Results (
Thai) 1:
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Our previous experiment that combined three earthworm specieswith three soil types showed that cast properties interactively dependon soil types and on earthworm species (Clause et al., 2014). Casts ofanecicLumbricus terrestris had higher NH4+and P contents than castsof endogeic Aporrectodea caliginosa and Allolobophora chlorotica inthe Luvisol, Rendosol and Histosol soils. On the otherhand, casts of L.terrestris had a lower C:N ratio than the two endogeic species in theLuvisol. Casts of A. chlorotica had a higher Mg content in theRendosol but not in the two other soil types. These differences incast properties between soil types and earthworm species likelyimpact the response of seeds and seedlings that germinate in casts.Onlyone attempt has been made at assessing the respective impactsof ingestion and cast properties (Eisenhauer et al., 2009). It showedthat seed ingestion by earthworms mostly increased seedgermination, although the effect varied with plant species, andthat earthworm casts alone—from one type of soil—primarilydecreased the germination (Eisenhauer et al., 2009).
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