|Table of Contents|

Study on Photosynthetic Diurnal Variation in Leaves of Cerasus humilis (Bunge) Sok.in Autumn(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2012年09期
Page:
6-9
Research Field:
Publishing date:

Info

Title:
Study on Photosynthetic Diurnal Variation in Leaves of Cerasus humilis (Bunge) Sok.in Autumn
Author(s):
CHE Jia-xiang; XIE Yuan-gui; PENG Xi; LI An-ding
Research Center of Guizhou Karst Environment and Resource Development，Guiyang，Guizhou 550001
Keywords:
Cerasus humilis (Bunge) Sok.; diurnal variation of photosynthesis; net photosynthetic rate; eco-physiological factors
PACS:
Q 945.79
DOI:
-
Abstract:
The eco-physiological photosynthetic characteristics of Cerasus humilis (Bunge) Sok.leaves in two-year-old seedlings and the environmental factors were measured using Li-6400 portable photosynthesis system in the fall，also the main impact factors of the leaf net photosynthetic rate were investigated by using correlation analysis and stepwise regression analysis.The results showed that diurnal change of net photosynthetic rate(Pn) of C.humilis presented a bimodal pattern,the first peak(Pn=7.96 μmol?m-2?s-1) appeared at 10 o＇clock and the second peak(Pn=6.26 μmol?m-2?s-1) appeared at 15 o＇clock，and in midday there was a certain degree of photosynthetic depression.The diurnal variations of Pn related significant positively to that of stomatal conductance(Gs)，leaf transpiration(Tr) and photosynthetically active radiation(PAR),but related significant negatively to that of intercellular carbon dioxide concentration(Ci) and air relative humidity(RH).The main reasons of midday photosynthetic depression was stomatal limitation factors reduced by stomatal closure.Gsand Ciwere the key factors exerting an influence on Pnof C.humilis，and Gs produced more influence than Ci.

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Last Update: 2014-09-01