From introduction: 'Forests found on interior Alaskan floodplains are some of the most productive in the taiga (Neiland and Vierick 1978), although they cover only a small portion of the total 45,900,000 ha of boreal forest in the interior Alaska. The high primary productivity of these forests is partially a function of the frequent flooding of the rivers, which results in a dynamic equilibrium between active erosion and alluvial bar formation. Bar formation shapes the terraces on which primary succession proceeds. Silt deposited by flooding buries organic layers, provides the mineral soil seedbed required for woody plant establishment, and add nutrients to the soil (Gill 1973, Brady et al. 1979). The high rates of sediment deposition associated with frequent flooding inhibit the establishment of some floodplain species (Walker et al. 1986).'