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Abstract
At the forest landscape/region level, based on annual Forest Inventory and Analysis plot data from 1999 to 2010, oak decline and mortality trends for major oak species (groups) were examined in the Ozark Highlands of Arkansas and Missouri. Oak decline has elevated cumulative mortality of red oak species to between 11 and 15 percent in terms of relative density and basal area of standing dead oak trees, respectively. These values are three to five times higher than for white oak group and non-oak species. Oak decline and associated escalating mortality have occurred primarily in red oak species while the white oak group has maintained a relatively stable mortality rate that is comparable to non-oak species. Cross-correlation analyses indicate that mortality in the red oak group was significantly correlated with the growing season Palmer drought severity index (PDSI) and usually lagged two to three years following single drought events. Moreover, based on the past 17 years PDSI data, it appears that the cumulative impacts of drought may last up to 10 years. The Ozark Highlands experienced a severe drought extending from 1998 to 2000 and another milder drought from 2005 to 2006. These drought events triggered the escalation of mortality starting around year 2000. Spatially, high red oak mortality sites (hot spots with proportional basal area mortality > 0.12) initially occurred in the central Ozarks and spread gradually over most of the Ozark Highlands as regional droughts continued. In contrast, sites with elevated white oak and non-oak mortality occurred sporadically, mainly in the southern portion (Arkansas) of the Ozark Highlands. During the most recent inventory period (2006–2010), over 60%, 7% and 5% of red oak, white oak and non-oak groups, respectively, had relative mortality rates of > 12%.
Highlights
IntroductionArkansas and southern Missouri has been gradually replaced by large contiguous blocks of high-density oak-hickory forests
Since the 1930s, the historical woodland-savanna-glade mosaic in the Ozark Highlands of northernArkansas and southern Missouri has been gradually replaced by large contiguous blocks of high-density oak-hickory forests
According to USDA Forest Service’s Forest Inventory and Analysis (FIA) database, approximately 98% of all scarlet oak volume, 83% of all black oak volume, and 54% all northern red oak volume found in Arkansas and Missouri occur in the Ozark Highlands
Summary
Arkansas and southern Missouri has been gradually replaced by large contiguous blocks of high-density oak-hickory forests. This is the result of extensive fire suppression and widespread application of other management practices that have relatively little impact on the forest overstory. According to USDA Forest Service’s Forest Inventory and Analysis (FIA) database, approximately 98% of all scarlet oak volume, 83% of all black oak volume, and 54% all northern red oak volume found in Arkansas and Missouri occur in the Ozark Highlands. Oak decline and mortality in red oak species occurred throughout the 1970s [4] and earlier [5] and is prevalent throughout the Ozarks Highlands as forests reach physiological maturity [6,7].
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