Please use this identifier to cite or link to this item: https://une.intersearch.com.au/unejspui/handle/1959.11/2724
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dc.contributor.authorGardener, M Ren
dc.contributor.authorWhalley, Ralph Den
dc.contributor.authorSindel, Brian Men
dc.date.accessioned2009-10-28T16:09:00Z
dc.date.issued2003en
dc.identifier.citationAustralian Journal of Agricultural Research, 54(6), p. 621-626en
dc.identifier.issn0004-9409en
dc.identifier.urihttps://hdl.handle.net/1959.11/2724en
dc.description.abstractThis is the second in a series of papers investigating the ecology of 'Nassella neesiana' (Trin. & Rupr.) Barkworth (Chilean needle grass) in pastures on the Northern Tablelands of New South Wales. The reasons for its success as a pasture weed are discussed. Nassella neesiana has a large and persistent soil seedbank. After 3 years without seed input, the seedbank declined from 4676 to 1323 seeds/m². When an exponential decay curve was fitted to the data it was predicted that the seedbank would reach 10 seeds/m² after 12.4 years. When seed production was large in 1996, 41.6% of seeds produced were incorporated into the seedbank, whereas in 1995 and 1997 the smaller seed production was only sufficient to maintain seedbank numbers. Furthermore, it is likely that the seedbank numbers were underestimated because they did not include basal cleistogenes. In a separate experiment, basal cleistogenes were found to contribute a further 20% to the seedbank. A small proportion of the viable seeds in a natural seedbank emerged from bare ground over 2 years. Seedling survival was high, with 78% of those germinating from bare ground surviving for at least 20 months. Several experiments were designed to investigate the mechanisms of this germination and survival. It appears that the seeds of 'N. neesiana' have an after-ripening requirement of between 3 months and 1 year for maximum germination. Lemma removal from seeds stored for 8 months increased germination from 49 to 82%. The rate of germination and the total percentage of seeds germinating also increased with time of burial in the ground. Of seeds that had been buried for 2 years, 90% germinated after laboratory incubation compared with 48% of seeds stored in the laboratory as controls. Depth of seed burial appears to affect seedling emergence and survival. A smaller number of seedlings emerged from 0–10 mm and they had lower survival than those from seed buried at 10–20 mm.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Agricultural Researchen
dc.titleEcology of 'Nassella neesiana', Chilean needle grass, in pastures on the Northern Tablelands of New South Wales. II: Seedbank dynamics, seed germination, and seedling recruitmenten
dc.typeJournal Articleen
dc.identifier.doi10.1071/AR01076en
dc.subject.keywordsLandscape Ecologyen
local.contributor.firstnameM Ren
local.contributor.firstnameRalph Den
local.contributor.firstnameBrian Men
local.subject.for2008050104 Landscape Ecologyen
local.subject.seo2008960804 Farmland, Arable Cropland and Permanent Cropland Flora, Fauna and Biodiversityen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailrwhalley@une.edu.auen
local.profile.emailbsindel@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:757en
local.publisher.placeMelbourne, Australiaen
local.format.startpage621en
local.format.endpage626en
local.peerreviewedYesen
local.identifier.volume54en
local.identifier.issue6en
local.title.subtitleSeedbank dynamics, seed germination, and seedling recruitmenten
local.contributor.lastnameGardeneren
local.contributor.lastnameWhalleyen
local.contributor.lastnameSindelen
dc.identifier.staffune-id:rwhalleyen
dc.identifier.staffune-id:bsindelen
local.profile.orcid0000-0002-2949-9891en
local.profile.orcid0000-0002-4100-218Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:2800en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleEcology of 'Nassella neesiana', Chilean needle grass, in pastures on the Northern Tablelands of New South Wales. IIen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 212<br />Views: 225<br />Downloads: 0en
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