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Research of Photosynthetic Characteristics and the Growth of Seedlings and Cutting Stocks of Taxus yunnanensis

  • 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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Research of Photosynthetic Characteristics and the Growth of Seedlings and Cutting Stocks of Taxus yunnanensis

  • 1. Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, Yunnan, China

Abstract: 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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