土壤水分及风力强度对红砂繁殖方式的影响

Effect of Soil Moisture and Wind Strength on the Reproduction Modes of Reaumuria soongoric

红砂作为干旱、半干旱荒漠区的主要植被群落建群种,在维护荒漠区生态方面起着举足轻重的作用,目前由于自然因素和人为因素导致以红砂种群更新速度缓慢。通过设置对比试验,对制约兰州市北山红砂更新的2个主要生态因子展开研究,旨在揭示其与更新的相关关系。研究发现:在干旱生境下,红砂主要以无性繁殖为主,有性繁殖为次,在湿润生境条件下,无性繁殖和有性繁殖2种方式所占比例基本相当,但无性繁殖稍具优势;风的强弱对红砂无性繁殖影响很小,本研究没有观测到,而对群落有性繁殖个体产生影响,弱风条件下要比强风条件下高近一倍。

Reaumuria soongorica, as the main vegetation populations of arid and semi-arid desert region, plays an important role in the maintenance of ecological aspects of the desert area. At present, due to the natural factors and the human factors, the vegetation communities consisting primarily of Reaumuria soongorica slow down its update speed, even the populations have the phenomenon of recession. So, it is the current problems to solve, that how to promote the regeneration and update of the populations. In this study, two main ecological factors are studied by setting the contrast experiments. The study has intended to reveal the relationship among the two factors and the populations regeneration constraint the updates of Reaumuria soongorica in the North hill of Lanzhou City. The study found that： in the drought habitat, Reaumuria soongorica groups mainly reproduce in asexual model and the sexual reproduction second; in the moist habitat, asexual reproduction has a bit of advantage. In this study, it is not observed that the intensity of wind has minimal impact on the asexual reproduction. But only that the strength of the wind affected the individuals of sexual reproduction of the populations is observed, and the individuals are almost once high in the weak wind than in the strong wind.