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1.

001-es BibID:BIBFORM057810
Első szerző:Fekete István
Cím:The effects of detritus inputs on soil organic matter content and carbon dioxide emission in a Central European deciduous forest / István Fekete, Zsolt Kotroczó, Csaba Varga, Zsuzsa Veres, János Attila Tóth
Dátum:2011
Megjegyzések:A major objective of our research was to survey soil biological activity and organic mattercontent reduction in a Central European oak forest during treatments of various detritus inputs within theSíkf kút DIRT (Detritus Input and Removal Treatments) Project. Beside the control, three detritusremoval and two detritus duplication treatments were applied. Our examinations have proven that soilorganic matter content declined relatively fast in detritus removal treatments. The reduction wasespecially remarkable in root detritus removal treatments, where - due to the lack of transpiration - soilswere moister during the whole year than in the other treatments. The higher moisture content, despite ofthe reduction of detritus input, produced an intense soil respiration. This can be explained by the fact thatdecomposing organisms have increased the use of soil organic matter. Detritus input reduction had asignificantly greater effect on soil respiration and organic matter content than detritus input duplicationof the same extent. The latter did not cause any significant change compared to the control.
ISBN:1787-064X
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban
litter manipulation
soil respiration
DIRT Project
humus content
climate change
Megjelenés:Acta Silvatica et Lignaria Hungarica. - 7 (2011), p. 87-96. -
További szerzők:Kotroczó Zsolt (1975-) (biológus, ökológus) Varga Csaba Veres Zsuzsa (1984-) (környezetkutató) Tóth János Attila (1945-) (ökológus)
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2.

001-es BibID:BIBFORM057603
Első szerző:Kotroczó Zsolt (biológus, ökológus)
Cím:Effects of Climate Change on Litter Production in a Quercetum petraeae-cerris Forest in Hungary / Zsolt Kotroczó, Zsuzsa Veres, István Fekete, Mária Papp, János Attila Tóth
Dátum:2012
ISSN:1787-064X
Megjegyzések:Climate change is a global problem. During the last century the increase of annual averagetemperature was 0.68?C, while the decrease of annual average of precipitation was 83 mm in Hungary.According to the long term meteorological data of Síkfőkút forest ILTER site the annual averagetemperature increased while average of yearly precipitation decreased, the forest climate becamewarmer and dryer. These processes could considerably contribute to forest decline, not only in theQuercetum petraeae-cerris stand of Síkfőkút, but everywhere in the country. Species composition andstructure of the forest have changed considerably, as 68% of sessile oak (Quercus petraea) and 16% ofTurkey oak (Quercus cerris) have died. Forest decline resulted in the breaking up of the formerlyclosed canopy, and consequently, in the formation of gaps in the forest. In the gaps, a secondarycanopy developed with tree species of less forestry value. As a consequence, mass regeneration offield maple (Acer campestre) appeard in the gaps. The formation of gaps accelerated the warming andaridity of forests. In the article we answer the following question: how did climatic change andchanging forest structure influence the leaf-litter production in the last four decades?
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban
oak forest
oak decline
Síkfokút Project
litter production
climate change
Megjelenés:Acta Silvatica et Lignaria Hungarica. - 8 : 1 (2012), p. 31-38. -
További szerzők:Veres Zsuzsa (1984-) (környezetkutató) Fekete István (1986-) (élelmiszerminőség-biztosító agrármérnök) Papp Mária (1952-) (biológus, botanikus) Tóth János Attila (1945-) (ökológus)
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3.

