The natural sulphur content in the leaves of forest trees [Picea abies, Pinus silvestris, Abies alba, Fagus silvatica, Quercus petraea]

abies abies alba anatomia anatomie anatomy arbre arbre brise-vent arbre forestier arbre pour bois de construction azufre conifere conifers crops cultivos dicotiledoneas dicotyledons economic plants elements fagaceae fagales fagus feuille forest trees gimnospermas gymnosperme gymnosperms hedging plants hojas leaves no metales nonmetals ornamental plants ornamental trees picea picea abies pinaceae pinus pinus sylvestris plant anatomy plantas plantas ornamentales plantas para cercas vivas plantas protectoras plante plante de culture plante de haie plante de protection plante ornementale plante pour construction plants protective plants quercus soufre structural crops sulphur timber trees trees windbreak trees