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Reproductive Phenology

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Simultaneous observations of species with different development strategies (Arnica montana, Trifolium alpinum, Nardus stricta, Vaccinium myrtillus, Carex sempervirens) enable to study a wide range of phenological responses to climatic variations and therefore to determine the best candidate species to become indicators of the effects of climate change on phenology. There are so-called early species, which flower first, as opposed to late species which flower later during the season. In the three years of monitoring of the action PhenoPlantes(2009-2011) the order of flowering of the species remained stable. Additionally, all of the species flowered earlier in the warmest years (see the figure). Monitoring reproductive phenology of herbaceous species implies the observation of the four main phenological stages: closed flower (floral bud), open flower (flowering), fruit ripening (ripening) and the end of reproduction (senescence). These four successive stages continue throughout the growing season. Observing these phases enables studying the sensitiveness of species to climate throughout their reproductive cycle.

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Vegetative phenology

Leaves growth of herbaceous species (vegetative phenology) was measured to study the sensitivity of vegetative growth to climatic variations and to compare it with reproductive phenology.

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The results of vegetative phenology monitoring are very similar to those observed for reproductive phenology. First of all, the effect of the altitude is still the main factor differentiating phenology between the study sites (see the figure). Secondly, species develop their leaves in the same order in any of the sites monitored and in any year.

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Phenology of growth forms

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Growth forms refer to categories of plants that have the same development strategies (growth and flowering) that lead to different response to variations in climate. The evergreen carex (Carex sempervirens) belongs to the group of sedges that flower rapidly and then develop their leaves. Leguminous species, such as the Alpine Trifolium (Trifolium alpestre) on the other hand, concentrate all their energy in the process of growth prior to flowering (see figure).

NEWS

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents

Jan 2013

NEW PAPER! "Phenology and carbon dioxide source/sink strength of a subalpine grassland in response to an exceptionally short snow season" was published on Environmental Research Letters

May 2013

Watch PhenoALP presentation video!

Jun 2014

NDVI database now available

Aug 2013

Do you want to start phenological observations in your classes? Here is the experience from Torgnon primary school.

Dec 2013

Midterm Meeting took place: have a look at the contents