臧传富,苏建荣,张志钧.云南红豆杉扦插苗和实生苗的生长及光合特性[J].林业科学研究,2010,23(3):411-416
云南红豆杉扦插苗和实生苗的生长及光合特性
Research of Photosynthetic Characteristics and the Growth ofSeedlings and Cutting Stocks of Taxus yunnanensis
  
DOI:
中文关键词:  云南红豆杉  实生苗  扦插苗  净光合速率  水分利用效率
英文关键词:Taxus yunnanensis  seed seedlings  cutting seedlings  net photosynthetic rate  water use efficiency
基金项目:国家科技支撑计划(2006BAD18B03,2008BADB0B0401)、国家林业局重点项目(2008-06)、云南省自然科学基金(2008CD200)、云南省科技攻关计划(2006NG28)
作者单位
臧传富 中国林业科学研究院资源昆虫研究所,云南 昆明 650224 
苏建荣 中国林业科学研究院资源昆虫研究所,云南 昆明 650224 
张志钧 中国林业科学研究院资源昆虫研究所,云南 昆明 650224 
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中文摘要:
      为摸清云南红豆杉实生苗和扦插苗在生长和光合特性方面的特性和差异,在田间条件下,以2年苗龄的云南红豆杉实生苗和扦插苗为研究对象,用Licor-6400便携式光合作用测定系统测定了实生苗和扦插苗的光响应曲线和光合生理日变化,同时对实生苗和扦插苗生长、树形和生物量进行测定分析。结果表明:云南红豆杉实生苗的生长量、生物量和光合生理指标都基本优于扦插苗。实生苗的冠幅和生物量较扦插苗优势明显,实生苗净光合速率(Pn)总体高于扦插苗。实生苗净光合速率日变化呈双峰曲线,存在明显的"光午休"现象,扦插苗光合日变化呈单峰曲线。同时,实生苗对光环境和水分环境的适应能力优于扦插苗。实生苗在光补偿点和近光饱和点之间存在的光能利用区间大于扦插苗,实生苗的Pn和WUE的日积分值都大于扦插苗。
英文摘要:
      To understand the property and difference of the photosynthetic characteristics of seedlings and cutting stocks of Taxus yunnanensis, the response of net photosynthesis rate to light intensity and the diurnal variations of photosynthesis in the seedlings and the cutting stocks were measured with Licor-6400 in the two-year-old Taxus yunnanensis planted in fields.Moreover, the growth, the tree-form and the biomass of the seedlings and the cutting stocks were analyzed. The results showed that the growth, the biomass and the net photosynthetic rate of the seedlings excelled that of the cutting stocks. And the crown-width, the biomass and the net photosynthetic rate of seedlings was significantly higher than that of the cutting stocks. The diurnal variations of net photosynthetic rate in seedlings showed bimodal peaks curve, and had 'midday depression of photosynthesis’. The diurnal variation of net photosynthetic rate of cutting stocks showed a single peak curve. Meanwhile, the capacity of accommodation about light and water circumstances of seedlings was higher than that of the cutting stocks. And the interval of light compensation point and light saturation point in seedlings was higher than that of the cutting stocks. The daily accumulation value of net photosynthetic rate and water use efficiency of seedlings were also higher than that of the cutting stocks.
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