In forest modeling to estimate the volume of wood, artificial intelligence has been shown to be quite effi-cient, especi......

刨花楠胸径前期生长较慢，１０￣１５年生为生长高峰期；树高生长前期较快，２５年生后生长较慢，１０年生前为生长高峰期；材积生长１５年生前较慢，以后上升较快，４５￣５０年生......

１４ａ杉木造林密度试验的结果表明，不同造林密度对杉木林分生长有显著或极显著的影响。随着密度增加，林分的平均树高、胸径、单株材积和冠......