Grasslands

Z. Nagy, Z. Barcza, L. Horváth, János Balogh, Andrea Hagyó, Noémi Káposztás, Balázs Grosz, Attila Machon, Krisztina Pintér

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)

Abstract

In this chapter, exchange dynamics of greenhouse gases over Hungarian grassland ecosystems are analyzed. Carbon dioxide (CO2) exchange was measured by eddy covariance technique at three sites (Bugac, Mátra, and Hegyhátsál). Methane (CH4) and nitrous oxide (N 2O) fluxes were occasionally measured by static chamber method partly at the same grassland sites and at a wetland site. Dry grasslands (Bugac and Mátra) were net sources of CO2 in extreme drought years on annual time scale, while in other years they acted as sinks. The relatively humid Hegyhátsál was a net sink of CO2 on annual time scale during the measurement period. The different soil types (light sandy soil, heavy clay soil, and loamy soil) and the variable amount of annual precipitation sums (ranging from 551 to 747 mm) provided a unique opportunity to analyze the response of CO2 dynamics of grasslands to the soil type and effect of water stress. In case of the sandy grassland (Bugac), the exclusive role of the annual precipitation sum in the determination of annual NEE is strongly coupled to the soil type. Although the sandy grassland expressed adaptation to drought, the CO2 sink-source precipitation threshold was within the standard deviation (112 mm) of the annual precipitation, showing the high risk of desertification in this ecosystem. Grassland ecosystem on heavy clay soil was more vulnerable to drought stress than the grassland on sandy soil due to the worse water management properties of the clay soil. At the grassland on loamy soil in the more rainy western part of the country, gross primary production was occasionally limited by high soil water contents. This grassland has good adaptation capabilities to uneven precipitation distribution owing to the high silt fraction of the soil resulting in high water storage capacity. CH4 flux above grasslands was within the range of-54 to 58 mg CH4 m-2 year-1 (negative flux means uptake by the soil). Wetland soils are generally CH4 emitters. Annual mean of N2O soil emission varied between 0.005 and 0.17 g N2O m-2 year-1 with 6-year averages of 0.08 and 0.03 g N 2O m-2 year-1 for sandy/loess and clay soils, respectively. Mean soil flux of N2O over wetlands was similar to N2O emission over dry grasslands.

Original languageEnglish
Title of host publicationAtmospheric Greenhouse Gases: The Hungarian Perspective
PublisherSpringer Netherlands
Pages91-119
Number of pages29
ISBN (Print)9789048199495
DOIs
Publication statusPublished - 2011

Fingerprint

grassland
clay soil
soil type
soil
wetland
sandy soil
drought
timescale
soil emission
drought stress
eddy covariance
desertification
water storage
nitrous oxide
water stress
loess
primary production
water management
silt
greenhouse gas

Keywords

  • Carbon balance
  • Eddy covariance Grasslands
  • Greenhouse gas balance
  • Interannual variation
  • Net biome production
  • Soil type

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Nagy, Z., Barcza, Z., Horváth, L., Balogh, J., Hagyó, A., Káposztás, N., ... Pintér, K. (2011). Grasslands. In Atmospheric Greenhouse Gases: The Hungarian Perspective (pp. 91-119). Springer Netherlands. https://doi.org/10.1007/978-90-481-9950-1_6

Grasslands. / Nagy, Z.; Barcza, Z.; Horváth, L.; Balogh, János; Hagyó, Andrea; Káposztás, Noémi; Grosz, Balázs; Machon, Attila; Pintér, Krisztina.

Atmospheric Greenhouse Gases: The Hungarian Perspective. Springer Netherlands, 2011. p. 91-119.

Research output: Chapter in Book/Report/Conference proceedingChapter

Nagy, Z, Barcza, Z, Horváth, L, Balogh, J, Hagyó, A, Káposztás, N, Grosz, B, Machon, A & Pintér, K 2011, Grasslands. in Atmospheric Greenhouse Gases: The Hungarian Perspective. Springer Netherlands, pp. 91-119. https://doi.org/10.1007/978-90-481-9950-1_6
Nagy Z, Barcza Z, Horváth L, Balogh J, Hagyó A, Káposztás N et al. Grasslands. In Atmospheric Greenhouse Gases: The Hungarian Perspective. Springer Netherlands. 2011. p. 91-119 https://doi.org/10.1007/978-90-481-9950-1_6
Nagy, Z. ; Barcza, Z. ; Horváth, L. ; Balogh, János ; Hagyó, Andrea ; Káposztás, Noémi ; Grosz, Balázs ; Machon, Attila ; Pintér, Krisztina. / Grasslands. Atmospheric Greenhouse Gases: The Hungarian Perspective. Springer Netherlands, 2011. pp. 91-119
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KW - Interannual variation

KW - Net biome production

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