E-2475 Post-doc in Carbon Budgeting Strategies in

il y a 2 jours

EschsurAlzette, Luxembourg Luxembourg Institute of Science and Technology (LIST) Temps plein

Description
**Temporary contract | 24 months | Belvaux**:
***:
**Are you passionate about research? So are we Come and join us**:
The Luxembourg Institute of Science and Technology (LIST) is a Research and Technology Organization (RTO) active in the fields of materials, environment and IT. By transforming scientific knowledge into technologies, smart data and tools, LIST empowers citizens in their choices, public authorities in their decisions and businesses in their strategies.

The Luxembourg Institute of Science and Technology (LIST) is offering a fully paid Post-doctoctoral position in the framework of a newly funded Doctoral Training Unit (DTU) in Forest ecosystems: “Forest function under stress” (FORFUS). FORFUS is funded through the PRIDE scheme of the Luxembourg National Research Fund (FNR). The main objective of FORFUS is to train a new generation of highly skilled experts with a view to contribute to solving some of the most pressing challenges related to forest health and resilience management. This position is envisaged to start between October 1st 2024 and December 1st 2024 and will extend over a maximum duration of 2 years.

***:
**How will you contribute?**:
The general theme of this Post-doc project is on the temporal dynamics of water exchanges inside the critical zone. The focus is set on a more realistic understanding of the transpiration process in forest ecosystems. Despite the importance of plant transpiration in the water cycle, the mechanisms that regulate its contribution are still poorly understood and have been little investigated.

To this day the influence of heterogeneous nutrient availability on the root carbon budget is not well understood. Specifically, the dynamics and intensity of root nutrient uptake and growth adaptations to changing accessibility of nutrient pools in space and time according to soil moisture levels and soil compaction intensity are not known. We are interested in investigating these adaptations in terms of carbon budget changes in a typical forest soil environment, where three main nutrient pools are normally represented by the litter layer pool (in the topsoil), by the soil pool and by the saprolite and bedrock pool (deep soil), and where nutrient accessibility is determined by moisture levels and affected by the extent of soil compaction. We want to answer the following research questions:

- How is the root carbon budget affected under different accessibilities of different nutrient pools?
- Is water redistribution a means to facilitate nutrient uptake from easily accessible nutrient pools over less accessible nutrient pools?
- How does soil compaction affect root water and nutrient uptake?

To answer those questions, we plan to set up a controlled experiment that will consist of the typical temperate deciduous forest soil horizons and have a litter layer at the top and a regolith/bedrock layer at the bottom. We will use optode sensor foils and place them by the nutrient pools to observe the CO2, O2 and pH dynamics deriving from root activity and from root exudates and utilize different stable water isotopes. We will monitor local root growth rates by utilizing repetitive and non-destructive root imaging techniques. We will use several replicas with different treatments in order to have a clearer idea of what strategies are implemented and if the carbon budgeting and allocation change under known controlled conditions. The aboveground part of the trees will be contained in a chamber and the transpiration rates and photosynthetic gas exchanges will be measured with LICOR in order to determine water uptake rates and plant performance. Observations of root growth rates, transpiration and photosynthetic rates as well as of root CO2 release and O2 consumption will provide indications of potential strategies and changes in carbon budgeting implemented to cope with soil compaction while meeting transpiration demand.

**Education**
- PhD degree in Environmental sciences with a focus on soil/root interactions and/or nutrient biogechemistry

**Experience and skills**
- A strong experience in setup and implementation of laboratory experiments. Any experience in using isotope tracers and in preparing/analysing environmental samples for trace element concentrations (ICP-MS, ICP-OES) and/or stable isotopes (Laser Spectroscopy, IRMS) will be considered as an asset.
- A recognized track record in the scientific field of their PhD. Selection criteria will focus on the scientific quality of their research output.
- Class B driving license

**Language skills**
- Good level both written and spoken English and French
- High motivation and communication skills within an international multi
- to interdisciplinary research environment

**Your LIST benefits**:

- An organization with a passion for impact and strong RDI partnerships in Luxembourg and Europe that works on responsible and independent research projects
- Sustainable by design, empowering our belief that we

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