Managing forests for multiple ecosystem services such as timber, carbon, and biodiversity requires information on ecosystem structure and management characteristics. National forest inventory data are increasingly being used to quantify ecosystem services, but they mostly provide timber management and overstory data, while data on understory shrub and herbaceous diversity are limited. We obtained species richness and stand management data from relevant literature to develop a regression tree model that can be used to predict understory species richness from forest inventory data. Our model explained 57% of the variation in herbaceous species richness in the coastal plain pine forests of the southeastern USA. Results were verified using field data, and important predictors of herbaceous richness included stand age, forest type, time since fire, and time since herbicide-fertilizer application. This approach can make use of available forest inventories to rapidly and cost-effectively estimate understory species richness for subtropical pine forests.
References
[1]
Sader, S.; Hoppus, M.; Metzler, J.; Jin, S. Perspectives of Maine forest cover change from Landsat imagery and Forest Inventory Analysis (FIA). J. Forest. 2005, 103, 299–303.
Yemshanov, D.; McKenney, D.W.; de Groot, P.; Haugen, D.; Sidders, D.; Joss, B. A bioeconomic approach to assess the impact of an alien invasive insect on timber supply and harvesting: A case study with Sirex noctilio in eastern Canada. Can. J. For. Res. 2009, 39, 154–168, doi:10.1139/X08-164.
[4]
Heath, L.S.; Smith, J.E.; Woodall, C.W.; Azuma, D.L.; Waddell, K.L. Carbon stocks on forestland of the United States, with emphasis on USDA Forest Service Ownership. Ecosphere 2011, 2, 1–21.
[5]
Managing Forest Ecosystems, National Forest Inventories: Contributions to Forest Biodiversity Assessments; Chirici, G., Winter, G., McRoberts, R.E., Eds.; Springer: Heidelberg, Germany, 2011; p. 206.
[6]
Allen, A.W.; Bernal, Y.K.; Moulton, R.J. Pine plantations and Wildlife in the Southeastern United States: An Assessment of Impacts and Opportunities; US Department of the Interior National Biological Service Information and Technology Report 3; US Department of Interior: Washington, DC, USA, 1996; p. 32.
[7]
Baker, J.C.; Hunter, W.C. Effects of forest management on terrestrial ecosystems. In Southern Forest Resource Assessment; General Technical Report SRS-53; Wear, D.N., Greis, J.G., Eds.; USDA Forest Service Southern Research Station: Ashville, NC, USA, 2002; pp. 91–112.
[8]
Moore, S.E.; Allen, H.L. Plantation forestry. In Maintaining Biodiversity in Forest Ecosystems; Hunter, M.L., Jr., Ed.; Cambridge University Press: New York, NY, USA, 1999; pp. 400–433.
[9]
Palik, B.; Engstrom, R.T. Species composition. In Maintaining Biodiversity in Forest Ecosystems; Hunter, M.L., Jr., Ed.; Cambridge University Press: New York, NY, USA, 1999; pp. 65–94.
Attiwill, P.M. The disturbance of forest ecosystems: The ecological basis for conservative management. For. Ecol. Manage. 1994, 63, 247–300, doi:10.1016/0378-1127(94)90114-7.
[12]
Hedman, C.W.; Grace, S.L.; King, S.E. Vegetation composition and structure of southern coastal plain pine forests: an ecological comparison. For. Ecol. Manage. 2000, 134, 233–247, doi:10.1016/S0378-1127(99)00259-5.
[13]
Moore, W.H.; Swindel, B.F.; Terry, W.S. Vegetative response to prescribed fire in a north Florida flatwoods forest. J. Range Manage. 1982, 35, 386–389, doi:10.2307/3898325.
[14]
Iglay, R.B.; Leopold, B.D.; Miller, D.A.; Burger, L.W., Jr. Effect of plant community composition on plant response to fire and herbicide treatments. For. Ecol. Manage. 2010, 260, 543–548, doi:10.1016/j.foreco.2010.05.010.
[15]
Swindel, B.F.; Conde, L.F.; Smith, J.E. Effects of forest regeneration practices on plant diversity and succession in Florida ecosystems. In Annual Symposium Proceedings on Impacts of Intensive Management Practices; School of Forest Resources and Conservation, University of Florida: Gainesville, FL, USA, 1982; pp. 5–15.
[16]
Swindel, B.F.; Conde, L.F.; Smith, J.E. Successional changes in Pinus elliottii plantation following two regeneration treatments. Can. J. For. Res. 1986, 16, 630–636, doi:10.1139/x86-108.
[17]
Conde, L.F.; Swindel, B.F.; Smith, J.E. Plant species cover, frequency, and biomass: Early responses to clearcutting, chopping, and bedding in Pinus elliottii flatwoods. For. Ecol. Manage. 1983, 6, 307–318, doi:10.1016/0378-1127(83)90039-7.
[18]
Conde, L.F.; Swindel, B.F.; Smith, J.E. Plant species cover, frequency, and biomass: Early responses to clearcutting, burning, windrowing, discing, and bedding in Pinus elliottii flatwoods. For. Ecol. Manage. 1983, 6, 319–331, doi:10.1016/0378-1127(83)90040-3.
