Comparative analysis of eight neotropical savanna ecosystems: production-decomposition indexes
Neotropical savanna ecosystems
Polish Academy of Sciences. Institute of Ecology
Polish Academy of Sciences. Institute of Ecology. Publishing Office
Pages 339-358 : illustrations ; 27 cm
Bibliographical references (pages 356-358)
Comparative studies of the functioning of eight neotropical savannas were conducted in Venezuela and Panama. Savannas were classified in the following 4 types of increasing productivity: Trachypogon savanna, ''Bajio" savanna, Paspalum savanna and Hyparrhenia savanna. Each savanna type was reprezented by sites ungrazed or grazed by cows. All stands, except for the flooded "Bajio" were burnt at the end of the rainy season. The rates of two ecosystem processes were measured: productivity (NPP) and decomposition. The index of productivity was the maximum biomass of ABVG (above ground biomass) and BLG (below ground mass of roots); this was measured at the end of the rainy season just before the fire. Decomposition rate was evaluated using litterbags with local litter or filter paper exposed in different layers of savannas. ABVG production of biomass is highest in non-grazed Hyparrhenia savanna, where it reaches 19-20 g d.w.m-2 daily and 2850-2950g d.w.m-2 in the rainy season. This is a very high figure rarely noted in grasslands. The lowest productivity -544 g d.w.m-2 ABVG in the rainy season - was noted in Trachypogon savannas. Roots constitute a small part of savanna biomass: 14-25% in Hyparrhenia savanna, and 6-45% in Venezuelan savannas. The biomass of roots is concentrated in the 0-10cm layer: 86-90% in Hyparrhenia, 40-72% in Venezuelan savannas. The decomposition of litter evaluated for 6 Venezuelan savannas and calculated for the wet season ranges from 180 to 1126 g d.w.-2. Higher decomposition occur in stands with higher productivity. To the new findings can be assigned the results of comparative measures of decomposition on four levels (from soil to 40 cm above the ground surface). In the Hyparrhenia stand as much as 52% of decomposition takes place in the standing plants. The OM budget calculations suggest that all 8 stands are characterized by an accumulation of organic matter; however, decomposition rate is underestimated as the fraction of OM decomposed in standing plants is not considered.
Polish Journal of Ecology
MiIZ PAN, call no. P.2840
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Ekologia Polska (1953-2011)
Ekologia Polska, późn. tyt.: Polish Journal of Ecology (t. 1-51)
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Nr 1. On the scale dependence of evenness / Ulrich W.
Nr 2. A comparative study of the life strategies of two bacterial-feeding nematodes under laboratory conditions. 2 / Ilieva-Makulec K.
Nr 2. A comparative study of the life strategies of two bacterial-feeding nematodes under laboratory conditions. 3 / Ilieva-Makulec K.
Nr 2. Models of relative abundance distributions. 1, Model fitting by stochastic models / Ulrich W.
Nr 2. Models of relative abundance distributions. 2, Diversity and evenness statistics / Ulrich W.
Nr 3. Nematodes colonizing power plant ash dumps. 1, Soil nematodes in ash dumps non-reclaimed and reclaimed by adding mineral soil and sowing grass / Dmowska E.
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Nr 3. Estimating species numbers by extrapolation: a cautionary note / Ulrich W.
Nr 4. Influence of leaf area on atmospheric input of elements to the ecosystems of the Kampinos National Park (Central Poland) / Kram K. J.
Nr 4. Comparative analysis of eight neotropical savanna ecosystems: production-decomposition indexes / Breymeyer A. I.
Nr 4. Effects of the density of larvae and type of substrate on Chironomus plumosus L. (Diptera: Chironomidae) population. Laboratory experiments / Kajak Z., Prus P.
Nr 4. Ecological characteristics of rare species: the case of parasitic Hymenoptera / Ulrich W.
Nr 4. Relative abundance distributions of species: the need to have a new look at them / Ulrich W.
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Nr 4. Comparison of Collembola (springtails) communities in meadows and forests on drained peat soils of different origin / Kaczmarek M.
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Ekologia Polska, późn. tyt.: Wiadomości Ekologiczne (t. 1-57)