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郑淑霞,上官周平.8种阔叶树种叶片气体交换特征和叶绿素荧光特性比较.生态学报,2006,26(4):1080~1087 本文二维码信息
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8种阔叶树种叶片气体交换特征和叶绿素荧光特性比较
Comparison of leaf gas exchange and chlorophyll fluorescence parameters in eight broad-leaved tree species
投稿时间:2005-01-19  修订日期:2005-10-08
DOI:
关键词气体交换参数  叶绿素荧光  水分利用效率  木兰科  蔷薇科  阔叶树种
Key Wordsgas exchange parameters  chlorophyll fluorescence  water use efficiency  Magnoliaceae  Rosaceae  broadleaved tree species.
基金项目
作者单位
郑淑霞 中国科学院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室陕西 杨凌 712100; 西北农林科技大学陕西 杨凌 712100 
上官周平 中国科学院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室陕西 杨凌 712100; 西北农林科技大学陕西 杨凌 712100 
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摘要:
在自然条件下,测定了8种阔叶树种叶片的气体交换参数和叶绿素荧光参数并对其进行比较。结果表明,8种阔叶树种紫玉兰、广玉兰、玉兰、美人梅、铁杆梅、腊梅、红碧桃和紫薇的叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(gs)、瞬时水分利用效率(WUE)和潜在水分利用效率(WUEi)的种间差异达极显著水平(p<0.01),指示了不同树种间的光合能力及水分利用能力差别较大。8种阔叶树种叶片的初始荧光(Fo)、可变荧光(Fv)、最大荧光(Fm)和PSⅡ电子传递量子效率(ФPSⅡ)的种间差异极为显著(p<0.01),PSⅡ最大光能转换效率(Fv/Fm)、可变荧光与初始荧光之比(Fv/Fo)和非光化学猝灭系数(NPQ)的种间差异也达显著水平(p<0.05),说明各树种叶片的PSⅡ原初光能转换效率和潜在活性、PSⅡ电子传递量子效率以及PSⅡ的潜在热耗散能力差别较大,而实际光下最大荧光(F′m)和PSⅡ光能捕获效率(F′v/F′m)的种间差异不显著。3种木兰科植物的Pn、Tr、WUEWUEi平均值均高于3种蔷薇科植物,说明木兰科植物的光合能力较强,对吸收的光能和水分的利用较高。蔷薇科植物的Fv/Fm、Fv/Fo、ФPSⅡ、F′v/F′m和光化学猝灭系数(qp)平均值均高于木兰科植物,而木兰科植物NPQ较高,表明其PSⅡ的潜在热耗散能力较强,可有效地避免过剩光能对光合机构的损伤。研究还表明3种木兰科植物和3种蔷薇科植物之间的叶绿素荧光参数差异不大,说明同一科属植物叶片的光合能力较为相近。相关分析表明,8种阔叶树种叶片的PnTr、Trgs、Fv/FmFv/Fo、ФPSⅡF′v/F′m、qpNPQ均呈极显著正相关(p<0.01),Pngs呈显著正相关(p<0.05),而Tr、gsWUE、WUEi,PnФPSⅡ,ФPSⅡNPQ,F′v/F′m  qp、NPQ均呈极显著负相关(p<0.01)。
Abstract:
The gas exchange and chlorophyll fluorescence parameters in leaves of eight broadleaved tree species including Magnolia liliflora Desr., M. grandiflora Linn., M. denudata Desr., Prunus mume (Sieb.) Sieb. et Zucc. cv. Meiren Men, P. mume (Sieb.) Sieb. et Zucc. f. alphandii (Carr.) Rehd, P. persica (L.) Batsch. Var. rubro-ple-na., Chimonanthus praecox (Linn.) Link and Lagerstroemia indica L. were determined under field conditions. The results showed that there were significant differences (p<0.01) in the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (gs), water use efficiency (WUE), intrinsic water use efficiency (WUEi) among eight tree species. For the chlorophyll fluorescence parameters, the differences in the initial fluorescence (Fo), variable fluorescence (Fv), maximal fluorescence (Fm), quantum yield of PSⅡ electron transport (ΦPSⅡ) were significant at p<0.01 and the differences in potential efficiency of primary conversion of light energy of PSⅡ(Fv/Fm), the ratio of variable fluorescence to initial fluorescence (Fv/Fo), non-photochemical quenching coefficient (NPQ) were significant at p<0.05. These results indicated that the efficiency of primary conversion of light energy of PSⅡand its potential activities, the quantum yield of PSⅡ electron transport, and the potential capacity of heat dissipation differed significantly among tree species. However, there were no significant differences in maximal fluorescence in light adaptation (F′m) and actual efficiency of primary conversion of light energy of PSⅡ(F′v/F′m) among eight species. Comparatively, the mean values of Pn, Tr, WUE and WUEi were higher in three Magnoliaceae species than in three Rosaceae species, indicating that Magnoliaceae species had higher photosynthetic capacity and stronger utilization ability for water and light energy. However, the mean values of Fv/Fm, Fv/Fo, ФPSⅡ, F′v/F′m and photochemical quenching coefficient (qp) were higher in Rosaceae species than those in Magnoliaceae species, indicating that PSⅡ of the formers had higher capacity of heat dissipation and could prevent photosynthetic apparatus from damage by excessive light energy. The results also suggested that the chlorophyll fluorescence parameters differed little among species in either Magnoliaceae or Rosaceae family, indicating that species in the same family had similar leaf photosynthetic capacity. Correlation analysis among photosynthetic parameters showed that there were significantly positive correlations between Pn and Tr, Tr and gs, Fv/Fm and Fv/Fo, ФPSⅡ and F′v/F′m, qp and NPQ (p<0.01), and between Pn and gs (p<0.05). However, there were significantly negative correlations (p<0.01) between Tr, gs and WUE or WUEi, Pn and ФPSⅡ, ФPSⅡ and NPQ, qp, NPQ and F′v/F′m.
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