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Improving the pasture quality through the annual legumes oversowing: previous results on the seed bank response

Franca, Antonello and Seddaiu, Giovanna (2000) Improving the pasture quality through the annual legumes oversowing: previous results on the seed bank response. Options méditerranéennes. Série A: Séminaires méditerranéens, Vol. 45 , p. 359-364. ISSN 1016-121X. Article.

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Abstract

The understanding of changes in botanical composition and seed bank dynamics was the aim of an experiment conducted on a natural pasture and oversown with annual ryegrasss,u bclover and burr medic. The site is located in western Sardinia and was grazed at 8 eweshdyear in April, September and December. Viable seed bank (VSB) composition was assessed by collecting intact soil cores at the end of summer 1998. VSB pool components were separated by 3 germinatioddormancy breakdown treatments, thus estimating germinable (GSB) and dormant (DSB) seed bank. Autumn and spring overlying vegetation was estimated by non-destructive method using an HFRO sward stick, by recording 4 specific leaf contacts at the vertices of 1200 random quadrats (20 X 20 cm). Changes in overlying vegetation and VSB were analyzed after the durnig the fiist year after the oversowing: 15% of the VSB was represented by Trikliala subclover which contributed with almost all the seeds as readily germinable. ‘Anglona’ burr medic entrusted its persistence to the shedding of about 30% of its viable seeds as dormant. Among spontaneous species, more than the 50% of Cistus viable seeds was dormant, but many of these (about 40%) germinated when satisfied their cold requirements. The other components of the seed bank did not evidence significant chilling demand.

Item Type:Article
ID Code:4452
Status:Published
Refereed:Yes
Uncontrolled Keywords:Improved pasture, annual legumes, persistence, seed bank
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze agronomiche e genetica vegetale agraria
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto per il sistema produzione animale in ambiente Mediterraneo, Sassari
Publisher:CIHEAM-IAMZ
ISSN:1016-121X
Additional Information:Paper presented at the 10. Meeting of the Mediterranean Sub-Network of the FAO-CIHEAM Inter-Regional Cooperative Research and Development Network on Pastures and Fodder Crops, 2000/04/04-09, Sassari (Italy).
Deposited On:31 Aug 2010 19:30

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