| 1 | Response of leaf photosynthetic characteristics of Syringa oblata and Syringa reticulata var.mandshurica to chilling stress显示文摘Syringa species not only have good ornamental properties but also play an important role in the landscaping and environmental purification of cities.To investigate the chilling stress resistance of Syringa oblata Lindl.and Syringa reticulata var.mandshurica and provide theoretical grounds for the practical cultivation of Syringa species,in vitro leaves were used to study photosynthetic gas exchange parameters and chlorophyll fluorescence parameters.After nine hours of chilling,decreasing rates of net photosynthesis,stomatal conductance,and transpiration in S.reticulata var.mandshurica leaves were significantly greater than that of the S.oblata,while intercellular CO2 concentrations in S.oblata leaves were higher than those in S.reticulata var.mandshurica.The quantum yield of PSII reaction center(APSII)declined in S.reticulata and light capture efficiency(Fv 0/Fm 0)was stable.However,reduction percentages of Fv 0/Fm 0,APSII,and Fv/Fm in S.oblata were significant higher than those of S.reticulata var.mandshurica.After nine hours of chilling,the relative variable fluorescence of VJ and VI of S.oblata increased and the increasing rate of VJ was greater than VI.In contrast,the change of VJ and VI in S.reticulata var.mandshurica leaves was relatively small.This suggests that chilling primarily damaged the electron transport process of QA to QB at the receptor site of the PSII reaction center.Photosynthetic capacity of S.oblata was more sensitive to chilling stress compared to S.reticulate var.mandshurica,which the limitations were mainly due to non-stomatal factors such as the decrease in electron transport efficiency,activity in the PSII reaction center,and the destruction of the photodamage defense system. | Xiaojia Liu Baiyi An Na Gu Cainan Guo Xiaogang Sun He Wang | 2020 | Journal of Forestry Research2020，31，2： | 8 |
| 2 | Can forest bathing in spring enhance the positive psychological response of university students: A pilot study in Northeast China显示文摘Forest bathing is well known to be beneficial of the visitors’psychological changes with better emotion and mood.Most understanding about the psychological change of university students in response to forest bathing is mainly obtained by the profile of mood states(POMS)method:a psychological rating scale to assess the transient and distinct mood states.Although some other studies explored to use a new questionnaire to assess the psychological change of university students in the urban park,more detailed information is scarce.In this study,23 university students(12 female;aged 20-23)were recruited to walk for 3.5 hours in Nanhu forest park,Changchun,China on 22 and 23 May 2018,when they were arranged to walk in an urban routine simultaneously.It was found that these students instantiated more positive emotion in the urban forest.These positive psychological changes were accompanied by improved perception about personal details and school work.In contrast,participants walking in the urban environment did not feel any psychological change.Therefore,forest bathing can be taken as an active way to stimulate more positive psychological changes compared to the urban experience.However,as a pioneer project,this study suggests more studies by designing more specific questions about social contact affairs for university students’forest bathing. | Wei Hongxu Wang Dan He Xingyuan Ren Zhibin An Baiyi | 2018 | 林业与环境科学2018，34，4： | 0 |
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