Generally a higher lignin content in a particular wood species will result in lower movement or greater stability . 通常，木素含量高的某些树种，其胀缩较小或相当稳定。
This usually means a wider spacing than would be used in an ordinary commercial nursery for the same species . 这通常意味着要比正常生产性苗圃的同样树种采用较大的株行距。
Its native gymnosperms could evolve into a few species capable of growing in the warm, moist forests of queensland . 本地的裸子植物可进化成能在昆士兰温暖湿润林区的树种。
The efficiency of rubber farming is determined not just by the varieties of trees but also by the quality of the tapping . 橡胶生产的效率不仅决定于树种，而且还要决定于出胶质量。
When the same species occurs in the neighbourhood of an orchard, pollen will obviously infiltrate from the outside sources . 当种子园附近存在相同的树种时，花粉就会明显地从外部传来。
Another interesting generalization arose from the provenance tests of the four species mentioned in the previous section . 从前节所讨论的四个树种的种源试验中，还可得出另一有趣的规律。
Where forests are concerned, the difficulty is increased by the longevity and competitive capacity of dominant tree species . 只要哪里涉及森林，就由于优势树种的长命和竞争力而增加困难。
The history of the peach as a garden crop in china far antedates any claim that can be substantiated for other geographic areas . 在中国，桃作为一园艺树种，其历史远比任何其它已知的地区都早。
The species and clonal composition of an orchard will, therefore, influence the amount of selfed seed in the total seed yield . 因此，种子园的树种和无性系组成，会影响种子总产量中自交种子所占的数量。
This unique tree, among the tallest in the world, is native to a limited area along the pacific coast of northern california . 在世界上最高大的树木中，该树种首屈一指，这个树种，原产北加利福尼亚太平洋沿岸的有限地区。
