The ability of forests to sequester1（使隔绝） carbon from the atmosphere depends on nutrients3 available in the forest soils, shows new research from an international team of researchers, including IIASA. The study, published in the journal Nature Climate Change, showed that forests growing in fertile soils with ample nutrients are able to sequester about 30% of the carbon that they take up during photosynthesis4. In contrast, forests growing in nutrient2-poor soils may retain only 6% of that carbon. The rest is returned to the atmosphere as respiration5（呼吸）.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 Ecosplayystems6 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.Marcosplay Fernandez-Martinez, first author of the paper and researcher at the Center for Ecological7 Research and Forestry8 Applications and the Spanish National Research Council says, In general, nutrient-poor forests spend a lot of energy -- carbon -- through mechanisms9 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 constraints10 such as phosphorus or the pH of the soil, which is related to the availability of nutrients. The new study includes both those factors as well as nitrogen availability, in an analysis synthesizing data from 92 forests in different climate zones on the planet. Tropical rainforests had the poorest nutrient availability, and the lowest efficiency for carbon sequestration, the researchers found.The researchers believe that the difference in efficiency of carbon absorption could be due to several factors. For one thing, plants in nutrient-poor soils devote more energy to locating nutrients.When plants are in nutrient poor conditions, they send out more roots and produce chemicals that can help dissolve nutrients from the soil. This takes energy, though, and so the plants produce less biomass, says Obersteiner.Furthermore, the study showed that nutrient-rich ecosplayystems also generally have more stable ground organic material, which is not easily degraded, and thus retains more carbon.
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1 sequester vt.使退隐，使隔绝 参考例句： Everything he owned was sequestered.他的所有财产都被扣押了。 This jury is expected to be sequestered for at least two months.预计这个陪审团将至少被隔离两个月。
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