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

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Z. Barcza Eötvös Loránd University Department of Meteorology, Institute of Geography and Earth Sciences, Faculty of Sciences H-1518 Budapest P.O. Box 32 Hungary

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J. Balogh Szent István University Plant Ecology Research Group of Hungarian Academy of Sciences H-2103 Gödöllő Páter K. u. 1 Hungary

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

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

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Z. Tuba

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

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Interannual variation of carbon fluxes of grasslands on sandy (5 years data) and heavy clay soils (4 years data) have been analysed. The sandy grassland was carbon sink in 3 (2004, 2005, 2006) out of the investigated 5 years. Its annual C-balance is precipitation limited, the relation seems strongly conservative, with r 2 of 0.83. More than half of the net source activity fell to the summer droughts. The heavy clay grassland was net source of carbon in one year (2007) only with no whole year record from 2003, a drought and heat wave year. Dependence of the C-balance on precipitation was somewhat weaker (r 2 =0.57) than in the sandy grassland. Length of growing period showed less variation here compared to the sandy grassland. Recovery of sink activity after rains was much slower for the heavy clay grassland than for the sandy grassland. The reason behind is that the amount of water required to reach optimal soil water content for plant functioning is several times larger for the mountain grassland. This fact and the low conductivity of the clay soil for water decrease the heavy clay grassland’s recovery potential after droughts. Owing to these soil characteristics, the clay grassland may be more vulnerable to droughts in terms of decreased C-assimilation and (soil) carbon losses under the predicted drier summers even if the annual precipitation sum was higher by 10.7% on average for the mountain compared to the sandy grassland. The annual precipitation sum is close to the threshold, below which the grasslands may turn into source of carbon. While in one hand this can be viewed as an example of ecosystem scale adaptation to available water, drought events also involve loss of soil carbon and a potential positive feedback between source activity and decreasing net primary production, on the other.

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Community Ecology
Language English
Size A4
Year of
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2000
Volumes
per Year
1
Issues
per Year
3
Founder Akadémiai Kiadó
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H-1117 Budapest, Hungary 1516 Budapest, PO Box 245
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Springer Nature Switzerland AG
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ISSN 1585-8553 (Print)
ISSN 1588-2756 (Online)