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.
Full text not available from this repository.
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.
I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore
Repository Staff Only: item control page