Huglin index

Pierre Huglin developed a bioclimatic heat index for the wine-growing regions, the Huglin heat sum index (or after Huglin ) or heat index or Huglin index for short , in which the temperature sum above the temperature threshold of 10 ° C is calculated and this is summed up from April to September. Both the daily mean temperature and the maximum temperature are used in the calculation and the calculated sum is slightly modified with the geographical latitude. Each grape variety therefore requires a certain amount of heat in order to be successfully cultivated in an area in the long term. The calculated heat sums, which are based on data from weather stations, differ from the actual values in the vineyards because the sums are too low. The index does not take into account the thermally favored vineyard slopes, the temperature of which can be around 1.5 to 2 ° C higher.

calculation

The Huglin index is calculated as the product of the coefficient K and the sum from April 1 to September 30 of the arithmetic mean of the (daily / individual) daily mean and daily maximum temperatures minus the base temperature of 10 ° C:

{\ displaystyle H = HI = K \ cdot \ sum \ limits _ {01.04.} ^ {30.09.} \ left ({\ frac {T _ {\ mathrm {med}} + T _ {\ mathrm {max}}} { 2}} - 10 \ right) = K \ cdot \ sum \ limits _ {01.04.} ^ {30.09.} {\ Frac {\ left (T _ {\ mathrm {med}} -10 \ right) + \ left ( T _ {\ mathrm {max}} -10 \ right)} {2}} = K \ cdot \ sum \ limits _ {01.04.} ^ {30.09.} {\ Frac {T _ {\ mathrm {med}} + T_ {\ mathrm {max}} -20} {2}}}

T _med = daily mean temperature

T _max = daily maximum temperature

Base temperature = 10 ° C

K = parameter dependent on the latitude of the location; the sum is multiplied by a factor K depending on the latitude of the location , which takes into account the longer day lengths in northern latitudes in summer; for example:

K (40 °) = 1.02

K (50 °) = 1.06

Total heat index according to Huglin (1986) for different grape varieties


Huglin index H.	Grape varieties
H <1500	no cultivation recommendation
1500 ≤ H <1600	Müller-Thurgau , Blue Portuguese
1600 ≤ H <1700	Pinot Blanc , Burgundy Gray , Aligoté , Gamay Noir, Gewürztraminer
1700 ≤ H <1800	Riesling , Chardonnay , Silvaner , Sauvignon Blanc , Pinot Noir , Grüner Veltliner
1800 ≤ H <1900	Cabernet Franc ,
1900 ≤ H <2000	Chenin Blanc , Cabernet Sauvignon , Merlot , Semillion , Welschriesling
2000 ≤ H <2100	Ugni Blanc
2100 ≤ H <2200	Grenache , Syrah , Cinsaut
2200 ≤ H <2300	Carignan
2300 ≤ H <2400	Aramon

Consequences of a change in the Huglin index

Over the next few decades the Huglin index will continue to rise; In other words, the grape variety suitability of an area will continue to change. With the increase in the total heat, the range of grape varieties in the northern growing areas has already changed. Varieties that were previously only cultivated in wine-growing regions to the south have already achieved a certain importance in cultivation in Austria and Germany. The varieties Cabernet Franc , Cabernet Sauvignon , Merlot and Syrah are already being planted and successfully cultivated in the warmer regions of Austria . They have been added to the quality range.

literature

Pierre Huglin: Biologie et écologie de la vigne. Lavoisier (Edition Tec & Doc), Paris 1986, ISBN 2-601-03019-4 . P. 292 (371 pp.).
Pierre Huglin: Nouveau mode d'évaluation des possibilités héliothermique d'un milieu viti-cole. C. R. Académie d'Agriculture (Acad. Agric.), 1117-1126, 1978.
Dieter Hoppmann: Terroir, Weather - Climate - Soil, Verlag Ulmer KG, Stuttgart 2010, ISBN 978-3-8001-5317-6 , p. 28.
Daniela Dejnega: Viticulture all over Austria? , Der Winzer 6/2013, pp. 23–25, Österreichischer Agrarverlag, Vienna.

Individual evidence

↑ ^a ^b Pierre Huglin: Biologie et écologie de la vigne. Lavoisier (Edition Tec & Doc), Paris 1986, ISBN 2-601-03019-4 . P. 292 (371 pp.).

↑ Hans Reiner Schultz , Dieter Hoppmann, Marco Hofmann: The influence of climatic changes on the phenological development of the vine, the suitability of the variety as well as must weight and acid structure of the grapes. Contribution to the integrated climate protection program of the State of Hesse (InKlim 2012) of the viticulture department of the Geisenheim research institute , Geisenheim 2005, p. 12 f./32 ff. (PDF file; 2.88 MB)

↑ Gerd Götz: Will climate change be followed by a change in grape variety? ( Memento of the original from June 22, 2013 in the Internet Archive ) Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , DLR Rheinpfalz, Department of Viticulture and Oenology @1@ 2

↑ Matthias Petgen: Possibilities and limits of ripening control - How flexibly does the vine react? ( Memento of the original from June 22, 2013 in the Internet Archive ) Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , DLR Rheinpfalz, Viticulture and Oenology Department, lecture at the 60th Viticulture Days, 2007 (PDF file; 91 kB) @1@ 2

↑ Ulrike Maaß, Arnold Schwab: Warmth of grape varieties - climate change and choice of varieties, the German wine magazine, 10/21. May 2011, pp. 29–31

[Huglin_biologie-1] Pierre Huglin: Biologie et écologie de la vigne. Lavoisier (Edition Tec & Doc), Paris 1986, ISBN 2-601-03019-4 . P. 292 (371 pp.).

[2] Hans Reiner Schultz , Dieter Hoppmann, Marco Hofmann: The influence of climatic changes on the phenological development of the vine, the suitability of the variety as well as must weight and acid structure of the grapes. Contribution to the integrated climate protection program of the State of Hesse (InKlim 2012) of the viticulture department of the Geisenheim research institute , Geisenheim 2005, p. 12 f./32 ff. (PDF file; 2.88 MB)