Differences in plant species richness between fertility levels are minor, but species diversity, species evenness and pollen concentrations are greatest at intermediate nutrient content.
Ekki er mikill munur á tegundafjölda (e: species richness) við breytilegt næringarefnainnihald jarðvegs, en tegundafjölbreytni (e: species diversity), tegundajafnvægi (e: species evenness) og þéttleiki frjókorna (e: pollen concentration) eru mest þegar næringarefnainnihald jarðvegs er í meðallagi.