Alnion Forests in Lower Saxony (FRG), Their Ecological Requirements, Classification and Position within Carici Elongatae-Alnetum of Northern Central Europe
Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Alnion Forests in Lower Saxony (FRG), Their Ecological Requirements, Classification and Position within Carici Elongatae-Alnetum of Northern Central Europe
Beteiligte:
Döring-Mederake, Ute
Erschienen:
Kluwer Publishers, 1990
Erschienen in:Vegetatio
Sprache:
Englisch
ISSN:
0042-3106
Entstehung:
Anmerkungen:
Beschreibung:
<p>In the diluvial plain of Lower Saxony (= Niedersachsen) two types of alder fen woods are found: alder swamp woods ('alder carrs') with a more changing water table and inundations in winter, and alder spring woods without hibernal inundation and a more or less constant water table. While all alder swamp woods are Alnion forests, the alder spring woods can be devided into Alnion and Alno-Ulmion forests. All Alnion forests in the diluvial plain of Lower Saxony belong to the association Carici elongatae-Alnetum Schwick. 1933. This association can be devided into three subassociations, C. el.-Al. betuletosum Bodeux 1955, C. el.-Al. typicum Meijer Dress 1936 and C. el.-Al. cardaminetosum Meijer Drees 1936. Low pH-values and high C/N-ratios of the soil are good indicators to distinguish the Carici elongatae-Alnetum betuletosum from the other two subassociations. Humus contents has a tendency to decrease in the sequence C. el.-Al. betuletosum &gt C. el.-Al. typicum &gt C. el.-Al cardaminetosum, but is no reliable factor for classification of a single plot. Differences in annual groundwater level variations cause a floristical differentiation only within alderwoods of meso- to eutrophic sites. Here a nearly constant water table or at least no hibernal inundation leads to a Carici elongatae-Alnetum cardaminetosum, while sites which are inundated in winter carry the Carici elongatae-Alnetum typicum. On oligotrophic sites both, swamp and spring woods belong to the Carici elongatae-Alnetum betuletosum. The subdivision of the Carici elongatae-Alnetum for the whole lowlands of northern Central Europe is generally the same as for Lower Saxony.</p>