[19]
Miller, K.V.; Miller, J.H. Forestry herbicide influences on biodiversity and wildlife habitat in southern forests. Wildlife Soc. B 2004, 32, 1049–1060, doi:10.2193/0091-7648(2004)032[1049:FHIOBA]2.0.CO;2.
[20]
Moore, W.F. Effects of Chemical Site Preparation on Vegetative, Small Mammal, and Songbird Communities in the Georgia Sandhills. Master’s Thesis, University of Georgia, Athens, GA, USA, 1996.
[21]
Miller, J.H.; Boyd, R.S.; Edwards, M.B. Floristic diversity, stand structure, and composition 11 years after herbicide site preparation. Can. J. For. Res. 1999, 29, 1073–1083, doi:10.1139/x99-075.
[22]
Timilsina, N.; Escobedo, F.; Cropper, W.P., Jr.; Abd-Elrahman, A.; Brandeis, T.; Delphin, S.; Lambert, S. A framework for identifying carbon hotspots and forest management drivers. J. Environ. Manage. 2012.
[23]
Hart, S.A.; Chen, H.Y.H. Understory vegetation dynamics of North American boreal forests. Plant Sci. 2006, 25, 381–397.
[24]
Hagar, J.C. Wildlife species associated with non-coniferous vegetation in Pacific Northwest conifer forests: A review. For. Ecol. Manage. 2007, 246, 108–122, doi:10.1016/j.foreco.2007.03.054.
[25]
Marsland, S. Machine Learning: An Algorithmic Perspective; CRC Press: Boca Raton, FL, USA, 2009; p. 406.
[26]
McNab, W.H.; Avers, P.E. USDA Forest Service WO-WSA-5, 1994. Ecological Subregions of the United States, Available online: http://www.fs.fed.us/land/pubs/ecoregions/ (accessed on 4 September 2012).
[27]
Noss, R.F. Longleaf pine and wiregrass: Keystone components of an endangered ecosystem. Nat. Areas J. 1989, 9, 211–213.
[28]
Peet, R.K.; Allard, D.J. Longleaf Pine Vegetation of the Southern Atlantic and Eastern Gulf Coast Regions: A Preliminary Classification. P. In Proceedings of the 18th Tall Timbers Fire Ecology Conference on the Longleaf Pine Ecosystem: Ecology, Restoration, and Management, Tallahassee, FL, USA, 30 May–2 June, 1991; Hermann, S.M., Ed.; Tall Timbers Research Station: Tallahassee, FL, USA, 1993; pp. 45–82.
[29]
Myers, R. Fire and the dynamic relationship between Florida sandhill and sand pine scrub vegetation. B. Torrey Bot. Club. 1985, 112, 241–252, doi:10.2307/2996539.
[30]
Archer, J.K.; Miller, D.L.; Tanner, G.W. Changes in understory vegetation and soil characteristics following silvicultural activities in a southeastern mixed forest. J. Torrey Bot. Soc. 2007, 134, 489–504, doi:10.3159/07-RA-013.1.
[31]
Hebb, E.A.; Clewell, A.F. A remnant stand of old-growth slash pine in the Florida panhandle. B. Torrey Bot. Club 1976, 103, 1–9, doi:10.2307/2484742.
[32]
Brewer, J.S. Patterns of plant species richness in a wet slash-pine (Pinus elliottii) savanna. J. Torrey Bot. Soc. 1998, 125, 216–224, doi:10.2307/2997219.
[33]
Brudvig, L.A.; Damschen, E.I. Land-use history, historical connectivity, and land management interact to determine longleaf pine woodland understory richness and composition. Ecography 2011, 34, 257–266, doi:10.1111/j.1600-0587.2010.06381.x.
[34]
Harrington, T.B.; Edwards, M.B. Understory vegetation, resource availability, and litterfall responses to pine thinning and woody vegetation control in longleaf pine plantations. Can. J. For. Res. 1999, 29, 1055–1064, doi:10.1139/x99-118.
[35]
Harrington, T.B. Overstory and understory relationships in longleaf pine plantations 14 years after thinning and woody control. Can. J. For. Res. 2011, 41, 2301–2314, doi:10.1139/x11-140.
[36]
Provencher, L.; Litt, A.R.; Gordon, D.R. Predictors of species richness in northwest Florida longleaf pine sandhills. Conserv. Biol. 2003, 17, 1660–1671, doi:10.1111/j.1523-1739.2003.00416.x.
[37]
Miller, J.H.; Zutter, B.R.; Newbold, R.A.; Edwards, M.B.; Zedaker, S.M. Stand dynamics and plant associates of loblolly pine plantations to midrotation after early intensive vegetation management—A southeastern United States regional study. South. J. Appl. For. 2003, 27, 1–16.
[38]
Blake, P.M.; Hurst, G.A.; Terry, T.A. Response of vegetation and deer forage following application of hexazinone. South. J. Appl. For. 1987, 11, 176–180.
