豆科植物根际激发效应产生机制的研究

项目名称： 豆科植物根际激发效应产生机制的研究

项目编号： No.41301265

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 韩丽丽

作者单位： 中国科学院生态环境研究中心

项目金额： 26万元

中文摘要： 激发效应在土壤中普遍存在，但它的产生机制目前尚不清楚。研究表明植物品种、土壤性质、微生物种类均会影响激发效应的大小，因此植物根际激发效应的产生是植物、土壤以及微生物三方共同作用的结果。作为激发效应产生的主要驱动者，微生物是如何参与激发效应的产生目前还不是很清楚。过去的研究发现含氮比例高、复合有机物刺激的土壤易产生较高的激发效应。因此，本项目拟针对豆科植物根际激发效应的产生过程，研究土壤微生物的群落结构及其演变特征、关键微生物功能基因及其与相关通量（如CO2的释放）之间的关系；明确对激发效应产生起主要贡献的微生物及其功能基因，揭示豆科植物根际激发效应产生过程中微生物的作用机制，为土壤碳、氮元素循环过程的调控提供依据。

中文关键词： 激发效应；土壤微生物群落；生物和非生物因子；根瘤菌接种；大豆

英文摘要： The priming effect (PE) is ubiquitous in the soil environment, but its generation mechanism is still unclear. Numerous studies have shown that PE would be affected by plant species, soil properties and microbial species, therefore, PE in the plant rhizosphere might be attributed to the interactions of plant, soil and microorganisms. Despite being the dominant drivers of PE, the mechanistic understanding of microbial regulation in PE remained less documented. Previous studies have found that PE tended to be higher in the soils with high levels of nitrogen and composite organic materials. This project will decipher the process of PE in legume rizhosphere, and elucidate the changes of microbial community structure, and the correlations between key functional genes and gaseous fluxes (e.g. the emission of CO2) during this process. Complete understanding of the predominant microbes and functional genes responsible for the PE is essential to interpret the corresponding microbial mechanisms, thereby providing evidence for the mediation of terrestrial carbon and nitrogen cycling.

英文关键词： priming effect；soil microbial community；biotic and abiotic factors；rhizobium inoculation；soybean