Associative nitrogen fixation linked with three perennial bioenergy grasses in field and greenhouse experiments
Autor: | Haoliang Lu, Janet R. Donaldson, Mark A. Williams, Brett Rushing, Jayani J. Wewalwela, Yuan Tian, Jac J. Varco, Brian S. Baldwin |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
bioenergy grasses
Perennial plant Field (physics) Renewable Energy Sustainability and the Environment Stable isotope ratio lcsh:TJ807-830 lcsh:Renewable energy sources Greenhouse Forestry biomass yield lcsh:HD9502-9502.5 lcsh:Energy industries. Energy policy. Fuel trade Agronomy Bioenergy nitrogen fixation Biomass yield marginal soils Nitrogen fixation stable isotope Environmental science 15N2 Waste Management and Disposal Agronomy and Crop Science |
Zdroj: | GCB Bioenergy, Vol 12, Iss 12, Pp 1104-1117 (2020) |
ISSN: | 1757-1693 1757-1707 |
Popis: | Associative nitrogen (N2)‐fixation (ANF) by bacteria in the root‐zone of perennial bioenergy grasses has the potential to replace or supplement N fertilizer and support sustainable production of biomass, but its application in marginal ecosystems requires further evaluation. In this study, we first combined both greenhouse and field experiments, to explore the N2 fixation effects of three temperate feedstocks Miscanthus × giganteus (giant miscanthus, Freedom), Panicum virgatum (switchgrass, Alamo), and Saccharum sp. (energycane, Ho 02‐147). In field studies across three growing seasons, plant and soil pools of candidate feedstocks were partially composed of N derived from the atmosphere (Ndfa). Energycane, giant miscanthus, and switchgrass were estimated to derive >30%, %Ndfa. Greenhouse studies were also performed to trace isotopically labeled 15N2 into plant biomass and soil pools. Evidence for Ndfa was detected in all three feedstock grasses (using reference 15N of soil, chicory, and sorghum, δ15N~+7.0). Isotopically labeled 15N2 was traced into biomass (during grass elongation stage) and soil pools. Extrapolation of rates during the 24 hr labeling period to 50 days estimated 30%–55% of plant Ndfa, with the greatest Ndfa for energycane. The findings of the field natural abundance and greenhouse 15N2 feeding experiments provided complementary evidence that perennial bioenergy grasses have the potential to support relatively high rates of ANF, and accumulate diazotroph‐derived N into biomass when grown on non‐fertilized soil. |
Databáze: | OpenAIRE |
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