Direct evidence that symbiotic N2 fixation in fertile grassland is an important trait for a strong response of plants to elevated atmospheric CO2

By Andreas Lüscher, U. Hartwig, D. Suter, J. Nösberger. 2000

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Elevated CO2 enhances nitrogen fixation and growth in the marine cyanobacterium Trichodesmium (2007, background): “Several species responded to enriched CO2 with increased N fixation (Marilley et al., 1999; Dakora & Drake, 2000; Luscher et al., 2000).”
What have we learned from 15 years of free-air CO2 enrichment (FACE)? A meta-analytic review of the responses of photosynthesis, canopy properties and plant production to rising CO2. (2004, background): “Lüscher et al. (2000) demonstrated the importance of N2-fixing capacity in the Swiss FACE experiment with effectively and ineffectively nodulating Medicago sativa.”
Changes in microbial activity and composition in a pasture ecosystem exposed to elevated atmospheric carbon dioxide (2002, background): “Presence of adequate N to support plant growth is a critical component in plant response to elevated CO2 (Luscher et al., 2000).”
Agroecosystem responses to combinations of elevated CO2, ozone, and global climate change (2003, unknown): “(Lüscher et al., 2000).”
Nitrogen fixation in perennial forage legumes in the field (2003, background): “Medicago sativa in monoculture maintains a high DM yield while Ndfa is decreased at high N fertilization (Figures 6c and 7c, Lüscher et al., 2000).”