MONTHLY UPDATES

November 2022

Rwanda TREE that was broadcasted on national Rwandan television to celebrate the launch of the 2022/23 Forest Planting Season. The part about Rwanda TREE 9is 4-5 minutes and starts at 9:10 in the French version (https://youtu.be/568X4EY83WI) and at 24:00 in the Kinyarwandan version (https://youtu.be/Q3XUYAMPIy4).

November 2022

September 2022 (B)

Dr Maria Wittemann celebrating her new PhD title after a successful defense on 30th September!

September 2022 (B)

September 2022 (A)

Maria is nailing her PhD thesis 'Thermal plasticity and limitations in tropical trees' on 9th September.

September 2022 (A)

August 2022

Myriam and Brigitte studying photosynthetic heat tolerance using IR lamps and chlorophyll fluorimetry.

August 2022

June-July 2022 (C)

Brigitte is making a gas exchange measurement on two leaves from each of the harvested trees, directly after the tree and branch has been cut.

June-July 2022 (C)

June-July 2022 (B)

Lots of samples are collected each day on our 1000-tree harvest (20% of the trees in the plantations).

June-July 2022 (B)

June-July 2022 (A)

Felicien leading the team on branch/leaf level work at the harvest, here at Sigira site.

June-July 2022 (A)

May 2022 (F)

Olivier is staring up another sap flow measurement campaign on trees in Makera during the dry period, early June to early September.

May 2022 (F)

May 2022 (E)

Myriam and Brigitte measuring gas exchange of leaves on branches cut (and re-cut under water) from freshly harvested trees.

May 2022 (E)

May 2022 (D)

Felicien separating leaves and wood from sampled branches to estimate whole-tree leaf area and mass.

May 2022 (D)

May 2022 (C)

Athanase measuring the fresh mass of branches.

May 2022 (C)

May 2022 (B)

Some trees were small, others BIG!!! Here the stem base of a five year-old Polycias fulva tree in Rubona, together with Johan's sunglasses.

May 2022 (B)

May 2022 (A)

Partial harvest of 20% of the trees in Rwanda TREE (>1000 trees) began on May 23rd and will last for nine weeks, three at each site. Left: Nkuba (cutting trees), right: Bercare (measuring stems).

May 2022 (A)

April 2022

Some of us at the dissertation of Johanna Lethin at the University of Gothenburg. Etienne Zibera (to the right) is visiting Sweden to take the course "Plant ecophysiology in a global change perspective".

April 2022

March 2022

Installation of soil lysimeter for coming sampling of soil water 18O isotopes to estimate functional rooting depth. Persons working: Etienne Zibera, Göran Wallin and Ntirugulirwa Bonaventure.

March 2022

January-February 2022

Great start of 2022 with three new publications with Rwanda TREE data:

Manishimwe A, Ntirugulirwa B, Zibera E, Nyirambangutse B, Mujawamariya M, Dusenge ME, Bizuru E, Nsabimana D, Uddling J, Wallin G (2022) Warming responses of leaf morphology are highly variable among tropical tree species. Forests 13:219.
(link: https://doi.org/10.3390/f13020219)

Wittemann M, Anddersson MX, Ntirugulirwa B, Tarvainen L, Wallin G, Uddling J (2022) Temperature acclimation of net photosynthesis and its underlying component processes in four tropical tree species. Tree Physiology.
(link: https://doi.org/10.1093/treephys/tpac002)

Crous K, Uddling J, De Kauwe MG (2022) Temperature responses of photosynthesis and respiration in evergreen trees from boreal to tropical latitudes. New Phytologist.
(link: https://doi.org/10.1111/nph.17951)

January-February 2022

December 2021

Etienne Zibera leading the 14th stem growth measurement campaign at all sites, this time also making tree health inspections.

December 2021

November 2021

See our new paper in New Phytologist: "Handling the heat – photosynthetic thermal stress in tropical trees" by Tarvainen et al.

Link: https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.17809?af=R

November 2021

October 2021

A paper with three Rwanda TREE co-authors was recently published in Nature! Our research contributed valuable Nyungwe data on aboveground C stocks for tropical montane forests.

Link: https://www.nature.com/articles/s41586-021-03728-4?proof=t%25C2%25A0

October 2021

September 2021

Olivier measuring nighttime sapflow with a portable thermal dissipation probe system, with sensors installed on >100 trees.

September 2021