The study showed that forests growing in fertile soils with ample nutrients are able to sequester about 30% of the carbon that they take up during photosynthesis. In contrast, forests growing in nutrient-poor soils may retain only 6% of that carbon. The rest is returned to the atmosphere as respiration.
“This paper produces the first evidence that to really understand the carbon cycle, you have to look into issues of nutrient cycling within the soil,” says IIASA Ecosystems Services and Management Program Director Michael Obersteiner, who worked on the study as part of a new international research project sponsored by the European Research Council.
Marcos Fernandez-Martinez, first author of the paper and researcher at the Center for Ecological Research and Forestry Applications (CREAF) and the Spanish National Research Council (CSIC) says, “In general, nutrient-poor forests spend a lot of energy—carbon—through mechanisms to acquire nutrients from the soil, whereas nutrient-rich forests can use that carbon to enhance biomass production.”
Until now, scientific models to predict forest carbon sequestration on a global scale had only considered the amount of nitrogen in the soil and did not take into account other constraints such as phosphorus or the pH of the soil, which is related to the availability of nutrients.
Read more at: Phys.org