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EUCFLUX network : Comparison of genetic material of the genus Eucalyptus under contrasting environmental and silvicultural conditions

Network and its devices names
Comparison of genetic material of the genus Eucalyptus under contrasting environmental and silvicultural conditions
 
Localisation
Itatinga municipality, São Paulo State, Brazil (Network's center: 22°58 0 04″S et 48°43 0 40″W)
Website
http://www.ipef.br/eucflux/

Tests clonaux eucalyptus

Network description

The EUCFLUX network consists of 10 sites located along a gradient with contrasting soils (texture, slope). Each site consists of 16 plots installed between 2009 and 2018 and 25 plots from 2018 onwards (total area of a site ~3ha), each of these plots being planted in a regular way (3*2 m) with different Eucalyptus genetic material. The studied genotypes (25 per site) are different species of Eucalyptus (E. grandis, E. urophylla, E. camaldulensis, E. longirostrata, E. dunnii, E. pilularis, E. pelita, E. tereticornis) and hybrids of these species, clones and seminal material. One of the plots is planted with Corymbia citriodora.


Eight sites were grouped in pairs, seeking maximum homogeneity of environmental conditions within each pair. Between 2009 and 2018 the pairs of sites are identical. From 2018 onwards, the plots are managed differently within each pair: one in coppice, the other in full stand planting. This makes it possible in this new phase to study different types of management.


The two unassociated sites in a pair will be replanted for one, and uncut for the other, so that the behaviour of different Eucalyptus genotypes can be studied at one site at much older ages than the usual commercial rotation (the trees will reach the age of 15 years at the end of the cycle, whereas the classical rotation is 6 years). The other replanted site will increase the number of sites to study the effects of soil gradients.

Services offer

The EUCFLUX network offers the opportunity to quantify the importance of environmental conditions, genome and management on the productivity and biogeochemistry of commercial Eucalyptus plantations. The number of materials compared, the size of the individual plots, and the quality of the monitoring carried out make it an important network for the study of this kind at the global level. The EUCFLUX network is regularly monitored including the quantification of carbon fluxes and storage as well as productivity (carbon allocation, litterfall, gross primary productivity, wood production, soil CO2 emission, soil carbon). Foliar ecophysiology (photosynthesis, stomatal conductance) and the environmental constraints, particularly water constraints, that determine it are also characterized on some of the sites/materials. A meteorological station is located at the centre of the network. One of the objectives of the network is thus to link individual productivity or growth trajectories to simple functional traits in intra-genotype (spatial variability) or inter-genotypes.


The use of models based on the representation of ecophysiological processes also provides estimates of water and nutrient consumption and light absorption at different sites/materials. Ultimately, this makes it possible to combine observations and simulations to study the resource use efficiency of different genetic materials. These models are notably constrained using data from an instrumented site (Eddy-covariance and soil water monitoring) located at the centre of this network. The network is located in one of the measurement areas of the Venµs satellite (https://venus.cnes.fr/en/VENUS/index.htm), which will make it possible to assess the potential of this type of new-generation satellite (high spatial and temporal measurement resolution) to characterize the canopy properties (LAI, leaf angles) of different Eucalyptus genetic materials.

Team

The network is coordinated by Joannès Guillemot and Guerric Le Maire (CIRAD researchers, UMR Eco&Sols, based in Brazil close to the network). The network also benefits from the support of Brazilian partners (private and public) to ensure the monthly monitoring of the network.

Work description and access modalities

The network is partly funded by a consortium of Brazilian companies in an inter-professional structure (IPEF, http://www.ipef.br/). Therefore, the sharing of raw data in the framework of scientific cooperation is subject to the agreement of these partners. The monitoring of the network includes many measurements carried out at different time steps (from bi-weekly to annual). The work includes dendrometric inventory campaigns, biomass measurements, litter collection and weighing, as well as measurements carried out using specific equipment (see last section).

Access unit and cost

Access to the network for scientific cooperation of all durations and budgets is encouraged and facilitated to the maximum extent possible. Contact the network coordinators directly.

The minimum cost of maintaining and monitoring the network (i.e., excluding a larger occasional measurement campaign) is estimated to be 60 k€ per year.

Facilities

For some sites: micrometeorological station, soil water content, water table height, soil temperature, soil CO2 emission (Li-8100, Li-COR®), flow tower, measurement of foliar ecophysiology (Li-6400, Li-COR®)