关键词: 离子束生物工程 药用植物 遗传改良, 离子束生物工程 药用植物 遗传改良

Abstract:

To discuss the regeneration characteristic of the dominant populations and different forest types’ influences on them, a systematic study on populations structure of Pinus tabulaeformis f. shekannesis and Quercus wutaishanica, as well as seedlings quantity in Pinus tabulaeformis f. shekannesis community on loess plateau were accomplished by using quadrat sampling method. The regeneration dynamics of populations and seedlings, the mortality and causes of seedlings were analyzed. The results showed that populations and seedlings of P. tabulaeformis f. shekannesis in pure and mixed forest, as well as Quercus wutaishanica population in pure forest appeared to distribute in an inversed ‘J’ shape, which indicated they were developing populations. Quercus wutaishanica in mixed forest was a grown up population, environmental conditions in the mixed forest were more suitable for the earlier seedlings but less for later growth. The density of P. tabulaeformis f. shekannesis seedlings was lower than that of Q. liaotungensis, the seedling bank of P. tabulaeformis f. shekannesis population in this area was also poor. Comparatively, P. tabulaeformis f. shekannesis population might be more suitable for the growth of Quercus wutaishanica.