[39]
Boyd, R.S.; Freeman, J.D.; Miller, J.H.; Edwards, M.B. Forest herbicide influences on floristic diversity seven years after broadcast pine release treatments in central Georgia, USA. New For. 1995, 10, 17–37.
[40]
Brockway, D.G.; Lewis, C.E. Influence of deer, cattle grazing and timber harvest on plant species diversity in a longleaf pine bluestem ecosystem. For. Ecol. Manage. 2003, 175, 49–69, doi:10.1016/S0378-1127(02)00119-6.
[41]
Kush, J.S.; Meldahl, R.S.; Boyer, W.D. Understory plant community response after 23 years of hardwood control treatments in natural longleaf pine (Pinus palustris) forests. Can J. For. Res. 1999, 29, 1047–1054, doi:10.1139/x99-063.
[42]
Maliakal, S.K.; Menges, E.S.; Denslow, J.S. Community composition and regeneration of Lake Wales Ridge wiregrass flatwoods in relation to time-since-fire. J. Torrey Bot. Soc. 2000, 127, 125–138, doi:10.2307/3088690.
[43]
Lane, V.R.; Miller, K.V.; Castleberry, S.B.; Miller, D.A.; Wigley, T.B.; Marsh, G.M.; Mihalco, R.L. Plant community responses to a gradient of site preparation intensities in pine plantations in the Coastal Plain of North Carolina. For. Ecol. Manage. 2011, 262, 370–378, doi:10.1016/j.foreco.2011.03.043.
[44]
Freeman, J.E.; Jose, S. The role of herbicide in savanna restoration: Effects of shrub reduction treatments on the understory and overstory of a longleaf pine flatwoods. For. Ecol. Manage. 2009, 257, 978–986, doi:10.1016/j.foreco.2008.10.041.
[45]
Platt, W.J.; Carr, S.M.; Reilly, M.; Fahr, J. Pine savanna overstorey influences on ground-cover biodiversity. Appl. Veg. Sci. 2006, 9, 37–50, doi:10.1111/j.1654-109X.2006.tb00654.x.
[46]
Keddy, P.A.; Smith, L.; Campbell, D.R.; Clark, M.; Montz, G. Patterns of herbaceous plant diversity in southeastern Louisiana pine savannas. Appl. Veg. Sci. 2006, 9, 17–26, doi:10.1111/j.1654-109X.2006.tb00652.x.
[47]
Brockway, D.G.; Lewis, C.E. Long-term effects of dormant-season prescribed fire on plant community diversity, structure and productivity in a longleaf pine wiregrass ecosystem. For. Ecol. Manage. 1997, 96, 167–183, doi:10.1016/S0378-1127(96)03939-4.
[48]
Kirkman, K.; Mitchell, R.J.; Helton, R.C.; Drew, M.B. Productivity and species richness across an environmental gradient in a fire-dependent ecosystem. Am. J. Bot. 2001, 88, 2119–2128.
[49]
Glitzenstein, J.S.; Streng, D.R.; Wade, D.D. Fire frequency effects on Longleaf Pine (Pinus palustris P. Miller) vegetation in South Carolina and Northeast Florida USA. Nat. Area J. 2003, 23, 22–37.
[50]
Ruth, A.D.; Miller, D.L.; Jose, S.; Long, A. Effects of reintroduction of fire into fire suppressed coastal scrub and longleaf pine communities along the lower gulf coastal plain. Nat. Areas J. 2007, 271, 332–344.
[51]
Beckage, B.; Stout, I.J. Effects of repeated burning on species richness in a Florida pine savanna: A test of the intermediate disturbance hypothesis. J. Veg. Sci. 2000, 11, 113–122, doi:10.2307/3236782.
[52]
Gilliam, F.S.; Christensen, N.L. Herb-layer response to burning in pine flatwoods of the lower coastal plain of South Carolina. B. Torrey Bot. Club. 1986, 113, 42–45, doi:10.2307/2996233.
[53]
Fridley, J.D.; Peet, P.K.; Wentworth, T.R.; White, P.S. Connecting fine- and broad-scale species-area relationships of southeastern U.S. flora. Ecology 2005, 86, 1172–1177, doi:10.1890/03-3187.
[54]
Breiman, L.; Friedman, J.H.; Olshen, R.A.; Stone, C.G. Classification and Regression Trees; Wadsworth International Group: Belmont, CA, USA, 1984; p. 358.
[55]
Ripley, B.D. Pattern Recognition and Neural Networks; Cambridge University Press: Cambridge, UK, 1996; p. 415.
[56]
De’ath, G.; Fabricus, K.E. Classification and regression trees: A powerful yet simple technique for ecological data analysis. Ecology 2000, 81, 3178–3192, doi:10.1890/0012-9658(2000)081[3178:CARTAP]2.0.CO;2.
[57]
Oliver, C.D.; Larson, B.C. Forest Stand Dynamics; McGraw-Hill: New York, NY, USA, 1990; p. 544.
[58]
Holland, D.N.; Lilieholm, R.J.; Roberts, D.W. Economic trade-offs of managing forests for timber production and vegetative diversity. Can. J. For. Res. 1994, 24, 1260–1265, doi:10.1139/x94-165.
