南京林业大学学报(自然科学版) ›› 2017, Vol. 41 ›› Issue (05): 191-196.doi: 10.3969/j.issn.1000-2006.201606025

• 研究简报 • 上一篇    下一篇

完全淹水解除后‘中山杉407’生长及光合特性的恢复

华建峰1,韩路弯1,王芝权1,2,施 钦1,殷云龙1*   

  1. 1.江苏省·中国科学院植物研究所,江苏 南京 210014; 2.南京林业大学林学院,江苏 南京 210037
  • 出版日期:2017-10-18 发布日期:2017-10-18
  • 基金资助:
    基金项目:国家自然科学基金面上项目(31570593); 江苏省自然科学青年基金项目(BK20150551); 江苏省创新能力建设计划项目(科技设施类)(BM2015019) 第一作者:华建峰(jfhua2009@gmail.com),副研究员。*通信作者:殷云龙(yinyl066@sina.com),研究员。

The growth and photosynthesis characters of Taxodium hybrid ‘Zhongshanshan 407' following the de-submergence

HUA Jianfeng1, HAN Luwan1, WANG Zhiquan1,2, SHI Qin1, YIN Yunlong1*   

  1. 1.Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China; 2.College of Forestry, Nanjing Forestry University, Nanjing 210037, China
  • Online:2017-10-18 Published:2017-10-18

摘要: 【目的】明确‘中山杉407'(Taxodium ‘Zhongshanshan407')在完全淹水胁迫解除后的生长和光合特性,为三峡库区消落带等湿地生态系统恢复与构建中的植被选择提供依据。【方法】以‘中山杉407'2年生苗为试验材料,设置全淹(S)和对照(CK)2个处理,其中S处理的植株预先经过3个月的完全淹水胁迫。淹水胁迫解除后,使用LI-6400 XT气体交换系统和OS1p便携式调制荧光仪测定两处理植株的光合作用参数和叶绿素荧光参数,并于植株恢复生长10个月后,测定其生长指标。【结果】淹水阶段结束后,S组植株的净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)显著高于对照(CK)组植株,而S组的水分利用效率(EWUE)低于CK组。同时,‘中山杉407'维持一定的叶绿素荧光水平,S组和CK组的可变荧光(Fv)、PSⅡ潜在活性(Fv/F0)、PSⅡ最大光量子产额(Fv/Fm)、实际量子产量(ФPSⅡ)和电子传递速率(VETR)均没有显著差异。经过10个月的恢复,S组‘中山杉407'的总干质量、地上部分生物量与CK组无显著差异。【结论】完全淹水胁迫解除后,‘中山杉407'能够通过合理调整生长和光合策略,表现出良好的适应性,是适宜于三峡库区消落带等淹水环境生态修复工程实践的优良树种。

Abstract: 【Objective】Determining the growth and photosynthesis of the Taxodium hybrid ‘Zhongshanshan 407'(T. mucronatum Tenore ♀ × T. distichum(Linn.)Rich ♂, referred to as T. ‘407')recovering from three-month submergence stress could provide the basis for vegetation acclimation screening in the wetland ecosystem. 【Methods】Two-year-old T. ‘407' were subjected to three months' submersion treatment(S)in this study; controls(CK)were not submerged. Photosynthesis and chlorophyll fluorescence parameters of T. ‘407' were measured using a LI-6400XT gas exchange system and OS1p portable modulation fluorometer. Then, plant growth indexes were measured after 10 months during recovery. 【Results】The net photosynthetic rate(Pn), stomatal conductance(Gs)and transpiration rate(Tr)of T. ‘407' in the S treatment were significantly higher than those in CK after submersion, whereas water use efficiency(EWUE)showed the opposite trend. In addition, chlorophyll fluorescence of T. ‘407' in the S treatment maintained a certain level during the recovery process. The parameters of variable fluorescence(Fv), potential activity of PSII(Fv/F0), light conversion efficiency(Fv/Fm), actual photochemical efficiency(ΦPSⅡ), and electron transport rate(VETR)of T. ‘407' exhibited no significant differences between S and CK treatments. Moreover, no significant differences were found in total and shoot biomass between S and CK treatments after 10 months of recovery.【Conclusion】T. ‘407' adjusted its growth and photosynthesis strategies to adapt to de-submergence; it is thus very promising species for ecological restoration in wetland ecosystems such as the Three Gorges Reservoir area. Furthermore, this study provided a scientific basis for ecosystem restoration and plant screening in wetlands.

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