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丛枝菌根真菌促进入侵植物紫茎泽兰的生长和对本地植物竞争效应

李立青1,2,张明生1,梁作盼2,肖博2,万方浩2,刘万学2*   

  1. 1贵州大学生命科学学院, 贵阳 550025; 2中国农业科学院植物保护研究所农业病虫害生物学国家重点实验室, 北京 100193)
  • 出版日期:2016-01-10 发布日期:2016-01-10

Arbuscular mycorrhizal fungi enhance invasive plant, Ageratina adenophora growth and competition with native plants.

LI Li-qing1,2, ZHANG Ming-sheng1, LIANG Zuo-pan2, XIAO Bo2, WAN Fang-hao2, LIU Wan-xue2*   

  1. (1School of Life Sciences, Guizhou University, Guiyang 550025, China; 2State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China)
  • Online:2016-01-10 Published:2016-01-10

摘要: 外来植物与入侵地土壤丛枝菌根真菌(AMF)的互作和反馈已被认为是许多入侵植物的重要入侵机制之一。为进一步探究入侵植物紫茎泽兰(Ageratina adenophora)竞争替代本地植物过程中AMF的作用,本研究首先测定了林下和林地边缘两类生境中紫茎泽兰和本地植物的AMF侵染率和AMF含量,结果表明,2种生境中紫茎泽兰的菌根侵染率和AMF含量均显著高于本地植物,且菌根侵染率与AMF含量呈显著正相关。温室盆栽试验结果进一步表明,接种AMF显著促进了紫茎泽兰的生长,且对硝态氮和有效磷的吸收能力优于本地植物香茶菜(Rabdosia amethystoides),同时降低了竞争中本地植物香茶菜的菌根依赖性,提高了紫茎泽兰对香茶菜的竞争优势度。本研究进一步证实AMF有利于促进紫茎泽兰的竞争性扩张。

关键词: 麦后直播棉, 施氮量, 钾吸收利用, 产量

Abstract: The interaction and feedback of exotic plants and arbuscular mycorrhizal fungi (AMF) have been considered as one of the important invasive mechanisms of many invasive plants. In order to explore the role of AMF in the competition of  invasive plant, Ageratina adenophora over native plants, this study investigated the root AMF colonization rate and AMF content in A. adenophora and native plants beneath forest and its edge area. The results showed that A. adenophora had significantly higher root AMF colonization rate and AMF content than the native plants, and the root AMF colonization rate showed a significant positive correlation with the AMF content. In a greenhouse experiment through adding AMF of A. adenophora to soil, AMF significantly promoted the growth of A. adenophora, whose abilities of absorption of nitrate nitrogen and available phosphorus were stronger than those of the native plant Rabdosia amethystoides. AMF also decreased the mycorrhizal dependency of R. amethystoides, and enhanced the competitive advantage of A. adenophora over the native plant. Our results further indicate that AMF is conducive to the promotion of competitive expansion of A. adenophora.

Key words: nitrogen application rate, potassium uptake and utilization, yield, direct-seeded cotton after wheat harvest