【摘要】 东部白松采种与种子调制试验的研究结果表明,同龄的东部白松采种树间的球果产量存在显著差异,球果大小、鲜重与树高、胸径无关,球果数量与树高、胸径存在正相关。因此,选取东部白松采种林时应选择立地条件好的阳坡地段,东部白松长势良好,林龄为20~35年生,并呈片状分布的林分。更多还原

【Abstract】 This article through the north American precious tree-Pinus strobus seedling and seed modulation test. The result showed that there was a significant difference in the yield of cones among the Pinus strobus of the same age, there was great significance for the establishment of the optimal tree index for the selection of the Pinus strobes; The size and fresh weight of cones have nothing to do with tree height and chest diameter, and the number of cones has a positive correlation with tree height and chest diameter,therefore, selection seedling forest of Pinus strobes should choose a sunny slope with good standing conditions of which grew well, the age was 20-35 a, also distributed in the form of slices. The high yield and good quality of the seeds of this branch have a guiding significance for the selection of the Pinus strobes.更多还原