干旱和复水对喀斯特石生反叶扭口藓(Barbula fallax Hedw.)叶绿素荧光特性的影响———以贵阳市花溪区附近严重石漠化区域为例
The drought stress and rehydration influence on chlorophyll fluorescence characteristics of Barbula fallax Hedw.in areas of karst rocky desertification: Case study near Huaxi district,Guiyang City
查看参考文献18篇
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文摘
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为在喀斯特石漠化生态恢复治理中科学选择抗旱植物材料提供依据,本文以贵阳花溪区附近石漠化区为例,利用快速叶绿素荧光动力学技术研究了干旱和复水对石生反叶扭口藓(BarbulafallaxHedw.)叶绿素含量和荧光特性变化的影响,探讨了石漠化干旱环境与石生藓类光合特征的关系。结果表明:反叶扭口藓随干旱胁迫的增加,叶绿素含量总体呈出先降低后升高的趋势;叶绿素荧光参数Fo、qN上升,F_m、F_v/F_m、Yield、ETR、qP都随干旱胁迫的加剧而下降;在胁迫时间较短复水后(24h)叶绿素荧光参数(Fo、F_m、F_v/F_m、Yield、qP、qN)基本恢复到对照水平,超过24h造成胁迫程度的加重则无法恢复到对照水平。 |
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其他语种文摘
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Guiyang city is located in the central Guizhou Province,at an average elevation of 1 100m,annual average temperature 15.2℃and annual average rainfall of 1 178mm.The soil in Guiyang is predominately calcareous(accounting for 85%),whose parent rocks are mainly dolomitic limestone and calcium dolomite. Its forest coverage is 5%-15%,the vegetation coverage is 10%-90%,the bare rock is 30%-90%, the land reclamation is 10%-70%,and the average rocky desertification is 36.79%.Huaxi district in Guiyang is taken as an example for ecological restoration and treatment research,which provides the basis for scientific selection of drought-resistant plants for cultivation in karst rocky desertification areas.Chlorophyllfluorescence was measured by a handy PAM-2100fluorometer in moss Barbula fallax Hedw.when drought and rehydration affected chlorophyll content and fluorescence under increased drought stress,the total chlorophyll content first dropped,and then increased gradually.F0and qN of three kinds of mosses increased while the F_m,F_v/F_m,Yield,ETRand qPdecreased with drought stress.Fluorescence parameters after rehydration were restored to normal levels by mild to moderate stress,and severe stress is more difficult to return to the control level. |
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来源
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中国岩溶
,2014,33(1):77-81 【扩展库】
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关键词
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反叶扭口藓(Barbula fallax Hedw.)
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干旱胁迫
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复水
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叶绿素荧光
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地址
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贵州警官职业学院, 环境地球化学国家重点实验室;;重庆市三峡库区生态环境与生物资源省部共建国家重点实验室, 贵州, 贵阳, 550005
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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西南大学生命科学学院, 重庆市三峡库区生态环境与生物资源省部共建国家重点实验室, 重庆, 400715
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4810 |
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学科
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植物学 |
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基金
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重庆市三峡库区生态环境与生物资源省部共建国家重点实验室培育基地开放基金项目
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文献收藏号
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CSCD:5138856
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