摘要
论述了优树选择应遵循优良种源区选择优良林分 ,优良林分中选择优良单株的系统选择原则。提出了标准差法选择方法和标准 ,要求优树胸径大于林分平均胸径加 2倍标准差 ,且优树年平均生长量 :胸径大于 0 .9cm、树高大于 0 .5m。根据 1 9株人工林优树周围的标准地每木实测数据 ,对小标准地法和大树选优法作了比较 ;根据 32株优树的选优结果 ,比较了1 - 5株大树法选优法之间的相关关系 ,大树法间相关都显著 ,但以 3株法为最好 ;对选择的773株优树数量指标作了比较 ,对不同种子区选优标准提出了建议。
The selection principle is selecting stand from fine seed source and from them selecting fine individuality.Methods for the selection of with sample plots and check trees were compared on the basis of 19 sample plots.Comparisons of 1~5 check trees with 32 plus trees were made.The correlation between the 1~5 check trees methods was significant.The parameters of sample plots could be estimated by using data of check trees while the 3 check trees were the most efficient.Criteria of plus tree selection for each seed cone were suggested according to the data of 773 plus trees.
出处
《西北植物学报》
CAS
CSCD
2000年第5期720-726,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
陕西省科委"九五"科技攻关项目!( 96K0 5-G5)
关键词
优树
优树选择
油松
plus tree
selection of plus tree
Pinus tabulaeformis
