vegetative Growth in Iberian Viticultural Regions

Helder Fraga; Aureliano C. Malheiro; José Moutinho-Pereira; Rita M. Cardoso; Pedro M. M. Soares; J.J. Cancela; Joaquim G. Pinto; Joao. A. Santos

The Iberian viticultural regions are convened according to the Denomination of Origin (DO) and present different climates, soils, topography and management practices. All these elements influence the vegetative growth of different varieties throughout the peninsula, and are tied to grape quality and wine type. In the current study, an integrated analysis of climate, soil, topography and vegetative growth was performed for the Iberian DO regions, using state-of-the-art datasets. For climatic assessment, a categorized index, accounting for phenological/thermal development, water availability and grape ripening conditions was computed. Soil textural classes were established to distinguish soil types. Elevation and aspect (orientation) were also taken into account, as the leading topographic elements. A spectral vegetation index was used to assess grapevine vegetative growth and an integrated analysis of all variables was performed. The results showed that the integrated climate-soil-topography influence on vine performance is evident. Most Iberian vineyards are grown in temperate dry climates with loamy soils, presenting low vegetative growth. Vineyards in temperate humid conditions tend to show higher vegetative growth. Conversely, in cooler/warmer climates, lower vigour vineyards prevail and other factors, such as soil type and precipitation acquire more important roles in driving vigour. Vines in prevailing loamy soils are grown over a wide climatic diversity, suggesting that precipitation is the primary factor influencing vigour. The present assessment of terroir characteristics allows direct comparison among wine regions and may have great value to viticulturists, particularly under a changing climate.


E3S Web of Conferences | 2018

Climate change impacts on thermal growing conditions of Portuguese grapevine varieties

Joao. A. Santos; Ricardo Costa; Helder Fraga


E3S Web of Conferences | 2018

Modelling the Terroir of the Douro Demarcated Region, Portugal

Helder Fraga; Ricardo Costa; Joao. A. Santos


Berichte aus dem Julius Kühn-Institut | 2016

Assessment of optimal N fertilizer use on Portuguese maize yield using the STICS crop model

Chenyao Yang; Helder Fraga; Wim van Leperen; Joao. A. Santos


Berichte aus dem Julius Kühn-Institut | 2016

Modeling climate change impacts on nitrogen stress for the Portuguese viticulture

Helder Fraga; Aureliano C. Malheiro; Joao. A. Santos


Berichte aus dem Julius Kühn-Institut | 2016

Influences of climate change on agri-forestry systems

Joao. A. Santos; Helder Fraga; Ricardo Costa; Chenyao Yang


Archive | 2010

On the development and persistance of strong ridge episodes over the eastern North Atlantic

Joao. A. Santos; Joaquim G. Pinto; Uwe Ulbrich; Tim Woollings


Archive | 2010

Future scenarios for viticultural bioclimatic indices in Europe

Joao. A. Santos; Aureliano C. Malheiro; Helder Fraga; Joaquim G. Pinto


Archive | 2009

Development of strong and persistent ridge episodes in the Eastern North Atlantic

Joao. A. Santos; Joaquim G. Pinto; Uwe Ulbrich


Archive | 2009

Inter-annual climate variability and productivity models for grapevines in Portugal

M. Martinho; Joao. A. Santos; Aureliano C. Malheiro; Joaquim G. Pinto

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Helder Fraga

University of Trás-os-Montes and Alto Douro

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Joaquim G. Pinto

Karlsruhe Institute of Technology

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Uwe Ulbrich

Free University of Berlin

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José Moutinho-Pereira

University of Trás-os-Montes and Alto Douro

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J.J. Cancela

University of Santiago de Compostela

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Wim van Leperen

Wageningen University and Research Centre

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