Study on Photosynthetic Characteristics of FourA lnus cremastogyne Varieties under DifferentCO2 Concentrations
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1.
Cen tral SouthUn ivers ity of Forestry and T echnology, Changsh a?? 410004, Hu# nan, Ch ina
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2.
Hunan Academy of Forestry, Changsh a?? 410004, Hunan, Ch ina
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3.
3. Research In stitu te of Forestry, CAF, Beijing?? 100091, Ch ina
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4.
Research In stitu te of Forestry, CAF, Beijing?? 100091, Ch ina
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Received Date:
2007-04-12
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Abstract
In order to ut ilize the superior variet ies o fA lnus cremastogyne sc ientif ica lly, the photosynthetic characteristics o f fourA lnu s cremastogyne fam ilies, H1, H12, J5 and J10, w ere stud ied under different CO2 concentrations atseedling stage. The results w ere as follow s: ( 1)W ith the increase o fCO2 concentration, the net photosynthet ic rate offourA lnus cremastogyne varieties show ed ascending trend, the irCO2 compensation po int w ere from 39μmo l?mol-1to 154μmol?mol-1, and their CO2 saturat ion po in tw ere from 800μmo l?mol-1 to 2 000μmol?mol-1. The highest va lue of Pm show ed in June, Wh ile the low est in O ctember; ( 2)W ith the increase of CO2 concentrat ion, thecarboxylat ion efficiency( CE) o f fourA lnus cremastogyne varietiesw ere betw een 0. 001 5 and 0. 051 5, andH 1, H12presented greater CE, So their high temperature tolerance ab ility w as stronger than that o f J5 and J10; w hile H12show ed stronger photosynthetic efficiency thanH 1; ( 3)W ith the increase of CO2 concentration, the transpirationrate ( Tr) and stom atal conductance ( Cond) decreased, wh ile the in terce llu lar CO2 concentration ( C i) increased.The low est eigenvalue o fTr, C i and Cond show ed in October; and the performance o fH12 and J10 w as rather g reater thanH1 and J5. So irragration in Autumn and drough t-resistance variety selection p layed important ro le in grow thofA lnus cremastogyne. ( 4) The vapor deflic it at the leaf surface o fA lnus cremastogyne varieties increased slow ly w iththe increase o f CO2 concentra tion.
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Proportional views
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