Why do we study this topic? What are two or three challenges that we focus on with this line of research? Provide two or three challenges or key messages. 100-200 words.In terrestrial ecosystems, living organisms participate in the mediation of carbon, water, and nutrient cycles, both at local scales (ecosystems) and at the planetary level (the biosphere). Such biological control determines the quantity and quality of ecosystem services provided to human beings. For instance, at a global scale, forests absorb around 25% of human emissions of CO2 to the atmosphere, thereby helping to reduce the greenhouse effect. Studying how water, carbon and nutrients, enter and circulate within terrestrial ecosystems is key for understanding the functioning of ecosystems and their variability in space and time, as well as for predicting how this functioning may be modified in the contemporary context of global change.
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