Beta diversity at different spatial scales: plant communities in organic and conventional agriculture.

摘要: Biodiversity studies that guide agricultural subsidy policy have generally compared farming systems at a single spatial scale: the field. However, diversity patterns vary across scales. Here, we examined effects of system (organic vs. conventional) and position in field (edge center) on plant species richness wheat fields three We quantified α-, β-, γ-diversity microscale 800 plots, mesoscale 40 fields, macroscale regions using additive partitioning approach, evaluated relative contribution β-diversity each scale to total observed richness. found were higher organic than conventional edge center all In both systems, meso- explained most overall (up 37% 25%, respectively), indicating considerable differences...