Seasonal dynamics of above- and below-ground biomass and nitrogen partitioning in Miscanthus × giganteus and Panicum virgatum across three growing seasons

dc.contributor.author Dohleman, Frank
dc.contributor.author Heaton, Emily
dc.contributor.author Heaton, Emily
dc.contributor.author Arundale, Rebecca
dc.contributor.author Long, Stephen
dc.contributor.department Agronomy
dc.date 2018-01-24T20:18:36.000
dc.date.accessioned 2020-06-29T23:04:34Z
dc.date.available 2020-06-29T23:04:34Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.issued 2012-09-01
dc.description.abstract <p>The first replicated productivity trials of the C4 perennial grass <em>Miscanthus</em> × <em>giganteus</em> in the United States showed this emerging ligno-cellulosic bioenergy feedstock to provide remarkably high annual yields. This covered the 5 years after planting, leaving it uncertain if this high productivity could be maintained in the absence of N fertilization. An expected, but until now unsubstantiated, benefit of both species was investment in roots and perennating rhizomes. This study examines for years 5–7 yields, biomass, C and N in shoots, roots, and rhizomes. The mean peak shoot biomass for <em>M</em>. × <em>giganteus</em> in years 5–7 was 46.5 t ha−1 in October, declining to 38.1 t ha−1 on completion of senescence and at harvest in December, and 20.7 t ha−1 declining to 11.3 t ha−1 for <em>Panicum virgatum</em>. There was no evidence of decline in annual yield with age. Mean rhizome biomass was significantly higher in <em>M</em>. × <em>giganteus</em> at 21.5 t ha−1compared to 7.2 t ha−1 for <em>P. virgatum</em>, whereas root biomass was similar at 5.6–5.9 t ha−1. <em>M</em>. × <em>giganteus</em> shoots contained 339 kg ha−1 N in August, declining to 193 kg ha−1 in December, compared to 168 and 58 kg ha−1 for <em>P. virgatum</em>. The results suggest substantial remobilization of N to roots and rhizomes, yet still a substantial loss with December harvests. The shoot and rhizome biomass increase of 33.6 t ha−1 during the 2-month period between June and August for <em>M</em>. × <em>giganteus</em> corresponds to a solar energy conversion of 4.4% of solar energy into biomass, one of the highest recorded and confirming the remarkable productivity potential of this plant.</p>
dc.description.comments <p>This article is published as Dohleman, Frank G., Emily A. Heaton, Rebecca A. Arundale, and Stephen P. Long. "Seasonal dynamics of above‐and below‐ground biomass and nitrogen partitioning in Miscanthus× giganteus and Panicum virgatum across three growing seasons." Gcb Bioenergy 4, no. 5 (2012): 534-544. doi: <a href="http://dx.doi.org/10.1111" target="_blank">10.1111/j.1757-1707.2011.01153.x</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/359/
dc.identifier.articleid 1361
dc.identifier.contextkey 11388780
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/359
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4708
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/359/2012_Heaton_SeasonalDynamics.pdf|||Fri Jan 14 23:45:53 UTC 2022
dc.source.uri 10.1111/j.1757-1707.2011.01153.x
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.keywords bioenergy
dc.subject.keywords biofuel
dc.subject.keywords C4 photosynthesis
dc.subject.keywords nitrogen use efficiency
dc.subject.keywords photosynthetic efficiency
dc.subject.keywords rhizome
dc.subject.keywords roots
dc.subject.keywords solar energy conversion efficiency
dc.title Seasonal dynamics of above- and below-ground biomass and nitrogen partitioning in Miscanthus × giganteus and Panicum virgatum across three growing seasons
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 716d7071-adb0-4700-9b63-b9da2205795e
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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