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Sz. Fóti Szent István University Institute of Botany and Ecophysiology, Faculty of Agricultural and Environmental Sciences Gödöllő Páter K. u. 1 H-2103 Hungary

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J. Balogh Plant Ecology Research Group of Hungarian Academy of Sciences Gödöllő H-2103 Hungary

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Z. Nagy Szent István University Institute of Botany and Ecophysiology, Faculty of Agricultural and Environmental Sciences Gödöllő Páter K. u. 1 H-2103 Hungary

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Zs. Ürmös Szent István University Institute of Botany and Ecophysiology, Faculty of Agricultural and Environmental Sciences Gödöllő Páter K. u. 1 H-2103 Hungary

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S. Bartha Hungarian Academy of Sciences Institute of Ecology and Botany Vácrátót H-2163 Hungary

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Z. Tuba

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Remnants of the former semiarid forest-steppe vegetation of Hungary are suspected to undergo degradation processes because of recent land-use changes. Secondary succession towards closing of the vegetation starts with shrub invasion, mainly with species of the shrub layer of loess steppe oak forest. Soil respiration (SR) activity of the intercanopy loess grassland community was followed occasionally along of six years period, as well as the spatial patterns of SR and soil water content (SWC) with three direct measuring campaigns. Dependence of SR on SWC-soil temperature was statistically significant for the six years period, but the rest of the variance should be explained by other factors, as found for normalized difference vegetation index. In the spatial analysis, significant differences were found in the ranges of semivariograms according to the seasonal variation of soil moisture content. Larger scale patches were found under summer water stress (4 m for SR, 2.6 m for SWC) and autumn senescence (3.8 m for SR, 1.3 m for SWC) periods than under well-watered, peak performance summer circumstances (0.8 m for SR, 0.6 m for SWC). This suggests that homogeneity of patterns is typical at good water supply, while coarse-grained patches prevail under drought stress.

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Community Ecology
Language English
Size A4
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2000
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1
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3
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Springer Nature Switzerland AG
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ISSN 1585-8553 (Print)
ISSN 1588-2756 (Online)