长春林科所,为了搞清种子园母树结实与土壤肥力的关系,自1984年以来在净月潭樟子松种子园内,选择同一无性系的27株母树为供试材料。分别在母树的萌动期、生长初期、幼果形成期和生长停止期分株采集土样。采样在距母树树干同一方向1米处进行,挖好土壤剖面,分层采样。土样经风干后,用常规分析法对全氮、全磷、速效钾、速效磷、pH值,含 Changchun Linke Institute, in order to find out the relationship between the seed-tree mother tree and soil fertility, since 1984, Jingyuetongzi pine seed orchard, select the same clonal 27 trees as the test material. The soil samples were collected from the ramets in the germination stage, early growth stage, young fruit formation stage and growth stop stage of the mother tree. Sampling in the same direction away from the tree trunk trunk 1 m, dug soil profiles, stratified sampling. Soil samples were dried, the conventional analysis of total nitrogen, total phosphorus, available potassium, available phosphorus, pH, containing