The project is subdivided into three tasks :

- “Benefits and drawbacks from forest investment in PSMs under intensified drought condition”. In this task, benefits will be evaluated by examining the role of PSMs as defence molecules as reducers of the oxidative pressure due to drought conditions. Drawbacks from plant investments in such defence molecules will be assessed through productivity changes.
- The task “Forest PSMs production as drivers of Biodiversity and decomposition processes” aims to understand how changes in PSMs of green leaves and then in leaf litter, under intensified drought, affect the relationships between plants and decomposers and therefore on litter decomposition, trough allelopathic effects.
- The last task is devoted to a synthesis of the results obtained and selected to be in-tegrated in a generic ecosystem model (ORCHIDEE). We will define a set of parameter to take into account the changes in plant allocation and their consequences on the carbon cycle. Then, such parameters will be used to run simulations at ecosystem and regional scales to estimate the impact of such changes in plant allocation of Mediterranean ecosystems carbon budget.

Schematic diagram of the investigations in SEC-PRIME2

The interface between task 1 and 2 is at the leaf level, which may be extrapolated to the stand level for each treatment via assessment of leaf area distribution (validated by litter collectors), the dynamics of nutrient release at the plot level of the control and rain exclusion treatment. Extrapolation to the regional level occurs through the generic ecosystem model ORCHIDEE (task 3).

Task 1

Description task 1

Task 2

Description task 2

Task 3
Description task 3

Articles publiés dans cette rubrique

mardi 5 février 2013
par  Romain DAVID

Objectives of the project

“The” overall objective of SEC-PRIME² is to study the effects of intensified drought condi-tions on Mediterranean ecosystem functioning. Its originality is the focus on plant invest-ment in PSMs as defence molecules that help plants to survive in a stressful (and changing) environment. More (...)