生态学报2024，Vol.44Issue(5)：1985-1995,11.DOI:10.20103/j.stxb.202304060690
沉水植物性状对不同氨氮脉冲的响应差异
Plant trait changes of submerged macrophytes in response to ammonium pulses
摘要
Abstract
Under the background of global climate change,the intensity and frequency of precipitation will change in the future,and extreme precipitation events can significantly increase the ammonium content in water column in a short period of time,which will affect the growth of submerged macrophytes.However,the physiological and morphological response of submerged macrophytes to different ammonium pulse pattern(i.e.,concentration and frequency)is still unclear.Two common submerged macrophytes(i.e.,Vallisneria natans and Hydrilla verticillata)were selected,and different substrates(i.e.,clay and sand),ammonium pulse patterns(i.e.,CK:control,no ammonium addition;P1:low concentration×high frequency;P2:high concentration×low frequency)and experimental phases(ammonium pulse phase and release pulse phase)were set up to assess the effects of different pulse patterns on plant traits and potential effects after pulse release by measuring plant morphological and physiological traits.The results showed that:(1)Ammonium pulse changed the morphological and physiological traits of submerged macrophytes,with ammonium pulse pattern of high concentration and low frequency having the greatest inhibitory effect on plant growth compare to the pattern of low concentration and high frequency.(2)One month after the release of ammonium pulse,plant biomass of the two species had no difference compared to the control,while the physiological traits(e.g.,free amino acid and soluble carbohydrate)showed significant differences compared with the control.These results indicated that the morphological traits were mostly recovered from ammonium pulse,while the effects on the physiological traits of the submerged macrophytes were still intense and time-lasting.(3)In the phase of releasing pulse,the free amino acid content of V.natans was still significantly higher than that of the control,while the free amino acid content of H.verticillata was less different from that of the control,indicating that the assimilation and turnover efficiency of ammonium was higher in H.verticillata than V.natans.(4)The substrate type affected the response of physiological traits to ammonium pulse,that is,the change of free amino acid and soluble carbohydrate contents in sand was larger than that in clay.Therefore,the ammonium pulse effects were closely related to the pulse concentration and frequency,substrate type,plant species and their morphological and physiological traits.Our findings highlight the importance of plant physiological traits in assessment of plant environmental adaptability,and provide scientific reference for the management of submerged macrophytes in lake ecosystems under global climate change.关键词
氨氮脉冲/沉水植物/生长形态/生理性状Key words
ammonium pulse/submerged macrophyte/growth morphology/physiological trait引用本文复制引用
郭佩琴,肖佳佳,郭婉欣,冷喜文,孙丽君,符辉,袁桂香..沉水植物性状对不同氨氮脉冲的响应差异[J].生态学报,2024,44(5):1985-1995,11.基金项目
国家自然科学基金项目(31760148) （31760148）
湖南省教育厅重点项目(22A0162) （22A0162）
