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低剂量电离辐射环境下微生物群落物种多样性的产生和维持机制
许心铭, 胡大伟, 付玉明, 张金晖, 刘红
北京航空航天大学 生物与医学工程学院 环境生物学与生命保障技术研究所, 北京 100083
摘要:
空间站微生物严重滋生现象表明:在低剂量电离辐射(Low-Dose Ionizing Radiation,LDIR)环境下,微生物群落物种多样性水平大大增加,其机制目前尚不清楚。在前期调查和具体实验观测的基础上,本研究首次提出LDIR能够使微生物群落中的物种产生不同程度的生长延迟效应,从而减小了物种之间的竞争排斥,诱导并维持了微生物群落的物种多样性。本研究基于经典的Lotka-Volterra竞争模型,将生长延迟时间环节引入其中,得到LDIR下微生物群落的演替模型,在Matlab/Simulink平台上进行大规模的计算机仿真实验,获得LDIR下微生物多样性产生和维持的动力学机制,得到结果可为认识低剂量电离辐射环境下微生物群落的演替过程提供科学的理论依据。
关键词:  低剂量电离辐射;竞争排斥;生长延迟;延迟Lotka-Volterra竞争模型;计算机仿真
DOI:10.15982/j.issn.2095-7777.2019.01.005
分类号:Q948.15
基金项目:载人航天预先研究资助项目(020301)
Formation and Maintenance Mechanism of Species Diversity in the Course of Microbial Succession Under Low Dose Ionizing Radiation
XU Xinming, HU Dawei, FU Yuming, ZHANG Jinhui, LIU Hong
Institute of Environmental Biology and Life Support Technology, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
Abstract:
It remains a mystery why the highly complicated species diversity is formed and sustained in microbial community in low-dose ionizing radiation (LDIR). Based on prophase investigation and experimental observation,in the research,a hypothesis is first proposed in this research that different levels of delay effect on population growth resulting from exposure to LDIR can greatly mitigate competitive exclusion,inducing and sustaining the species diversity in microbial community. The kinetic model of microbial community succession in the environment of LDIR was obtained by introduction of delay effect into classic Lotka-Volterra competition model,and then a great deal of digital simulations were carried out to elucidate the generation and maintenance mechanisms of species diversity induced by LDIR. The results provide a theoretical basis for understanding the dynamic mechanism of microbial community succession in LDIR environments.
Key words:  low-dose ionizing radiation;growth delay effect;competitive exclusion;kinetic model;digital simulation