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6 International Agrophysics

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Effect of soil sieving on respiration induced by low-molecular-weight substrates

100%

Datta R. , Vranova V. , Pavelka M. , Rejsek K. , Formanek P.

International Agrophysics

2014

tom 28

nr 1

The mesh size of sieves has a significant impact upon soil disturbance, affecting pore structure, fungal hyphae, proportion of fungi to bacteria, and organic matter fractions. The effects are dependent upon soil type and plant coverage. Sieving through a 2 mm mesh increases mineralization of exogenously supplied carbohydrates and phenolics compared to a 5 mm mesh and the effect is significant (p<0.05), especially in organic horizons, due to increased microbial metabolism and alteration of other soil properties. Finer mesh size particularly increases arabinose, mannose, galactose, ferulic and pthalic acid metabolism, whereas maltose mineralization is less affected. Sieving through a 5 mm mesh size is suggested for all type of experiments where enhanced mineralization of low-molecular-weight organic compounds needs to be minimalized.

Forest ecosystem as a source of CO2 during growing season: relation to weather conditions

86%

Taufarova K. , Havrankova K. , Dvorska A. , Pavelka M. , Urbaniak M. , Janous D.

International Agrophysics

2014

tom 28

nr 2

Net ecosystem production reflects the potential of the ecosystem to sequestrate atmospheric CO2. Daily net ecosystem production of a mountain Norway spruce forest of the temperate zone (Czech Republic) was determined using the eddy covariance method. Growing season days when the ecosystem was a CO2 source were examined with respect to current weather conditions. During the 2005, 2006, and 2007 growing seasons, there were 44, 65, and 39 days, respectively, when the forest was a net CO2 source. The current weather conditions associated with CO2 release during the growing seasons were: cool and overcast conditions at the beginning or end of the growing seasons characterized by a 3-year mean net ecosystem production of -7.2 kg C ha-1 day-1; overcast or/and rainy days (-23.1 kg C ha-1 day-1); partly cloudy and hot days (-11.8 kg C ha-1 day-1); and overcast and hot days (-13.5 kg C ha-1 day-1). CO2 release was the highest during the overcast or/and rainy conditions (84%, average from all years), which had the greatest impact during the major production periods. As forests are important CO2 sinks and more frequent weather extremes are expected due to climate change, it is important to predict future forest carbon balances to study the influence of heightened variability in climatic variables.

Soil-meteorological measurements at ICOS monitoring stations in terrestrial ecosystems

51%

Op de Beeck M. , Gielen B. , Merbold L. , Ayres E. , Serrano-Ortiz P. , Acosta M. , Pavelka M. , Montagnani L. , Nilsson M. , Klemedtsson M. , Vicke C. , De Ligne A. , Moureaux C. , Maranon-Jimenez S. , Saunders M. , Mereu S. , Hortnagl L.

nr 4

Standardisation of chamber technique for CO2, N2O and CH4 fluxes measurements from terrestrial ecosystems

44%

Pavelka M. , Acosta R. , Kiese R. , Altimir N. , Brummer C. , Crill P. , Darenova E. , Fub R. , Gielen B. , Graf A. , Klemedtsson L. , Lohila A. , Longdoz B. , Lindroth A. , Nilsson M. , Maranon Jimenez S. , Merbold L. , Montagnani L. , Peichl M. , Pihlatie M. , Pumpanen J. , Serrano Ortiz P. , Silvennoinen H. , Skiba U. , Vestin P. , Weslien P. , Janous D. , Kutsch W.

nr 4

Ancillary vegetation measurements at ICOS ecosystem stations

37%

Gielen B. , Acosta M. , Altimir N. , Buchmann N. , Cessacti A. , Ceschia E. , Fleck S. , Hortangl L. , Klumpp K. , Kolari P. , Lohila A. , Loustau D. , Maranon-Jimenez S. , Manise T. , Matteucci G. , Merbold L. , Metzger C. , Moureaux C. , Montagnani L. , Nilsson M. B. , Osborne B. , Papale D. , Pavelka M. , Sounders M. , Simioni G. , Soudani K. , Sonnentag O. , Tallec T. , Tuittila E.-S. , Peichl M. , Pokorny R. , Vincke C. , Wohlfahrt G.

nr 4

ICOS eddy covariance flux-station site setup: a review

37%

Rebmann C. , Aubinet M. , Schmid H. , Arriga N. , Aurela M. , Burba G. , Clement R. , De Ligne A. , Fratini G. , Gielen B. , Grace J. , Graf A. , Gross P. , Haapanala S. , Herbst M. , Hortnagl L. , Ibrom A. , Joly L. , Kljun N. , Kolle O. , Kowalski A. , Lindroth A. , Loustau D. , Mamarella I. , Mauder M. , Merbold L. , Metzger S. , Molder M. , Montagnani M. , Papale D. , Pavelka M. , Peichl M. , Roland M. , Serano-Ortiz P. , Siebicka L. , Strinbrecher R. , Tuovinen J.-P. , Vesala T. , Wohlfahrt G. , Franz D.

nr 4