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克隆整合对异质性土壤养分生境下薇甘菊生长的影响

李晓霞,范志伟,沈奕德,李少梁,刘延,黄乔乔*   

  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:2017-05-10 发布日期:2017-05-10

Effects of clonal integration on the growth of Mikania micrantha in habitats with heterogeneous nutrient availability.

LI Xiao-xia, FAN Zhi-wei, SHEN Yi-de, LI Shao-liang, LIU Yan, HUANG Qiao-qiao*#br#   

  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:2017-05-10 Published:2017-05-10

摘要: 环境资源的异质性在自然界中普遍存在。克隆植物能通过克隆整合较好地适应异质性生境。本文以海南外来强入侵性植物薇甘菊为材料,通过温室盆栽试验,研究克隆整合对异质性土壤养分生境下薇甘菊克隆片段生长的影响。结果表明:在养分异质下,克隆整合显著提高了低养分斑块分株的生物量,但同时降低了高养分斑块分株的生物量,对克隆片段总体的生长无显著影响,且这一结果不受资源输送方向的影响。克隆整合对薇甘菊克隆分株的光合速率和比叶面积影响较小,但当近端分株处于高养分条件时,其改变了克隆分株的根冠比。这些结果指示:克隆整合有利于异质性土壤养分条件下薇甘菊对低养分斑块的占领。因此,克隆整合可影响薇甘菊对资源异质性生境的入侵能力,它使薇甘菊能够扩展到低养分斑块,从而提高其入侵扩散能力。

关键词: 生态安全格局, 生态廊道, 杭锦旗, 地表湿润指数, 生态源地

Abstract: Heterogeneity in resource availability is common in nature. Clonal plants can adapt to habitats with heterogeneous nutrient availability by clonal integration. We conducted a pot experiment to examine the effects of clonal integration on the performance of a strongly invasive plant in Hainan, Mikania micrantha, growing in habitats with heterogeneous nutrient availability. The results demonstrated that when nutrient availability was heterogeneous, clonal integration increased the biomass of the ramets growing in patches with low nutrient availability, reduced the biomass of the ramets growing in patches with high nutrient availability, and did not significantly change the biomass of the whole clonal fragments. This result was not affected by the direction of resource transportation. Clonal integration did not significantly change the ramets’ photosynthetic rate and specific leaf area, but when the proximal ramets grew under high nutrient conditions, clonal integration changed the root/shoot ratio of the clonal ramets. These results indicate that clonal integration benefits the growth of M. micrantha ramets growing in patches with low nutrient availability. Therefore, clonal integration is an important growth strategy for M. micrantha to adapt to environments with heterogeneous resource availability, and it can allow M. micrantha to expand to low nutrient patches, improving the plant’s invasion and expansion capacity.

Key words: ecological security pattern, Hangjin Banner., ecological corridor, ecological source, surface humid index