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Study On Photosynthetic Physiological Ecology Of Main Forest-Forming Species In The Eastern Part Of Northeast Of China

Posted on:2003-08-12Degree:DoctorType:Dissertation
Country:ChinaCandidate:J FanFull Text:PDF
GTID:1100360065460917Subject:Ecology
Abstract/Summary:PDF Full Text Request
In the natural environment, using LCA-4 IRGA to measure photosynthetic rate and transpiration rate of nine main forest-forming species in the same habitat and origin, the characteristics of physiological ecology, such as water use efficiency, combined chlorophyll concentration and leaf nitrogen content, are studied. Furthermore, the effects of physiological factors (stomatal conduction, CO2 concentration in cell clearance, etc.) and ecological factors (photosynthetic available radiation, temperature, atmospheric water vapor deficit, etc.) on photosynthetic rate and transpiration rate are analyzed.Dynamics of leaf photosynthetic rate, transpiration rate and water use efficiency, and seasonal change of leaf nitrogen content, combined chlorophyll concentration and specific leaf weight are mainly represented as the difference of fluctuation intensity, amplitude and appearance time of peak of all variation types. Statistic results show that transpiration rate and CO2 concentration in cell clearance are main influencing factors of leaf photosynthetic rate to nine species in the whole growth season; photosynthetic available radiation is the most important influencing factor of transpiration rate, next is air temperature. Water use efficiency is mainly dependent on leaf photosynthetic rate, as well as CO2 concentration in cell clearance and stomatal conduction.Seasonal change of photosynthetic capacity is related with growth rhythm closely. Leaf nitrogen content of Betula platyphylla, Fraxinas mandshurica, Quercus mongolica, Pinus koraiensis and its photosynthetic capacity have statistical significant correlation, and correlation coefficients are between 0.51 and 0.97. Photosynthetic capacity is high when chlorophyll concentration is high, both of them are relative significantly. Specific leaf weight of Fraxinas mandshurica, Quercus mongolica and two years old leaf of Pinus koraiensis is relative with photosynthetic capacity significantly. The photosynthetic capacity of different species have great difference. Juglans mandshurica is the greatest(23.6 molm-2s-1), and 8.25 times of Pinus sylvestris (2.86 wnolm-2s-1). Ananal average water use efficiency of different species have less difference comparatively. Betula platyphylla is the greatest, and 1.72 times of Pinus koraiensis.Nine species are ordered separately according to photosynthetic rate, transpiration rate, water use efficiency and transpiration coefficient. In addition, Betula platyphylla, Fraxinas mandshurica, Quercus mongolica and Pinus koraiensis are ordered according to leaf nitrogen content, combined chlorophyll concentration, specific leaf weight and photosynthetic nitrogen utilization efficiency. On the basis of transpiration rate, species are classified into four types: high yield and water saving, low yield and water saving, high yield and water consuming and low yield and water consuming.
Keywords/Search Tags:Photosynthetic rate, Transpiration rate, Water use efficiency, Transpiration coefficient, Leaf nitrogen content, Combined chlorophyll concentration, Specific leaf weight
PDF Full Text Request
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