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繁殖体压力对豚草(Ambrosia artemisiifolia)定殖和种群维持的影响

邓贞贞1,2,赵相健1,赵彩云1,李俊生1*
  

  1. (1中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012;  2中国人民大学环境学院, 北京 100872)
  • 出版日期:2016-06-10 发布日期:2016-06-10

The impact of propagule pressure on the successful colonization and population persistence of invasive weed Ambrosia artemisiifolia. #br#

DENG Zhen-zhen1,2, ZHAO Xiang-jian1,  ZHAO Cai-yun1, LI Jun-sheng1*#br#   

  1. (1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;  2 Renmin University of China, Beijing 100872, China).
  • Online:2016-06-10 Published:2016-06-10

摘要: 从北京门头沟收集入侵植物豚草(Ambrosia artemisiifolia)的种子,在北京顺义区休耕地上进行为期2年的田间实验。通过引入不同数量的豚草种子:5、10、20和40粒·m-2,研究不同繁殖体压力对入侵初期豚草出苗、定殖和种群维持的影响。结果表明:繁殖体压力大小对豚草成功定殖样方比例有显著影响,其中繁殖体压力达到20粒·m-2后所有样方均成功定殖且第二年种群继续扩大;种子引入第二年样方内豚草幼苗数和定殖植株数均显著高于第一年(P<0.05);第一年有1~3株豚草成功定殖的样方即可基本满足第二年豚草种群的维持,第二年成功出苗5~237株,定殖4~97株。以上结果表明,小批量豚草种子的传入即具有较大的入侵风险,且传入种子数量越多,风险越大;豚草在只有少数几株成功定殖的情况下就有极大可能产生足够多的种子以满足种群的维持和扩张。因此,在豚草的防控工作中,应加强对豚草种子的检疫,并且重视豚草新分布区零星植株的及时清除。

关键词: 大豆, 鼓粒期, 干旱胁迫, 光合能力, 根系生长

Abstract: Common ragweed (Ambrosia artemisiifolia) seeds were collected from Mentougou District, Beijing, China, and a field experiment was conducted in a fallow field in Shunyi District, Beijing, China, during 2013-2014. In order to evaluate the effect of propagule pressure on common ragweed’s recruitment, colonization and population persistence, four levels of common ragweed seeds (5, 10, 20 and 40 seeds·m-2) were sown in 12 plots. The results showed that there was a positive correlation between propagule pressure and the proportion of plots with common ragweed successfully recruited and colonized in both 2013 and 2014. When the propagule pressure reached or were more than 20 seeds·m-2, the population of common ragweed could be successfully established and even continued to expand next year. The number of common ragweed recruited and colonized in the plots in the second year was significantly higher than in the first year (P<0.05). The plots that had 1-3 seedlings successfully colonized in 2013 were able to maintain their population in 2014, in which the number of seedlings recruited in 2014 ranged from 5 to 237, and only 4 to 97 adult plants were successfully colonized at the end of the experiment. Results indicate that low propagule pressure of common ragweed can likely cause invasion, and the probability of successful colonization increased with propagule pressure; only a few plants of common ragweed may produce enough seeds for population persistence and expansion. As a result, it is necessary to strengthen the quarantine of common ragweed seeds and eliminate the few plants occurred in new distribution area in time.

Key words: soybean, grain filling stage, drought stress, photosynthetic capacity, root growth.