Higher soil respiration under mowing than under grazing explained by biomass differences

Koncz, Péter and Balogh, János and Papp, Marianna and Hidy, Dóra and Pintér, Krisztina and Fóti, Szilvia and Katja, Klumpp and Nagy, Zoltán (2015) Higher soil respiration under mowing than under grazing explained by biomass differences. Nutrient Cycling in Agroecosystems, 103 (2). pp. 201-215. ISSN 1573-0867

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Different management practices may change the rate of soil respiration, thus affecting the carbon balance of grasslands. Therefore, we investigated the effect of grazing and mowing on soil respiration along with its driving variables (soil water content, soil temperature, above and below ground biomass, vegetation indices and soil carbon) in adjacent treatments (grazed and mowed) at a semi-arid grassland in Hungary (2011-2013). The average soil respiration over three years was higher in the mown (6.03±4.07 µmol CO2 m-2 s-1) than in the grazed treatment (5.29±3.50 µmol CO2 m-2 s-1). While soil water content and soil temperature did not differ between treatments, mowing resulted in 20 % higher soil respiration than grazing, possibly due to 17% higher average above ground biomass in the mowed than in the grazed treatment. Inclusions of vegetation index VIGreen in the soil respiration model in addition to abiotic drivers improved the explained Rs variance by 16% in the mowed and by 5% in the grazed site, respectively. VIGreen alone proved to be a simple and fast indicator of soil respiration (r2=0.31 at grazed, r2=0.44 at mowed site). We conclude that soil respiration is responsive to the combined effect soil water content, soil temperature, biomass and soil carbon content as affected by the management (grazing vs. mowing) practice.

Item Type: Article
Uncontrolled Keywords: grassland management, soil CO2 efflux, soil respiration models, vegetation indices
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Q Science / természettudomány > QK Botany / növénytan > QK30 Plant ecology. Plant ethology / növényökológia
S Agriculture / mezőgazdaság > S1 Agriculture (General) / mezőgazdaság általában > S590 Soill / Talajtan
Depositing User: Péter Koncz
Date Deposited: 12 Feb 2016 08:00
Last Modified: 04 Apr 2023 11:22

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