Design and validation of a spatially explicit simulation model for bottomland hardwood forests

Species composition in forests depends on the interaction of species traits and species availability. Yet many forest simulation models focus only on interactions of adult trees and saplings, ignoring how species become members of the community. We modify a published forest model for bottomland hardwood forests (program SWAMP [Phipps, R.L., 1979. Simulation of wetlands forest vegetation dynamics. Ecol. Modell. 7, 257–288]) to make it spatially explicit and incorporate explicit seed production and dispersal algorithms. The resulting individual-based, spatially explicit forest simulator (YAFSIM) combines mechanistic seed dispersal with growth and mortality of trees to track forest dynamics over time. We describe the structure of the model and test its validity for dynamics in small bottomland hardwood patches in the Mississippi Alluvial Valley. Dynamics of species composition and basal areas of trees predicted by Yazoo Forest Simulator (YAFSIM) were similar to those of natural second- and old-growth bottomland forests. However, diversity of simulated forest patches declined over time largely because of random dynamics acting on small, isolated populations.

[1]  C. Oliver.  Forest development in North America following major disturbances , 1980 .

[2]  E. Schupp.  The Janzen-Connell Model for Tropical Tree Diversity: Population Implications and the Importance of Spatial Scale , 1992, The American Naturalist.

[3]  J. Connell.  On the role of the natural enemies in preventing competitive exclusion in some marine animals and in rain forest trees , 1971 .

[4]  D. Botkin.  Forest Dynamics: An Ecological Model , 1993 .

[5]  Tim Nuttle,et al.  Seed Dispersal in Heterogeneous Environments: Bridging the Gap between Mechanistic Dispersal and Forest Dynamics Models , 2005, The American Naturalist.

[6]  James A. Allen,et al.  A Guide to Bottomland Hardwood Restoration , 2001 .

[7]  J. S. Meadows,et al.  An Old-Growth Definition for Eastern Riverfront Forests , 1996 .

[8]  Simon A. Levin,et al.  A Theoretical Framework for Data Analysis of Wind Dispersal of Seeds and Pollen , 1989 .

[9]  A. Prasad,et al.  Atlas of current and potential future distributions of common trees of the eastern United States , 1999 .

[10]  James S. Clark,et al.  STAGES AND SPATIAL SCALES OF RECRUITMENT LIMITATION IN SOUTHERN APPALACHIAN FORESTS , 1998 .

[11]  Wesley Rodrigues Silva,et al.  Mechanistic models for tree seed dispersal by wind in dense forests and open landscapes. , 2002 .

[12]  Andrew W. Ezell,et al.  Afforestation of bottomland hardwoods in the Lower Mississippi Alluvial Valley: Status and trends , 2001, Wetlands.

[13]  P. Harcombe,et al.  Woody seedling dynamics in an east Texas floodplain forest. , 1989 .

[14]  J. Chave.  Study of structural, successional and spatial patterns in tropical rain forests using TROLL, a spatially explicit forest model , 1999 .

[15]  S. Levin,et al.  Mechanisms of long-distance dispersal of seeds by wind , 2002, Nature.

[16]  Michael Power,et al.  The predictive validation of ecological and environmental models , 1993 .

[17]  Annabel Porté,et al.  Modelling mixed forest growth: a review of models for forest management , 2002 .

[18]  D. Greene,et al.  LONG-DISTANCE WIND DISPERSAL OF TREE SEEDS , 1995 .

[19]  W. Smith,et al.  A Workshop to Resolve Conflicts in the Conservation of Migratory Landbirds in Bottomland Hardwood Forests , 1994 .

[20]  Ran Nathan,et al.  FIELD VALIDATION AND SENSITIVITY ANALYSIS OF A MECHANISTIC MODEL FOR TREE SEED DISPERSAL BY WIND , 2001 .

[21]  D. Greene,et al.  Wind Dispersal of Seeds from a Forest Into a Clearing , 1995 .

[22]  F. Burrows.  CALCULATION OF THE PRIMARY TRAJECTORIES OF DUST SEEDS, SPORES AND POLLEN IN UNSTEADY WINDS , 1975 .

[23]  D. Murrell,et al.  The Community-Level Consequences of Seed Dispersal Patterns , 2003 .

[24]  Thomas M. Smith,et al.  Scale and resolution of forest structural pattern , 1988, Vegetatio.

[25]  H. Shugart.  A Theory of Forest Dynamics , 1984 .

[26]  G. Nowacki,et al.  An Old-Growth Definition for Seasonally Wet Oak-Hardwood Woodlands , 1997 .

[27]  Richard L. Phipps,et al.  Simulation of wetlands forest vegetation dynamics , 1979 .

[28]  Wesley Rodrigues Silva,et al.  Seed dispersal and frugivory : ecology, evolution, and conservation , 2002 .

[29]  S. Pacala,et al.  SEEDLING RECRUITMENT IN FORESTS: CALIBRATING MODELS TO PREDICT PATTERNS OF TREE SEEDLING DISPERSION' , 1994 .

[30]  George C. Hurtt,et al.  Reid's Paradox of Rapid Plant Migration Dispersal theory and interpretation of paleoecological records , 1998 .

[31]  D. Janzen.  Herbivores and the Number of Tree Species in Tropical Forests , 1970, The American Naturalist.

[32]  G. Varley,et al.  Dynamics of Populations , 1973 .

[33]  D. Greene,et al.  A MODEL OF WIND DISPERSAL OF WINGED OR PLUMED SEEDS , 1989 .

[34]  J. Walker,et al.  Ecological Field Theory: the concept and field tests , 1989, Vegetatio.

[35]  James A. Young,et al.  Seeds of woody plants in North America , 1993 .

[36]  Mark R. Fulton,et al.  Patterns in height-diameter relationships for selected tree species and sites in eastern Texas , 1999 .

[37]  Yuan Ji,et al.  Fecundity and Dispersal in Plant Populations: Implications for Structure and Diversity , 1995, The American Naturalist.

[38]  Emile S. Gardiner,et al.  Restoring Bottomland Hardwood Ecosystems in the Lower Mississippi Alluvial Valley , 2000, Journal of Forestry.

[39]  D. Steven.  Experiments on Mechanisms of Tree Establishment in Old-Field Succession: Seedling Survival and Growth , 1991 .

[40]  S. Pacala,et al.  Forest models defined by field measurements : Estimation, error analysis and dynamics , 1996 .

[41]  S. Hubbell,et al.  The unified neutral theory of biodiversity and biogeography at age ten. , 2011, Trends in ecology & evolution.