However, for a given %WSA, WHC was higher for A. Linear regression indicated a consistent relationship between increases in %WSA and WHC for both earthworm species. terrestris only caused a significant increase in WHC (of 11%) in the upper 6.5 cm of the sandy loam soil. Allobophora chlorotica treatments significantly increased WHC by 7–16%. terrestris, this increase was significantly greater in the upper 6.5 cm of the soil where their casts were more obviously present. ![]() Earthworms significantly increased %WSA (by 16–56% and 19–63% relative to earthworm-free controls for L. We carried out mesocosm experiments using either the anecic earthworm Lumbricus terrestris or the endogeic earthworm Allolobophora chlorotica and loam, silt loam and sandy loam soils to investigate the differing impact of these earthworm of different ecotypes on aggregate formation (percentage water stable aggregates, %WSA) and soil water holding capacity (WHC), two soil properties that underpin many of the ecosystem services provided by soils.
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