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高寒草甸麻花艽和美丽风毛菊的光合速率午间降低现象 预览 被引量:17

Midday Depression of Photosynthesis of Gentiana straminea and Saussurea superba in Alpine Kobresia humilis Meadow
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摘要 在中国科学院海北高寒草甸生态系统定位研究站地区,用便携式光合蒸腾测定仪(CI-301PS)和液相极谱氧电极(SP-2)观测到,全晴天2种高山植物麻花艽和美丽风毛菊叶片的净光合速率(Pn)、光合放氧速率和表观量子效率(AQY)有明显的午间降低现象.遮光实验表明,这种现象是由高原地区当地太阳正午时前后较强的太阳辐射造成的. Experiments were conducted in alpine Kobresia humilis meadow near Haibei Alpine Meadow Ecosystem Research Station (37°29′~37°45′ N, 101°12′~101°33′E;alt.3 200 m). The results measured by CI 301PS portable photosynthetic system indicated that there was marked midday depression of net photosynthetic rate (Pn) in alpine plants of Gentiana straminea and Saussurea superba (Fig.1). Measurements using oxygen electrode demonstrated that both photosynthetic O 2 evolution rate and apparent quantum efficiency (AQY) were depressed around noon (Fig.4). All these phenomena of midday depression could not be fully accounted for by the changes in stomatal conductance (Gs), and there was also no relationship with temperature in canopy. The changes in vapor pressure deficit (VPD) between leaves and air was large enough to affect Pn, but there was no reduction of VPD around noon, so it could not bring about the midday depression of Pn observed in G. straminea and S. superba . When an iron wire net was used to reduce the total solar radiation, PAR and UV B by about 30% at local solar noon (about 13:15 Beijing time), no midday depression of photosynthetic O 2 evolution rate or AQY was observed (Fig.5). All these phenomena demonstrated that midday depression of photosynthesis could be attributed to strong solar radiation, which could also raise leaf and air temperature and thereby VDP around noon in the alpine K. humilis meadow regions.
作者 师生波 韩发 李红彦 SHI Sheng Bo HAN Fa LI Hong Yan  ( Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810001)
出处 《植物生理学报(ISSN0257-4829)》 CSCD 2001年第2期 123-128,共6页 Acta Phytophysiologica Sinica
基金 国家自然科学基金 (3 95 70 12 9 3 9770 13 5 ) 国家基础研究规划项目(19980 40 80 0 ) 中国科学院特别支持项目 (KZ95T 0 4,KZ95T 0 6, KZ95 1 A1 2 0 4,KZ95 1 A1 3 0 1)
关键词 矮蒿草草甸 高山植物 净光合速率 高寒草甸 午间降低 麻花艽 美丽风毛菊 Kobresia humilis meadows, alpine plants, net photosynthetic rate, midday depression.
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