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Clearcut size limitations established both for private land and public land may affect and compound the fragmentation of forested landscapes. To better understand hew these restrictions influence forest fragm,entation, we designed an experiment te test and assess the effects caused by different maximum clearcut size restrictions on landscapes with diffet"ent spa ial patterns of land ownership. Nrst, we developed forest plans with wood-flow and elearcut size constraints, using datasets composed of different land sizes (small, medium, and large) ancl spatial patterns (clumped, ispersed, and random). Six reasonable maximum clearcut sizes were assumecl for industrial landowners of the southern U,S, Landscape metrics were selected as indicators of forest fragmentation; these includecl number of patches, patch density total edge, edge density, perirneterLarea fracta1 dimension, mean proximity) contagion. Results how that regardless of 'forest size and spatial pattern o'E land ownership, as the maximum clearcut size inereased the number of patehes, patch densityl tota1 edge and edge density decreased, while mean proximity increased. Results also suggest that wood-fiow constraints have an effeet on measures of fragmentation, and by adding this type of constraint to a forest planning problem, the ef,fects attributable to different clearcut size restrictions may be mitigated. Keytvords: Landscape metrics, simulated annealing, comparison, edge density harvest scheduling,multivariate analysis of variance, multiple INTRODUCTION lhe role ef forestlands in many areas of the Unlted States has shfted from mainly providing commodities to providing multiple functions, including aesthetic values, environmental protection, biodiversity} and wildlife habitat censervatien, As a result, more attention is now paid to the impact of harvesting activities on other resources when developing forest plans. 'Iherefore, the outcemes of a forest plan now commonly include levels of timber production as well as estimates of the impact of harvest activities on the broader ecological system. 1[he context in which forest plans are develQped is important, as a number of wi1cllife conservation plans and habitat incentive programs in the United States contain goals related to the issue BEITTNGER and SEssroNs 2003), Recent insight in landscape ecology suggests that management aetions (e,g,, thinnings, clearcuts) influence human perception of forest fragmentation (GEoGHEGAN et at., 1997), in part because the spatial pattern of landscape f atures may affect ecologlcal processes occurring on the landscape CrtJRNER, 1989), CARsJENs and van LIER (2002) 'describe fragmentation as a process that spatially segregates landscape features that would normally neecl to belong in close proximity in order to function optimally Ferest edges created by management activities can be considered either beneficial or detrimental, depending on the wildlife species or context under consideration (KREMsAfrER and BuNNEiL, 1999). Ihe major irnpacts of forest hagmentation are on wildlife species that are dependent on size and configuration of hahitat, Corresponding author: Pete Beuinger 'i School of Forest Resources, University of Maine, Orono, ME04469 E-mail:Rongxia-Li@umit.maine.edu '2Warnell School of Forestry and Natural Re sources, University ef Georgia, Athens, GA 30oo2, Phone: 70aM2-1187. Fax: 706542-8356. Email:pbeuinger@warnell.uga.edu J. Fb r.Plann, 15:81-98C20IO Japan Society of Forest Planning NII-Electronic Library Service apanSociety f orest lanning

Assessing Forest Fragmentation in Southern U.S. Industrial Forest Plans that Accommodate Different Clearcut Size Restrictions