Data/hora: 09/06/2024 07:30:51

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 23/09/2008
Data da última atualização: | 23/09/2008
Autoria: | BUTENSCHOEN, O.; SCHEU, S.
Título: | Interactions of litter diversity and decomposer diversity on nitrogen fluxes during litter decomposition- a microcosm study using 15N stable isotopes.
Ano de publicação: | 2008
Fonte/Imprenta: | In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.
Idioma: | Inglês

Conteúdo:

Past research on biodiversity mainly focused on the effect of plant species richness and its
control over plant biomass production. Little is known, however, about the relationship between
plant diversity/identity, in particular litter diversity/identity, decomposer diversity and key
ecosystem processes such as decomposition, carbon transformation, and nutrient mineralization,
vital components sustaining ecosystem functioning. The objective of the experiment was to
investigate immobilization/mobilization of nitrogen during the decomposition of litter mixtures of
four qualities from five biomes with and without decomposers.
In a full factorial design 300 microcosms (190 mm height, 110 mm inner diameter) were filled
with 100 g dry weight defaunated soil, and 300 microcosms with 80 g dry weight defaunated
and 20 g not defaunated sieved soil. 5 mg 15N-Ammonium -15N-Nitrat were added per
microcosm as a tracer. Litter of four qualities (broadleaf evergreen, deciduous slow decomp.,
deciduous fast decomp. and nitrogen fixer) separately from five biomes (sub arctic, boreal,
temperate, mediterranean and tropical) were added to establish the single, two, three and four
species treatment with in total 4 g dry weight litter per microcosm. Half of the microcosms were
designated for an intermediate harvest after 6 month, and the remaining will be harvested at the
end of the experiment end of 2008. Treatments were replicated two times; 600 microcosms =
15 (litter mixture) x 2 (fauna +/-) x 2 (replicates) x 2 (time) x 5 (biomes). During the experiment
CO2 evolved in the microcosms was measured titrimetrically every week in the beginning, monthly
later. After 6 month of incubation remaining litter was collected, dry weight was determined and
litter was analysed for 15N and microbial biomass (SIR). Soil samples were taken and analysed
for 15N and microbial biomass (SIR). Soil and litter fauna were extracted and determined.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43666-1) - UPE - PL - -- - CD0305 -  -  - DIS