生态环境学报2016，Vol.25Issue(9)：1439-1445,7.DOI:10.16258/j.cnki.1674-5906.2016.09.003
入侵藤本薇甘菊对酸性土壤的适应性
The Adaptation ofMikania micrantha to Acid Soil
摘要
Abstract
Mikania micrantha is one of the world’s worst invasive plants. It is now widespread in the tropics and south subtropics of China. Here we try to reveal the adaptation ofM. micrantha to acid soil and aluminum toxicity by a set of experiments. Seed germination rate and seedling growth ofM. micrantha in soil with different pH values were tested; seed germination rates and seedling mortalities ofM. micrantha and other 5 weeds under different Al3+ stresses (0, 0.5, 1 and 2mmol∙L-1) were compared; and the contents of three microelements (Al, Mn and Fe) in the stems ofM. micrantha and other 19 species were compared. The results showed that: (1)M. micrantha seeds could germinate in soil with pH values of 3.6~7.9 and its seedlings grew best in soil with pH value of 4.3. Its seed germination rate declined with increasing soil pH value. (2) The germination rate ofM. micrantha seeds was not significantly different among groups when the concentration of Al3+ was not higher than2 mmol∙L-1. Seedling mortality indicated that Al-tolerance ofM. micrantha was not significantly higher than the other tested species. However, the diffenence amongM. micrantha populations is obvious, especially in seedling survival rate. (3) The content of Al in the stem ofM. micrantha was the highest (655.3 mg∙kg-1), 11.5 times of the mean value of the other 19 tested plants. The content of Fe was also the highest (309.9 mg∙kg-1), 3.3 times of the mean value of the other 19 tested palnts. The content of Mn (469.4 mg∙kg-1) was 2.7 times of the mean value of the other 19 tested plants. We concluded that M. micrantha has a wide ecological amplitude of soil pH. It is an Al-tolerant plant. The adaptability ofM. micrantha to acidic soil was favorable to its successful invasion in southern China. The exacerbated soil acidification in southern China may increase the risk of this species.关键词
薇甘菊/铝毒/土壤pH/种子萌发/幼苗生长/微量元素Key words
Mikania micrnatha/aluminum toxicity/soil pH/seedling growth/germination/microelement分类
农业科技引用本文复制引用
胡亮,邓太阳,张庆生,李鸣光..入侵藤本薇甘菊对酸性土壤的适应性[J].生态环境学报,2016,25(9):1439-1445,7.基金项目
国家自然科学基金项目（30370243）；宝安生态防护林防治薇甘菊试验的效益监测项目 （）
