The Preliminary Research On The Photosynthetic Characteristics In Optimizing Cinnamomum Camphora

This paper introduced the success of Zhengzhou Camphor tree Photosynthetic characteristics were studied in preliminary research.In order to find out the natural cooling down.Camphor normal during overwinter period of light and other environmental factors adaptability.And with Primaries Camphor tree quality saplings for research object.The photosynthetic Physiological indexes of tested.and combined with its Morphological index.through the comparative analysis.further grow better choose good winter in the huanghe valley.By Camphor trees in order to provide theoretical basis for camphor tree planting.This research has achieved the following main results:1.Camphor trees five months respectively on the instantaneous optimal Photosynthetic characteristics for variance analysis and multiple comparison.In the same natural conditions.with the natural cooling changes.net photosynthetic rate produce corresponding change.One ZS3、ZS4、ZS7.the net photosynthetic rate obviously higher than other test Camphor tree.Camphor trees transpiration rate with the change in temperature and volatile ZS4、ZS5、ZS6.including the transpiration rate of obviously lower than other test camphor tree.Camphor trees intercellular CO₂ concentration in the temperature drops.present a downward trend.the temperature rise resumed, intercellular CO₂ concentration gradually rise.Camphor trees in temperatures reduce water use efficiency.short term has risen.In the long term low temperature conditions, ZS3、ZS4、ZS7water use efficiency.explains the basic relatively stable ZS3、ZS4、ZS7adaptive ability to low temperature is superior to other experimental camphor tree.Camphor trees stomatal conductance with temperature changes in the tremendously.but natural cooling conditions ZS3、ZS4、ZS7.for less influence of stomatal conductance;Optimization ZS7、ZS4、ZS3.Camphor tree.the stomatal limitation variation amplitude.therefore can think relatively stable in natural cooling conditions for ZS3、ZS7、ZS4. stomata photosynthesis less effect.2.Will photosynthetic indicators for comprehensive factor analysis.Through that correlation analysis between the main indexes instantaneous photosynthesis mutual relationship.Namely net photosynthetic rate as stomatal conductance.intercellular CO₂ concentration.stomatal limitation and water use use increases.but with these variables significantly does not exist between sexual relations.And water use efficiency.the higher the transpiration rate is lower.The principal component analysis ZS3、ZS4and that the comprehensive factor score ZS5 composite scores highest, minimum.Namely the circumstance that drops in temperature in nature.ZS4、ZS3 and camphor trees, to select the best.growth situation ZS1、ZS2、ZS7 growth with less. ZS5、ZS6growing status of the worst.Through the tree graph clustering results can be know, in photosynthetic main index as a classification standard.seven strains can be divided into four classes, camphor tree.Namely ZS1、ZS2 and ZS3、ZS7 for category.for ZS4 category.and ZS5for category.andZS6 for category.Using the principal component analysis and cluster analysis method to appraisal camphor frost-resistant choice.overcome traditional biological indicators and physical and chemical indexes are difficult to combined with defects.In the Yellow River basin for further growth excellent camphor tree cultivating wintering, theoretical foundation.