CO₂ and soil water potential as regulators of the growth and N fraction derived from fixation of a legume in tallgrass prairie communities

CO₂ and soil water potential as regulators of the growth and N fraction derived from fixation of a legume in tallgrass prairie communities

Background and Aims CO₂ enrichment may increase N input to ecosystems by increasing N₂ fixation, but the fixation-CO₂ response depends on factors such as soil water availability that are influenced by soil properties. Methods We used the δ¹⁵N natural abundance method to estimate the proportion of N...

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Veröffentlicht in:Plant and Soil. - Springer Science + Business Media. - 409(2016), 1/2, Seite 361-370
1. Verfasser: Polley, H. Wayne (VerfasserIn)
Weitere Verfasser: Collins, Harold P., Reichmann, Lara G., Fay, Philip A.
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2016
Zugriff auf das übergeordnete Werk:Plant and Soil
Schlagworte:Applied sciences Biological sciences Physical sciences
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100 1 |a Polley, H. Wayne  |e verfasserin  |4 aut 
245 1 0 |a CO₂ and soil water potential as regulators of the growth and N fraction derived from fixation of a legume in tallgrass prairie communities 
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520 |a Background and Aims CO₂ enrichment may increase N input to ecosystems by increasing N₂ fixation, but the fixation-CO₂ response depends on factors such as soil water availability that are influenced by soil properties. Methods We used the δ¹⁵N natural abundance method to estimate the proportion of N in the legume Desmanthus illinoensis that was derived from N₂ fixation following 2-8 years of growth along a subambient to elevated CO₂ gradient. Desmanthus was grown in tallgrass prairie communities on each of three soils of differing texture. Results Only on a clay soil was it possible to calculate fixation (Nfix; g N m⁻²). The fraction of legume N derived from fixation (Ndfa) decreased by 20 % as CO₂ increased from subambient to elevated concentrations. The negative effect of reduced Ndfa on Nfix was obscured by variation in Desmanthus production along the CO₂ gradient that was positively linked to the ANPP-CO₂ response of communities. Across soils, legume production was negatively correlated with soil water potential to 0.3 m depth (ψsoil). Conclusions Nfix in grasslands may depend primarily on ψsoil as influenced by soil hydrological properties. CO₂ enrichment may reduce Nfix during years in which the legume-CO₂ and related ANPP-CO₂ response is small by depressing Ndfa. 
540 |a © Springer Science+Business Media 2016 
650 4 |a Applied sciences  |x Food science  |x Foodstuffs  |x Food  |x Edible seeds  |x Legumes 
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650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Soils  |x Sandy loam soils 
650 4 |a Biological sciences  |x Agriculture  |x Agricultural sciences  |x Agronomy  |x Soil science  |x Soils  |x Silty soils 
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650 4 |a Biological sciences  |x Biology  |x Botany  |x Plants  |x Grasses 
650 4 |a Biological sciences  |x Ecology  |x Biomass  |x Biomass production 
650 4 |a Physical sciences  |x Earth sciences  |x Geography  |x Geomorphology  |x Rocks  |x Monoliths 
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700 1 |a Reichmann, Lara G.  |e verfasserin  |4 aut 
700 1 |a Fay, Philip A.  |e verfasserin  |4 aut 
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