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近年来,由于人类生产生活的影响,以化肥农药使用为主的面源污染和以工业排放为主的点源污染日益加剧,全球尤其是海岸带氮含量逐渐升高,对滨海植被的生长产生了巨大的影响。在这个背景下,通过温室模拟实验研究不同供氮水平对互花米草的影响,对研究氮对入侵植物的影响作用机制有重大意义。互花米草在两种氮肥不同氮水平处理下,株高、叶面积、生物量等生长指标以及根冠比、根长/株高等指标的变化情况不同。结果表明:随着氮量增加,米草株高、叶面积、总生物量和地上部分生物量呈先上升后下降的趋势,地下部分生物量、根冠比和根长/株高比则呈下降趋势;各项指标在无机氮肥不同氮水平处理之间存在显著差异,但在有机氮肥的各处理间差异无显著性。这说明适当的供氮水平有利于互花米草的生长,而高氮则抑制其生长。
In recent years, due to the impact of human production and life, non-point source pollution mainly due to the use of chemical fertilizers and pesticides and point source pollution mainly caused by industrial emissions are increasingly aggravated. The nitrogen content in the coastal areas, especially the coast, is gradually increasing, A huge impact. In this context, the effects of different levels of nitrogen supply on Spartina alterniflora were studied through greenhouse simulation experiments, which is of great significance to study the effect of nitrogen on invasive plants. Spartina alterniflora under different nitrogen levels of two nitrogen fertilizers had different growth indexes such as plant height, leaf area and biomass as well as changes of root / shoot ratio and root length / plant height. The results showed that plant height, leaf area, total biomass and aboveground biomass tended to first increase and then decrease with the increase of nitrogen content. The underground biomass, root / shoot ratio and root length / plant height ratio The trend of the indexes was different among different nitrogen levels of inorganic nitrogen fertilizers. However, there was no significant difference among the treatments of organic nitrogen fertilizers. This shows that proper nitrogen level is conducive to the growth of Spartina alterniflora, while high nitrogen inhibits its growth.