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| 土壤水肥胁迫对尾叶桉叶绿素荧光参数的影响 |
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杨会肖,张卫华,杨晓慧,廖焕琴,徐放,潘文
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广东省森林培育与保护利用重点实验室,广东省森林培育与保护利用重点实验室,广东省林业科学研究院;广东省森林培育与保护利用重点实验室,广东省林业科学研究院;广东省森林培育与保护利用重点实验室,广东省森林培育与保护利用重点实验室,广东省森林培育与保护利用重点实验室
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| 摘要: |
| 以尾叶桉（Eucalyptus urophylla）无性系幼苗为供试材料，通过 2 因素 3 水平控制土壤水分和
养分，测定了不同水肥处理下 18 个月生尾叶桉的叶绿素荧光特性，结果表明：水肥胁迫对叶绿素荧光参
数影响显著；土壤含水量越低或养分含量越高，尾叶桉幼苗的初始荧光（Fo）、最大荧光（Fm）、PSⅡ的
非环式电子传递的量子效率 (ΦPSⅡ )、PSⅡ最大光化学效率 (Fv /Fm )、光化学猝灭系数 (qP) 和电子传递量子
产量（ETR）参数值就越高；尾叶桉幼苗的非光化学猝灭系数值随土壤含水量增加呈现升高趋势，说明尾
叶桉幼苗能通过热耗散消耗过剩光能，避免光合机构受到破坏；尾叶桉在不同水肥处理下实际光化学效
率（ΦPSⅡ）值较低，非化学猝灭系数（NPQ）较高，说明尾叶桉吸收的光能主要用于热耗散，表观电子
传递速率较高表明尾叶桉属于较高光呼吸的植物。 |
| 关键词: 尾叶桉 水分胁迫 养分胁迫 叶绿素荧光 |
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| 基金项目:广东省科技计划项目(2016B070701008),广东省林业科技创新项目(2016KJCX002)资助This work was supported by the Planning projects for Science and Technology in Guangdong (Grant No. 2016B070701008), the Innovation Project for Forestry Science and Technology in Guangdong (2016KJCX002). |
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| Effects of Different Water and Nutrient Stress on Chlorophyll Fluorescence Parameters of Eucalyptus urophylla Seedling |
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Yang Huixiao,Liao Huanqin,yang xiaohui,Xu Fang,Yang Xiaohui and Pan Wen
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Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Academy of Forestry;Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Academy of Forestry;Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization
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| Abstract: |
| The chlorophyll fluorescent characteristics of Eucalyptus urophylla seedlings under different water and nutrient treatment by 2 factors and 3 levels experiment in this paper were analyzed. The result shows that fluorescence parameters of the E. urophylla seedling were significantly affected by the water and nutrient stresses. The more soil water content was lower or nutreint content was higher, the more initial fluorescence（Fo）, maximal fluorescence (Fm), quantum efficiency of noncyclic electron transfer of PS II ((ΦPSII), PS II photochemical efficiency(Fv/Fm), photochemical quenching coefficient (qP) and electron transport quantum yield (ETR) parameter value were higher. The non-photochemical quenching coefficient of E. urophylla seedlings showed significantly increasing trend with the soil water content was higher, which suggested that of E. urophylla seedlings can be consumed by thermal dissipation of excess light energy to avoid damage for the photosynthetic mechanism. The actual photochemical efficiency (ΦPSII) of E. urophylla was lower, and the Non-photochemical quenching coefficient (NPQ) was higher, which suggested that the light energy absorbed by E. urophylla was mainly used for heat Dissipation. The apparent electron transport rate (ETR) is higher, indicating that E. urophylla belongs to higher light breathing plants. |
| Key words: Eucalyptus urophylla Water Nutrient Stress Chlorophyll fluorescence parameters |
