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Associative nitrogen fixation linked with three perennial bioenergy grasses in field and greenhouse experiments

Journal Article · · Global Change Biology. Bioenergy
DOI:https://doi.org/10.1111/gcbb.12744· OSTI ID:1678757
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6]
  1. Department of Biological Sciences Mississippi State University Mississippi MS USA, Department of Agricultural Technology Faculty of Technology University of Colombo Colombo Sri Lanka
  2. Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems College of the Environment and Ecology Xiamen University Xiamen Fujian China
  3. School of Biological, Environmental, and Earth Sciences University of Southern Mississippi Hattiesburg MS USA
  4. Department of Plant and Soil Sciences Mississippi State University Mississippi MS USA
  5. Fujian Key Laboratory of Coastal Pollution Prevention and Control College of the Environment and Ecology Xiamen University Xiamen Fujian China
  6. Rhizosphere‐Soil Microbial Ecology and Biogeochemistry School of Plant and Environmental Sciences Virginia Polytechnic and State University Blacksburg VA USA

Abstract

Associative nitrogen (N 2 )‐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 N 2 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 15 N 2 into plant biomass and soil pools. Evidence for Ndfa was detected in all three feedstock grasses (using reference 15 N of soil, chicory, and sorghum, δ 15 N~+7.0). Isotopically labeled 15 N 2 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 15 N 2 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG36-06GO86025
OSTI ID:
1678757
Alternate ID(s):
OSTI ID: 1850243
OSTI ID: 1787062
Journal Information:
Global Change Biology. Bioenergy, Journal Name: Global Change Biology. Bioenergy Journal Issue: 12 Vol. 12; ISSN 1757-1693
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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