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We examined the interactive effects of elevated CO2, soil phosphorus (P) availability, and soil drought on nodulation, nitrogenase activity, and biomass allocation in Alnus hirsuta and Alnus maximowiczii. Potted seedlings were grown in either ambient or elevated CO2 (36 Pa and 72 Pa CO2), with different levels of P (7.7 and 0.77 mgP pot−1 week−1 for high-P and low-P, respectively) and water supply...
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