001-es BibID:BIBFORM030985
Első szerző:Mészáros Ilona (biológus)
Cím:Diurnal and seasonal changes in stem radius increment and sap flow density indicate different responses of two co-existing oak species to environmental stress / Ilona Mészáros, Péter Kanalas, András Fenyvesi, József Kis, Balázs Nyitrai, Erzsébet Szőllősi, Viktor Oláh, Zita Demeter, Ágnes Lakatos, István Ander
Dátum:2011
ISSN:1786-691X 1787-064X
Megjegyzések:Using continuous monitoring of stem radius combined with sap flow measurements weassessed the effects of environmental conditions on tree radial growth and water status of two coexistingoak species (Quercus petraea and Quercus cerris) at high resolution time in growingseasons of 2008 and 2009. The forest (95?100 yr) is situated in a xeric site in the transition zonebetween forested and forest-steppe regions in north-eastern Hungary, Bükk mountains (47o90'N,20o46'E, elevation 320?340 m a.s.l.). Weather conditions in the growing season of 2008 (totalrainfall 354 mm, mean daily temperature 17.0 oC) was less extreme than in 2009 (total rainfall299 mm, temperature 17.9 oC). Rainfall strongly determined the course of radial growth incrementin trees. Radial growth of trees was limited in 2009 due to the drought in spring. The maximumradial increment of both species was achieved three weeks earlier (4th week of June) than in 2008(4th week of July). We used dendrometer monitoring data for estimation of stem (tree) waterdeficit ( W) by measuring water-related changes in stem radius (Zweifel et al. 2005). Themagnitude of tree water deficit variation ( W) was always smaller in Q. cerris than in Q. petraea.In contrast, Quercus cerris always exhibited larger daytime averages and maxima of sap flowdensity. In August of 2009 when drought became severe there were larger increases in tree waterdeficit ( W) (50?55 %) in both species compared to July as it could be expected from the extentof decreases in sap flow density (24?28%). Our data suggested that due to the low SWC thetranspiration was supported mainly from the inner water storage of trees during prolonged droughtwhich resulted in high stem water deficit ( W).
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény hazai lapban
Doktori Iskola
drought
forest
potential evapotranspiration
Quercus petraea
Quercus cerris
stem (tree) water deficit
Megjelenés:Acta Silvatica et Lignaria Hungarica. - 7 (2011), p. 97-108. -
További szerzők:Kanalas Péter (1983-) (biológus) Fenyvesi András Kis József Nyitrai Balázs (1987-) (ökológus) Szőllősi Erzsébet (1983-) (biológus) Oláh Viktor (1980-) (biológus) Demeter Zita (1985-) (biológia-kémia szakos tanár) Lakatos Ágnes Ander István
Pályázati támogatás:TÁMOP-4.2.2/B-10/1-2010-0024
TÁMOP
Juhász-Nagy Pál Doktori Iskola
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4.

001-es BibID:BIBFORM069621
Első szerző:Misik Tamás (biológus, ökológus)
Cím:Understory development in an oak forest in Northern-Hungary: the subcanopy layer / Tamás Misik, Imre Kárász, Béla Tóthmérész
Dátum:2014
ISSN:1787-064X
Megjegyzések:Structural changes in the shrub layer were analysed in a Hungarian oak forest after the oak decline pandemics. This paper focuses on the following questions: (1) which of the woody species tolerated better the forest conditions after oak decline? (2) What are the ecological factors that explain the successful response of woody species to changes in light and thermal conditions? In the monitoring plot, the structural condition of specimens only above 8.0 m was observed. After the appearance of oak decline some Acer campestre, Cornus mas and Acer tataricum specimens appeared that reached between 8.0-13.0 m in height. Significant differences were revealed between top canopy density and foliage cover of the subcanopy and between top canopy density and mean cover of field maple. The findings of the study indicate that the forest responded to oak decline with significant structural rearrangement in the shrub layer and that three woody species compensated for the remarkable foliage loss in the top canopy. These species formed a second crown layer directly below the canopy formed by oaks.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény hazai lapban
shrub community
woody species
Acer campestre L.
cover
dead oaks
Megjelenés:Acta Silvatica et Lignaria Hungarica 10 : 1 (2014), p. 9-21. -
További szerzők:Kárász Imre (1949-) (biológia-kémia szakos tanár) Tóthmérész Béla (1960-) (ökológus)
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5.

