Data from: Native-exotic richness relationship in Michigan prairies

A better understanding of factors underlying positive correlations between
native and exotic species richness, a pattern that is nearly ubiquitous at
large scales in plant communities, may help managers modify these
correlations to favor native plant species during restoration. Across 29
tallgrass prairie sites restored through seed sowing onto former
agricultural lands, we examined whether the relationship between native
and exotic richness is: 1) altered by management, such as seed additions
and prescribed fire, 2) controlled instead by environmental conditions and
successional processes, or 3) altered by management in certain
environments and not in others. Two datasets. Both contain exotic and
native plant SR across several prairie restorations, as well as data on
seed mix properties (mix richness, seeding rate), fire frequency, age of
restoration. "BassettNativeExoticData" contains data on
additional factors that influence invasion: environmental factors (PCA of
surrounding land use, tillage history, plant biomass, CV of plant biomass,
total vegetative cover, PCA of soil characteristics, CV of soil water
holding capacity, edge-area ratio).
"BassettNativeExoticData.mngmt" contains detailed data on seed
mixes (proportions of functional groups in seed mixes). Both raw and
standardized ([value-mean]/sd) values for most data.