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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
06/10/2008 |
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Data da última atualização: |
06/10/2008 |
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Autoria: |
NIEMINEN, M.; NUUTINEN, V.; TERHIVUO, J.; KETOJA, E.; SIRÉN, T. |
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Título: |
Soil properties, land use and the regional variation of earthworm communities in Finnish arable fields. |
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Ano de publicação: |
2008 |
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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. |
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Idioma: |
Inglês |
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Conteúdo: |
The structure of soil animal communities is shaped by both regional and local factors. In many
arable soils, earthworms form a key component in the soil animal community. Information of the
effects of soil management on earthworm communities in Finnish arable fields has been locally
available for long, but regional community patterns, as well as the importance of such key factors
as soil type on earthworm distribution, have remained poorly known. To fill these gaps of
knowledge, we did field surveys, ranging from the southern parts of the country to the Arctic
Circle, during autumns 2004 and 2005. We visited earlier established soil monitoring sites in
eleven research stations of MTT Agrifood Research Finland and sampled earthworms from 53
fields and 50 field boundaries. The information of cultivation history and soil data collected from
the sampling sites was used to explain the variation of earthworm communities. Most of the
fields were cultivated on cereals, silage or pasture. All sites located on mineral soils, with the
soil type ranging from clay to sand. Based on our results, the earthworm fauna of Finnish arable
fields consists of nine species: i.e. four epigeic species (Lumbricus rubellus, L. castaneus,
Dendrobaena octaedra, Dendrodrilus rubidus), four endogeic species (Aporrectodea caliginosa,
A. rosea, Octolasion tyrtaeum, Allolobophora chlorotica) and one anecic species (L. terrestris).
The three most common species were A. caliginosa, L. terrestris and L. rubellus. On average,
two earthworm species and 100 individuals m-2 were present in the field, while on average four
species and over 200 individuals m-2 were found at the field boundaries. This indicates the
potential of boundaries to act as source areas for earthworm dispersal into fields. In the field
sites, the abundance of earthworms varied from entirely empty sites (three fields) to sites, where
the abundance of earthworms was 1 000 and biomass more than 300 g m-2. Our analyses
show that among the variables describing soil properties and land use, soil type is by far the
best explanatory variable for earthworm total abundance, the densities being highest in medium
coarse soil types. The next phase of the study will involve the modelling of species distributions
and abundances. Also variables describing the landscape structure will be included into statistical
examination. MenosThe structure of soil animal communities is shaped by both regional and local factors. In many
arable soils, earthworms form a key component in the soil animal community. Information of the
effects of soil management on earthworm communities in Finnish arable fields has been locally
available for long, but regional community patterns, as well as the importance of such key factors
as soil type on earthworm distribution, have remained poorly known. To fill these gaps of
knowledge, we did field surveys, ranging from the southern parts of the country to the Arctic
Circle, during autumns 2004 and 2005. We visited earlier established soil monitoring sites in
eleven research stations of MTT Agrifood Research Finland and sampled earthworms from 53
fields and 50 field boundaries. The information of cultivation history and soil data collected from
the sampling sites was used to explain the variation of earthworm communities. Most of the
fields were cultivated on cereals, silage or pasture. All sites located on mineral soils, with the
soil type ranging from clay to sand. Based on our results, the earthworm fauna of Finnish arable
fields consists of nine species: i.e. four epigeic species (Lumbricus rubellus, L. castaneus,
Dendrobaena octaedra, Dendrodrilus rubidus), four endogeic species (Aporrectodea caliginosa,
A. rosea, Octolasion tyrtaeum, Allolobophora chlorotica) and one anecic species (L. terrestris).
The three most common species were A. caliginosa, L. terrestris and L. rubellu... Mostrar Tudo |
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