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Young spruce trees (Picea abies L. [Karst.]) were planted in model ecosystems and exposed to atmospheric CO 2 concentrations of 280, 420, and 560 mol/L and to nitrogen input of 0, 30, 90 kg N ha -1 yr -1 (NH 4 NO 3 ). The soluble carbohydrates of mature, 2nd year needles were analyzed several times during the experimental period of 3 years. The predominant sugars...
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