南京林业大学学报（自然科学版）2017，Vol.41Issue(5)：191-196,6.DOI:10.3969/j.issn.1000-2006.201606025
完全淹水解除后'中山杉407'生长及光合特性的恢复
The growth and photosynthesis characters of Taxodium hybrid 'Zhongshanshan 407following the de?submergence
摘要
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 submer?gence 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 sub?merged. Photosynthesis and chlorophyll fluorescence parameters of T. '407' were measured using a LI-6400XT gas ex?change 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' adjus?ted 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.关键词
中山杉/全淹/恢复/生长指标/光合作用Key words
Taxodium hybrid/submergence/recovery/growth/photosynthesis分类
农业科技引用本文复制引用
华建峰,韩路弯,王芝权,施钦,殷云龙..完全淹水解除后'中山杉407'生长及光合特性的恢复[J].南京林业大学学报（自然科学版）,2017,41(5):191-196,6.基金项目
国家自然科学基金面上项目(31570593) （31570593）
江苏省自然科学青年基金项目(BK20150551) （BK20150551）
江苏省创新能力建设计划项目(科技设施类) ( BM2015019) （科技设施类）
