Definission: Any material within 2 m from the Earth's surface that is in contact with the atmosphere, with the exclusion of living organisms, areas with continuous ice not covered by other material, and water bodies deeper than 2 m.
Definission: Of seed bank longevity. Seeds do not germinate in the first favourable season after dispersal. Generally seed bank longevity is > 1 yr (could be longer but it is unknown).
