@misc{Nowak_Ewa_Population_1975,
 author={Nowak, Ewa},
 editor={Polska Akademia Nauk. Instytut Ekologii},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 howpublished={online},
 year={1975},
 language={eng},
 abstract={The numbers and biomass of earthworms were assessed in five grassland environments differing by the way of their utilization. A comparison of the species composition of the earthworm communities has shown that agricultural activities (mowing, grazing) lead to a decrease in the diversity of the community. There were 9 species present in a reserve meadow and 5 in pastures. The production of the dominant earthworm species, Allolobophora caliginosa Sav., in a grazed pasture (of a low primary production) was about 12 kcal/m2 per year, in a former sheep-fold pasture (with a high primary production) – about 58 kcal/m2 per year, the turnover being 1.3 and 0.9, respectively. The biomass of the entire earthworm community was found to represent from 0.4% of the organic matter returned to the soil in the grazed pasture, to 2.4% in the former sheep-fold pasture.},
 type={Text},
 title={Population density of earthworms and some elements of their production in several grassland environments},
 URL={http://rcin.org.pl/miiz/Content/73808/PDF/WA058_86700_P2840-T23_Eko-Pol-A-Nr-3.pdf},
 volume={23},
 number={3},
 journal={Ekologia Polska},
 publisher={Polish Scientific Publishers},
 keywords={earthworms, population, ecology, species composition, Lumbricidae},
}