If you intersperse one group of things with another or among another, you put or include the second things between or among the first things. Originally the intention was to intersperse the historical scenes with modern ones
If one group of things are interspersed with another or interspersed among another, the second things occur between or among the first things. bursts of gunfire, interspersed with single shots
The mixture of habitats in a patchwork pattern; high interspersion means a high ratio of edge to area, producing ecotones and therefore a situation favored by many species of wildlife; monocultures offer little or no interspersion