Environmental Engineering Reference
In-Depth Information
Figure 14.3
Seed bank longevity spectra of dry heathland communities (
Calluno - Genistion pilosae
and
Empetrion nigri
) and
dry grassland communities (
Thero - Airion
,
Sedo - Cerastion
,
Polygalo - Koelerion
and
Nardo - Galion saxatilis
). On the
X
axis, longevity
classes are indicated by the seed longevity index ranging from 0 (transient) to 10 (long-term persistent) according to data from
Thompson
et al
. (1997) . The
Y
axis gives the percentage per longevity class of the species in the community. The left-hand
panels indicate the proportion of the longevity class within the community for sheer presence of the species, and the
right-hand panels indicate the proportion taking into account the frequency of species in reference relevées of the database of
the
Vegetatie van Nederland
. (Modifi ed from Bekker
et al
. 2002 .)
