02/16/2023
Interesting study regarding wetland management.
14-Year Wetland Study
Archbold’s Buck Island Ranch is home to over 600 seasonal wetlands. These wetlands are embedded within intensively managed improved pastures (IMP) or extensively managed semi-native pastures (SNP). IMPs contain large ditch networks for drainage and non-native grass plantings that require fertilizer. In contrast, SNPs retain a majority of native vegetation and lower cow stocking. These contrasting environmental conditions affect the composition of wetland plant communities.
A new study published in the journal Ecological Applications by Dr. Gregory Sonnier, Archbold Assistant Research Biologist, Dr. Betsey Boughton, Archbold Agroecology Director, and previous intern Ruth Whittington, evaluated a 14-year data set to assess pasture management, livestock grazing, and prescribed fire impacts on wetland vegetation. The study (link below) showed that SNP wetlands had a higher number of native plant species, whereas IMP wetlands had lower overall diversity with a few dominant species and a significant proportion of non-native species.
The study also showed that 14 years of cattle exclusion and frequent prescribed fires were not enough to restore IMP wetlands highlighting the importance of not converting SNP to IMPs. In their study, grazing promoted plant species richness in both IMPs and SNPs because it allows short forbs to coexist with larger clonal grasses while controlling tree and shrub encroachment. They found a higher functional diversity (i.e., diversity in plant life history traits) in grazed wetlands because grazing selects different life history strategies.
They write, "To our knowledge, this represents one of the longest-running experiments testing the effects of cattle removal, management intensity, and prescribed fires on 40 whole wetlands."
https://esajournals.onlinelibrary.wiley.com/doi/10.1002/eap.2732
Caption: Wetland in semi-native pasture at Buck Island Ranch. Photo by Gregory Sonnier.
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