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About 95% of swamp tupelo ( Nyssa sylvatica  var.  biflora  (Walt.) Sarg.) and sweetgum ( Liquidambar styraciflua  L.) seedlings survived continuous root flooding for more than two years, whereas none of the swamp chestnut oak ( Quercus michauxii  Nutt.) and cherrybark oak ( Q. falcata  var.  pagodifolia  Ell.) seedlings survived one year of flooding. Death of oak seedlings occurred in phases associated with periods of major vegetative growth, e.g., after bud burst in spring, after summer stem elongation, and during the winter deciduous stage, suggesting that stored reserves and sources were inadequate to maintain the seedlings when vegetative sinks were forming. Additional evidence that flooding induced a source deficiency in oak was that leaves of flooded oak were 65 to 75% smaller than leaves of nonflooded oak. Flooded swamp tupelo seedlings had a normal leaf size and patchy stomatal opening compared with nonflooded seedlings.

Long- and short-term flooding effects on survival and sink–source relationships of swamp-adapted tree species