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濒危植物云南金钱槭对光、水环境的适应性

邓云1;王冰1;苏文华1;张光飞1;欧阳志勤2   

  1. 1云南大学生态学与地植物学研究所, 昆明 650091;2云南省
    珍稀濒危植物引种繁育中心, 昆明 650032
  • 收稿日期:2007-08-12 修回日期:1900-01-01 出版日期:2008-06-10 发布日期:2008-06-10

Adaptability of endangered plant Dipteronia dyerana under irradiance and water stress.

DENG Yun1;WANG Bing1;SU Wen-hua1;ZHANG Guang-fei1;OUYANG Zhi-qin2   

  1. 1Institute of Ecology and Geobotany, Yunnan University, Kunming 650091
    , China;2Yunnan Introduction & Propagation Center of Rare & Endangered P
    lant, Kunming 650032, China
  • Received:2007-08-12 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10

摘要: 以云南金钱槭(Dipteronia dyerana)扦插苗为材料进行温室不同光照、水分供应分组试验,结果表明: 高水和强光环境均导致云南金钱槭总叶绿素含量减少,Chl a/b增加;强光下通过叶面积和比叶质量的增加弥补捕光色素复合体Ⅱ(LHCII)活性的降低,避免强光损害;干旱和弱光环境导致PSⅡ最大光化学量子效率下降,干旱时单叶面积显著减少,弱光下则比叶面积下降。认为干旱是云南金钱槭分布的主要限制因素,不适应弱光进一步导致云南金钱槭濒危。保护时应注意对生境的适度干扰,减缓群落自然演替。

关键词: 玉米, 营养成分, 时空动态

Abstract: A greenhouse experiment was conducted to study the adaptability of Dipteronia dyerana cuttage seedlings under different irradiance and water supply. The results showed that both waterlogging and high irradiance induced the decrease of total chlorophyll content and the increase of Chl a/b. Under high irradiance, the leaf area and specific leaf mass were increased, which offset the declined activity of light-harvesting complex Ⅱ (LHCII) and avoid the high irradiance damage. Soil drought and low irradiation led to the decrease of Fv/Fm. Leaf area decreased significantly under soil drought, and specific leaf area decreased under low irradiation. Soil drought was the main limiting factor in D. dyerana population distribution, and this effect was enhanced under low irradiation. Habitat’s moderate disturbance was suggested to conserve D. dyerana and to slow down its community’s natural succession.

Key words: Maize, Chemical constituents, Temporal and spatial dynamics