Object structure
Title:

Comparative analysis of eight neotropical savanna ecosystems: production-decomposition indexes

Subtitle:

Neotropical savanna ecosystems

Creator:

Breymeyer, Alicja I.

Contributor:

Polish Academy of Sciences. Institute of Ecology

Publisher:

Polish Academy of Sciences. Institute of Ecology. Publishing Office

Place of publishing:

Dziekanów Leśny

Date issued/created:

2001

Description:

Strony 339-358 : ilustracje ; 27 cm ; Bibliografia na stronach 356-358

Type of object:

Czasopismo/Artykuł

Subject and Keywords:

neotropical savannas ; grass production/decomposition ; decomposition of standing plants

Abstract:

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.

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Relation:

Polish Journal of Ecology

Volume:

49

Issue:

4

Start page:

339

End page:

358

Resource type:

Tekst

Detailed Resource Type:

Artykuł

Resource Identifier:

ISSN 1505-2249

Source:

MiIZ PAN, sygn. P.2840 ; click here to follow the link

Language:

eng

Language of abstract:

Rights:

Licencja Creative Commons Uznanie autorstwa 3.0 Polska

Terms of use:

Zasób chroniony prawem autorskim. [CC BY 3.0 PL] Korzystanie dozwolone zgodnie z licencją Creative Commons Uznanie autorstwa 3.0 Polska, której pełne postanowienia dostępne są pod adresem: ; -

Digitizing institution:

Muzeum i Instytut Zoologii Polskiej Akademii Nauk

Original in:

Biblioteka Muzeum i Instytutu Zoologii PAN

Projects co-financed by:

Program Operacyjny Polska Cyfrowa, lata 2014-2020, Działanie 2.3 : Cyfrowa dostępność i użyteczność sektora publicznego; środki z Europejskiego Funduszu Rozwoju Regionalnego oraz współfinansowania krajowego z budżetu państwa

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