4.4 Discussion
4.4.1 Beach and Dune Dynamics
The initial relief of the beach–dune system in the seaside park differed from the
relief of the natural barrier island, Ølsemagle Revle, further south in the bay of
Køge Bugt, especially with regard to the amount of beach sand (Gravesen and
Vestergaard 1969).
The natural beach was 10–20 m wide and had a height of up to about 1.5 m
above DNN. The man-made beach was much wider and higher (Fig. 4.2). The
large amount of sand contained in the man-made beach had important implications
for the later development of the whole system. Several foredunes were formed by
natural processes—sand movement and plant growth—on the man-made beach
within 24 years. These dunes were formed by two components of sand: the initial
Table 4.3 Life form and diaspore dispersal strategy spectra of the TWINSPAN groups
TWINSPAN group
A
B1
B2
C1
C2
C3
Life form, % of species
Rhizome geophytes
8
31
24
19
17
8
Root geophytes
0
0
10
14
8
8
Hemicryptophytes
31
23
43
33
42
50
Annuals
62
46
24
29
25
33
Phanerophytes
0
0
0
5
8
0
Dispersal strategy, % of species
By wind
54
23
57
67
42
67
By seawater
8
46
10
10
8
8
By wind shaking
8
8
5
0
8
0
Epizoic
0
0
5
0
0
0
Endozoic
0
0
0
5
8
0
No special strategy
31
23
24
19
33
25
Table 4.4 The distribution of the TWINSPAN groups in the permanent plots from 1979 to 2002
Dune 1a
Dune 1b
Dune 2
Dune 3
Dune 4
1979
A
A
A
B1
1980
A
A
B1
1981
A
A
B1
1982
A
B1
B1
1983
C1
B1
B1
1988
C1
C1
B2
B1
1990
C1
C1
B2
B1
1993
C3
C2
B2
B1
B1
1995
C3
C2
B2
B1
1997
C3
C2
C1
B2
B1
2002
C3
C2
C1
B2
B1
4 Natural Plant Diversity Development on a Man-Made Dune System
59