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在更新伐阶段前更数量和组成决定了美国东北部若干混交栎林(Quercus spp.)演替林分的特性(Leffelman和 Hawley1925,Trimble 和 Hart 1961,Ward 1966)。所希望的更新数量和分布的变差在规定的更新措施中大部分是摸棱两可的(dilemma)
The more quantitative and compositional characteristics of the Quercus spp. Succession stand in the northeastern United States (Leffelman and Hawley 1925, Trimble and Hart 1961, Ward 1966) before the more recent cutting stage. The desired number of updates and variability in distribution are mostly dilemma in the prescribed update