Ökoregionen & Makroökologie

www2.tu-berlin.de/~kehl/project/lv-twk/10-subtrop-dry1-twk.htm
Vegetation
Desert type
+
Ecosystem
I.
semi desert
II.
III.
III.
III.
Autochthonous ecosystem
full desert
Autochthonous
and rarely Allochthonous
ecosystem
extreme desert
subtype 1
Autochthonous
+
Allochthonous ecosystem
extreme desert
subtype 2
Autochthonous
+ frequently Allochthonous
ecosystem
extreme desert
subtype 3
Autochthonous in oases,
otherwise
Allochthonous ecosystem
Groundwater-dependent
Precipitation-dependent
Life form Spatial Temporal Life form Spatial Temporal
P contracted e.g.
(perennial) wadis
A contracted e.g.
(annual) at wadi mouth
P
contracted e.g.
oases
permanent
seasonal
permanent
P
A
P+pP
A -- -- A
P
contracted
only in oases
permanent
P+pP
A -- -- A
P
contracted
only in oases
permanent
A -- -- A
P
contracted e.g.
oases
pP
diffuse +
contracted
diffuse +
contracted
contracted, e.g. in
runnels + playas
Rainfall in
mm/year +
occurrence
permanent 250 - 100 (80)
seasonal
mostly
permanent
and rarely
contracted, e.g. in seasonal and
runnels + playas accidental
contracted, e.g. in
wadis + playas
contracted, e.g. in
wadis + playas
contracted, e.g. in
wadis + playas
contracted, e.g. in
wadis + playas
accidental and
rarely
permanent
accidental
seasonal
100 (80) -
50 (20)
mostly seasonal
but spotty
50 (20) - 5
episodical spotty
accidental 5 - 1
--
mostly seasonal
but spotty
permanent -- -- -- < 1
A -- -- -- -- --
extremely
episodical and
spotty