Retarded wetland succession: anthropogenic and climatic signals in a Holocene peat bog profile from north-east Hungary

Magyari, E.; Sumegi, P.; Braun, M.; Jakab, G.; Molnar, M.

doi:10.1046/j.0022-0477.2001.00624.x

Cited by 19 publications

(28 citation statements)

References 7 publications

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“…The study of Nyíres-tó confirmed this hypothesis, as the average cover of forested associations changed by only 3% in the last 20 years of the study, mainly due to the growth of the trees. However, the mire can return to a former state and succession can start again, but this happens only over longer time scales (Magyari et al 2001). Bragg and Tallis (2001) demonstrated that mire ecosystems are highly sensitive to change, especially in hydrology, and our study confirmed that water deficiency can change a mire ecosystem rapidly.…”

Section: Mire Dynamicssupporting

confidence: 77%

Changes in a Wetland Ecosystem: A Vegetation Reconstruction Study Based on Historical Panchromatic Aerial Photographs and Succession Patterns

Cserhalmi

Nagy

Kristóf³

et al. 2011

Folia Geobot

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This paper presents the methodology and results of a vegetation reconstruction method based on botanical sampling, the knowledge of succession pattern, digital photograph-interpretation and automatic delineation via image segmentation. The aim is to provide a methodology for interpretation of archived black-and-white aerial photographs, which can be applied at other study sites. Our study area was the Nyíres-tó mire in the Bereg Plain (NE Hungary). Initially, botanical sampling was carried out, and this was followed by separation and identification of current vegetation types. In our study we selected automatic delineation using multi-resolution image segmentation as the method for vegetation mapping. Based on the present-day vegetation map produced and the known successional pathway of the mire, archive aerial photographs were analyzed separately in reverse chronological order to derive plant associations present at the different photograph acquisition dates. With this method we were able to make a chronological sequence of digital vegetation maps over a period of almost fifty years . The analysis of vegetation maps showed that forest cover increased steadily until 1988. After an artificial water supply was introduced (in 1986), the spread of tree-dominated associations became slower, and the relative cover of the different vegetation types reached a stable state.

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Section: Mire Dynamicssupporting

confidence: 77%

Changes in a Wetland Ecosystem: A Vegetation Reconstruction Study Based on Historical Panchromatic Aerial Photographs and Succession Patterns

Cserhalmi

Nagy

Kristóf³

et al. 2011

Folia Geobot

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“…The extrapolation of the measurements suggests that this sediment hiatus developed around 2300 cal yr BP, during the Imperial Age when the area was probably settled by Celtic groups who probably deepened the peatbog which had evolved by then. A similar phenomenon was observed at Nagy-Mohos-tó near Kelemér (Magyari et al, 2001). However, the pollen from this location did not include hemp (Cannabis) remains, suggesting that the lakebed was deepened to gain water.…”

Section: Nbm-4 (247-193 CM 2300-1500 Cal Yr Bp)supporting

confidence: 73%

“…Sphagnum spp. This development shares numerous similarities with the formation of two other Sphagnum bogs at Csaroda-Báb-tava and Kelemér-Nagy-Mohos (Magyari et al , 2001, suggesting some sort of regularity in the formation of Hungarian Sphagnum bogs. M. longiseta preceding the expansion of Sphagna is highly interesting.…”

Section: Discussionmentioning

confidence: 90%

Palaeoclimatic signals and anthropogenic disturbances from the peatbog at Nagybárkány (North Hungary)

et al. 2009

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Investigation of a small peatbog in northern Hungary provides a late Quaternary record of vegetation development effected by climatic changes and anthropogenic disturbances. The aim of this study was to separate climatic signals from the development of a continental eutrophic peatland with the use of plant macrofossil analysis. The development of water catchment is reconstructed using pollen and geochemical analyses. The formation of the lakebed can be traced back to the Late Glacial. A higher water level with oligotrophic conditions can be existed from the Late Glacial to middle Holocene, when the reed beds covered a small area only. This was followed by a hiatus spanning ca. 4400 years, caused by peat cutting during the Imperial Age. The water level decreased and the water quality was more eutrophic. A reed bed evolved around the lake. Terrestrialization started with a bulrush floating mat phase at the close of the Á rpádian Age, ca. cal yr AD 1400. The initiation of the Sphagnum-bog underwent similar phases as in the other Hungarian peatbogs. Although remarkable anthropogenic disturbances can be reconstructed in the development of the peatbog, some climatic effects and authogenic processes might be separated by palaeoecological analyses.

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“…Similar low-sediment accumulation coupled with W. fluitans dominance was found in other lake/mire systems (e.g. Magyari et al, 2001) in the Carpathian region; therefore, it seems likely that the vegetation type is responsible for the low SAR. Between 9300-7900 and 5700-3800 cal yr BP, SAR was somewhat higher; 1 cm was deposited every 35-38 years resulting in a resolution of one proxy sample every 140 years.…”

Section: Chronologymentioning

confidence: 82%

Palaeolimnology of the last crater lake in the Eastern Carpathian Mountains: a multiproxy study of Holocene hydrological changes

et al. 2009

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A multi-proxy investigation (loss-on-ignition, major and trace elements, pollen, plant macrofossil and siliceous algae) was carried out on the sediment of a crater lake (Lake Saint Ana, 950 m a.s.l.) from the Eastern Carpathian Mountains. Diatom-based transfer functions were applied to estimate the lake's trophic status and pH, while reconstruction of the water-depth changes was based on the plant macrofossil and diatom records. The lowest Holocene water depths were found between 9000 and 7400 calibrated BP years, when the crater was occupied by Sphagnum-

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Retarded wetland succession: anthropogenic and climatic signals in a Holocene peat bog profile from north-east Hungary

Cited by 19 publications

References 7 publications

Changes in a Wetland Ecosystem: A Vegetation Reconstruction Study Based on Historical Panchromatic Aerial Photographs and Succession Patterns

Changes in a Wetland Ecosystem: A Vegetation Reconstruction Study Based on Historical Panchromatic Aerial Photographs and Succession Patterns

Palaeoclimatic signals and anthropogenic disturbances from the peatbog at Nagybárkány (North Hungary)

Palaeolimnology of the last crater lake in the Eastern Carpathian Mountains: a multiproxy study of Holocene hydrological changes

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