增温对植物根系分泌物特征的影响研究进展

Effects of Warming on Plant Fine Root Exudates:A Review

根系分泌物对土壤结构的形成、土壤养分活化、植物养分吸收、环境胁迫缓解等方面均起到重要作用,也在森林生态系统能量流动和物质循环中发挥着十分重要的作用。全球变化可能会引起森林生态系统地下部分碳通量的变化,进而影响地下碳动态及碳循环。因此,全球变暖对地下生态过程的影响已成为全球变化背景下关注的热点问题,而根系分泌物对全球变暖的响应将直接影响到生态系统碳平衡。然而目前有关根系分泌物对增温的响应研究还较为缺乏,研究结果也还存在较多不确定性。为此结合目前该领域国内外的前沿动态,就增温对植物根系分泌物数量和质量的影响进行了综述,同时阐述了增温背景下根系分泌物的变化对陆地碳循环的可能影响,并对未来全球变暖背景下根系分泌物需要深入研究的方向进行了展望。未来的研究还应加强不同增温方式、增温与其他气候变化因子的交互作用对根系分泌物的影响及其生态效应的研究,同时从植物生理代谢等角度深入揭示增温对根系分泌物影响的机理。

Root exudates play an important role in the formation of soil structure,soil nutrient activation,plant nutrient absorption,environmental stress mitigation.They also play a critical role in energy and matter circulation in forest ecosystem.Global change may cause the change of carbon flux in the belowground part of forest ecosystem,and then affect the belowground carbon dynamics and carbon cycle.Thus,the effect of global warming on belowground ecological process is becoming a hot topic under the background of global climate change,and the response of root exudates to global warming will directly affect the ecosystem carbon balance.However,there are few studies focusing on the response of root exudates to warming,while the results are uncertain.This paper reviews the effects of warming on the quantity and quality of plant root exudates,and the possible influence of root exudates on terrestrial carbon cycle under the background of warming was discussed.Last but not the least,the future research direction of root exudates was prospected.The future research should also strengthen the research on the effects of different warming methods and the interaction between warming and other climate change factors on root exudates and their ecological effects,and reveal the mechanism of the effects of warming on root exudates from the perspective of plant physiological metabolism.