Changes in trees, groundlayer diversity, and deer-preferred plants across 18 years in oak (Quercus, Fagaceae) forests of northwestern Ohio1,2

Abella, Scott R.; Menard, Karen S.; Schetter, Timothy A.; Gallaher, Timothy D.

doi:10.3159/torrey-d-19-00047

Cited by 2 publications

(1 citation statement)

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“…A threshold for maximal savanna groundlayer plant cover and species richness was below 10–13 m 2 /ha basal area of trees (≥10 cm in diameter), or a third the amount typically in closed-canopy oak forests around the study area (Abella et al 2020b). The threshold for tree density was below 100–200 trees/ha.…”

Section: Discussionmentioning

confidence: 99%

Changes in Groundlayer Communities with Variation in Trees, Sapling Layers, and Fires during 34 Years of Oak Savanna Restoration

Abella,

Sprow,

Menard

et al. 2023

Natural Areas Journal

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Like many open habitats, sustainability of oak savannas in midwestern North America depends on periodic disturbances such as fires to curtail encroachment by tall woody plants. An uncertainty in restoring and sustaining oak savannas is how frequently fires must occur to maintain the groundlayer plant diversity savannas are known for and what levels of tree canopy and sapling layer encroachment trigger shifts in groundlayers. In an oak savanna undergoing restoration in northwestern Ohio, we examined how groundlayers changed with temporal variation in tree (≥10 cm in diameter) and sapling (<10 cm) layers and prescribed fires by remeasuring permanent plots up to 17 times from 1988 to 2021. Groundlayer cover was maximized when tree basal area was <13 m2/ha (35% tree canopy cover), there were fewer than 100 trees/ha, and fire had occurred since the previous growing season. Illustrating attrition in groundlayers above these thresholds, two-thirds of savanna groundlayer cover disappeared when tree density exceeded 100/ha and over 2 y passed without fires. Through savanna species persisting at low cover, species richness endured longer between fires (4+ years), doubled during periods with at least one fire in 3 y, and increased by a third when saplings were sparse (<80 stems/ha). Savanna groundlayers during the 34 y study fluctuated with intermittent increases and decreases associated with dynamics in trees, saplings, and time since fire. Although they require a major commitment because their benefits are so transient, frequent, low-severity prescribed fires appear capable of sustaining savanna groundlayer diversity indefinitely under prevailing conditions.

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Section: Discussionmentioning

confidence: 99%