中文摘要：

植物根系分泌物的形成是植物体代谢过程中重要的生理现象，为“植物一土壤”体系物质周转的重要环节．研究植物根系分泌物对于了解陆地生态系统质能过程、碳氮收支平衡及提高生态系统的初级生产具有重要意义．本文从植物根系分泌物对植物生理性状、土壤微生物、土壤物质周转及有机污染物降解影响等4个方面对植物根系分泌物的生态效应进行综述，并从重金属含量、营养元素水平、土壤水分和光热条件、物种基因型、土壤微生物状况和外源有机污染物添加的角度综述了影响植物根系分泌物的因素，旨在对植物根系分泌物的生态效应和影响因素进行总结，并根据目前的研究现状，从研究对象、研究方法和效应评估方面进行了展望．

英文摘要：

The formation of plant root exudates is a vital physiological phenomenon in the metabolic processes of plant, and an important link of material turnover in ＂plant-soil＂ system. To study the plant root exudates is of significance in understanding the matter and energy flow, carbon and nitrogen balance, and improvement of primary production in terrestrial ecosystems. This paper reviewed the ecological effect of plant root exudates, such as the effect on plant physiological processes, soil microorganisms, soil matter turnover, and degradation of soil organic contaminants, and summarized the related affecting factors, including soil heavy metals and nutrient contents, soil moisture, light, and heat conditions, plant gene type, soil microorganisms, and input of exogenous organic contaminants. Based on the present research status of plant root exudates, the future research directions about the objects, methods, and effect assessment were prospected.