001-es BibID:BIBFORM031266
Első szerző:Tóth János Attila (ökológus)
Cím:Effect of Litter Fall on Soil Nutrient Content and pH, and its Consequences in View of Climate Change (Síkfőkút DIRT Project) / János Attila Tóth, Péter Tamás Nagy, Zsolt Krakomperger, Zsuzsa Veres, Zsolt Kotroczó, Sándorné Kincses, István Fekete, Mária Papp, Kate Lajtha
Dátum:2011
ISSN:1786-691X 1787-064X
Megjegyzések:In the DIRT (Detritus Input and Removal Treatment) field experiments established at the Síkfőkút Site (North Hungary) in October 2000, an experiment was initiated to study the long-termeffects of litter quality and quantity on pH and nutrient content (organic carbon, N forms, PO43?, K+,Mg2+, Ca2+) of soil in a Quercetum petraeae-cerris forest. An eight-year litter manipulationdemonstrated a close connection between the changes in pH and Mg2+ and Ca2+ concentration. Thedecline of litter production, the decrease of the soil pH due to lower Mg2+ and Ca2+ input lead toconsequent reduction of soil buffering capacity. The acidification interferes with the decompositionprocess of litter and humus compounds. Our results suggest decreases in organic matter content, totalN, Ca2+ and Mg2+ concentrations in the soil as a consequence of decline in forest litter productioninduced by climate change and a resulting degradation of the soil over a longer period.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban
Megjelenés:Acta Silvatica et Lignaria Hungarica. - 7 (2011), p. 75-86. -
További szerzők:Nagy Péter Tamás (1970-) (vegyész) Krakomperger Zsolt (1980-) (biológia tanár) Veres Zsuzsa (1984-) (környezetkutató) Kotroczó Zsolt (1975-) (biológus, ökológus) Kincses Sándorné (1964-) (agrokémia) Fekete István Papp Mária (1952-) (biológus, botanikus) Lajtha, Kate
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6.

001-es BibID:BIBFORM056999
Első szerző:Veres Zsuzsa (környezetkutató)
Cím:Dehydrogenase Activity in a Litter Manipulation Experiment in Temperate Forest Soil / Zsuzsa Veres, Zsolt Kotroczó, Kornél Magyaros, János Attila Tóth, Béla Tóthmérész
Dátum:2013
ISSN:1786-691X 1787-064X
Megjegyzések:Soil enzyme activities are "sensors" of soil organic matter (SOM) decomposition sincethey integrate information about microbial status and physico-chemical condition of soils. Wemeasured dehydrogenase enzyme activity in a deciduous temperate oak forest in Hungary under littermanipulation treatments. The Síkfőkút Detritus Input and Removal Treatments (DIRT) Projectincludes treatments with doubling of leaf litter and woody debris inputs as well as removal of leaflitter and trenching to prevent root inputs. We hypothesized that increased detrital inputs increaselabile carbon substrates to soils and would increase enzyme activities particularly that ofdehydrogenase, which has been used as an indicator of soil microbial activity. We also hypothesizedthat enzyme activities would decrease with detritus removal plots and decrease labile carbon inputs tosoil. After ten years of treatments, litter removal had a stronger effect on soil dehydrogenase activitythan did litter additions. These results showed that in this forest ecosystem the changed litterproduction affected soil microbial activity: reduced litter production decreased the soil dehydrogenaseactivity; increased litter production had no significant effect on the enzyme activity.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény hazai lapban
Megjelenés:Acta Silvatica et Lignaria Hungarica. - 9 : 1 (2013), p. 25-33. -
További szerzők:Kotroczó Zsolt (1975-) (biológus, ökológus) Magyaros Kornél Tóth János Attila (1945-) (ökológus) Tóthmérész Béla (1960-) (ökológus)
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