Key Laboratory of Forest Plant Ecology, Ministry of Education, College of Chemistry, Chemical Engineering and Resource Utilization, Engineering Research Center of Forest Bio-preparation, Ministry of Education, Heilongjiang Provincial Key Laboratory of Ecological Utilization of Forestry-based Active Substances, Northeast Forestry University, Harbin 150040, China.
Key Laboratory of Forest Plant Ecology, Ministry of Education, College of Chemistry, Chemical Engineering and Resource Utilization, Engineering Research Center of Forest Bio-preparation, Ministry of Education, Heilongjiang Provincial Key Laboratory of Ecological Utilization of Forestry-based Active Substances, Northeast Forestry University, Harbin 150040, China.
Sci Total Environ. 2024 Aug 25;940:173663. doi: 10.1016/j.scitotenv.2024.173663. Epub 2024 May 30.
In a mixed forest, certain plants can release allelochemicals that exert allelopathic effects on neighboring plants, thereby facilitating interspecific coexistence of two species. Previous studies have demonstrated that allelochemicals released from Ficus carica Linn. roots in mixed forest of F. carica and Taxus cuspidata Sieb. et Zucc. has phase characteristics over time, which can improve the soil physicochemical properties, enzyme activity and microbial diversity, thus promoting the growth of T. cuspidata. Based on the irrigation of exogenous allelochemicals, changes in soil fertility (soil physical and chemical properties, soil enzyme activity and soil microelement content) were observed in response to variations in allelochemicals during five phases of irrigation: initial disturbance phase (0-2 d), physiological compensation phase (2-8 d), screening phase (8-16 d), restore phase (16-32 d) and maturity phase (32-64 d), which was consistent with the response of soil microorganisms. The allelopathic response of growth physiological indexes of T. cuspidata, however, exhibited a slight lag behind the soil fertility, with distinct phase characteristics becoming evident on the 4th day following irrigation of allelochemicals. The findings demonstrated that the allelochemicals released by the root of F. carica induced a synergistic effect on soil fertility and microorganisms, thereby facilitating the growth of T. cuspidata. This study provides a comprehensive elucidation of the phased dynamic response-based allelopathic mechanism employed by F. carica to enhance the growth of T. cuspidata, thus establishing a theoretical basis for optimizing forest cultivation through allelopathic pathways.
在混交林中，某些植物会释放化感物质，对邻近植物产生化感作用，从而促进两种植物的种间共存。先前的研究表明，在榕属和红豆杉混交林中，榕属根系释放的化感物质在时间上具有阶段性特征，能够改善土壤理化性质、酶活性和微生物多样性，从而促进红豆杉的生长。基于外源化感物质的灌溉，观察到在灌溉的五个阶段（初始干扰阶段（0-2d）、生理补偿阶段（2-8d）、筛选阶段（8-16d）、恢复阶段（16-32d）和成熟阶段（32-64d））中，土壤肥力（土壤理化性质、土壤酶活性和土壤微量元素含量）会发生变化，这与土壤微生物的变化一致。然而，红豆杉生长生理指标的化感反应却略微滞后于土壤肥力，在灌溉化感物质后的第 4 天，就表现出明显的阶段性特征。研究结果表明，榕属根系释放的化感物质对土壤肥力和微生物产生协同作用，从而促进了红豆杉的生长。本研究全面阐述了榕属通过化感作用促进红豆杉生长的阶段性动态响应机制，为通过化感途径优化森林培育提供了理论依据。
