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period. The samples were hand sorted. The found earthworms were fixed and kept in<br />
formalin. Data on soil characteristics are summarized in Table 2.1.<br />
Table 2.1<br />
Chemical characteristics and granulometry of soils upper layer (0-20 cm) in<br />
sample plots<br />
Sample sites pH KCl<br />
Baldone<br />
(pasture)<br />
Baldone K<br />
(pasture)<br />
Dobele 1 (intensively<br />
cultivated)<br />
Dobele 2 (intensively<br />
cultivated)<br />
Priekuļi 1 (intensively<br />
cultivated)<br />
Priekuļi 2 (intensively<br />
cultivated)<br />
Organic<br />
matter %<br />
Physical<br />
clay %<br />
Granulometry<br />
of soils<br />
5,5 3,2 9 Sandy<br />
5,2 89 - Peat<br />
7,2 1,4 29 Loamy<br />
7,2 2,4 23 Loamy<br />
5,4 1,8 19 Sandy loam<br />
4,5 1,9 19 Sandy loam<br />
2.2. Factors effecting earthworm density and community structure in the<br />
monitoring sampling plots<br />
The data obtained in agricultural land monitoring observation areas<br />
demonstrate, that the most appropriate habitual environment for earthworms in<br />
Latvia is in loamy soils. In particular areas of Dobele sampling plots, density of<br />
earthworms extended even 300 worms m -2 . In the sandy loam soils of Priekuli, it is<br />
considerably less. Relatively high density is also in the sandy soils of Baldone, but it<br />
is considerably less in the peat soils (Figure 2.1, Table 2.2).<br />
15
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