• 研究报告 •

### 异质性光照生境下克隆整合对外来入侵植物薇甘菊生长的影响

1. (中国热带农业科学院环境与植物保护研究所/农业部热带作物有害生物综合治理重点实验室/农业部儋州农业环境科学观测实验站/海南省热带农业有害生物监测与控制重点实验室， 海口 571101)
• 出版日期:2018-04-10 发布日期:2018-04-10

### Effects of clonal integration on the growth of the invasive speciesMikania micrantha in habitats with heterogeneous light availability.

LI Xiao-xia, SHEN Yi-de, FAN Zhi-wei, WANG Ya, LIU Yan, HUANG Qiao-qiao*

1. (Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences/Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture, China/Danzhou Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture, China/Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou 571101, China).
• Online:2018-04-10 Published:2018-04-10

Abstract: Mikania micrantha is native to Central and South America. In 1919, M. micrantha appeared as a weed in Hong Kong, China. Since then, it has spread rapidly. At present, it can be found in many provinces of China, posing serious threats to forests, farmlands and orchards. It is one of the top 100 worst weeds in the world. A greenhouse experiment was conducted to examine the effects of clonal integration on the performance of the stoloniferous herbM. micrantha in habitats with heterogeneous light availability. The results showed that when light availability was heterogeneous, clonal integration increased biomass of ramets grown in patches with low light availability, reduced biomass of those grown in patches with high light availability, and did not significantly change the biomass accumulation of the whole clonal fragments. Clonal integration reduced the differences in root/shoot ratio among ramets, increased the difference in photosynthetic rate among ramets, and tended to increase the specific leaf area in the ramets grown under high light conditions. These results suggest that clonal integration did not affect the biomass accumulation of the whole clonal fragments of M. micrantha stolons grown under heterogeneous light conditions, but it would enhance the growth of the ramets grown under low light availability. Consequently, clonal integration would enhance the invasion of M. micrantha from open habitats to habitats with low light availability (e.g., forests, weed communities). Our results indicated that clonal integration is one of the important strategies for M. micrantha to adapt to habitats withheterogeneous light availability.