Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59, 183-190
Published online 2014-07-10

Soil microbial respiration beneath Stipa tenacissima L. and in surrounding bare soil

Irena Novosádová1, José Damian Ruiz-Sinoga2, Jaroslav Záhora3, Helena Fišerová4

1Zemědělský výzkum, spol. s r. o., Zahradní 1, 664 41 Troubsko, Česká republika
2Facultad de Filosofía y Letras, Departamento de Geografía, Universidad de Málaga, Campus universitario Teatinos S/N, 29071, Spain
3Ústav agrochemie, půdoznalství, mikrobiologie a výživy rostlin, Mendelova univerzita v Brně, 613 00 Brno, Česká republika
4Ústav biologie rostlin, Mendelova univerzita v Brně, 613 00 Brno, Česká republika

Open steppes dominated by Stipa tenacissima L. constitute one of the most representative ecosystems of the semi-arid zones of Eastern Mediterranean Basin (Iberian Peninsula, North of Africa). Ecosystem functioning of these steppes is strongly related to the spatial pattern of grass tussocks. Soils beneath Stipa tenacissima L. grass show different fertility and different microclimatic conditions than in surrounding bare soil. The objective of this study was to assess the effect of Stipa tenacissima L. on the key soil microbial activities under controlled incubation conditions (basal and potential respiration). Basal and potential microbial respirations in the soils beneath Stipa tenacissima L. were, in general, not significantly different from the bare soils. The differences were less than 10%. Significantly less ethylene produced by microbial activity in soils beneath Stipa tenacissima L. after the addition of glucose could indicate the dependence of rhizospheric microbial communities on available carbon compounds. It can be concluded, that the soil respiration in semi-arid Mediterranean ecosystems is not necessarily associated with the patchy plant distribution and that some microbial activities characteristics can be unexpectedly homogenous.


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