A Compar ison Study on the Photosyn thesis Character isticfor Introduction of Ca ta lpa in J ianghua i Area
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1.
International Centre for Bambaoo and Ratten, Beijing 100102, China
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2.
School of Forestry and Landscape Architecture,Anhui Agricultural University, Hefei 230036, Anhui, China
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3.
Forestry Academy of Anhui Province, Heifei 230031, Anhui, China
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Received Date:
2006-09-03
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Abstract
The photosynthetic characteristics for 4 cultivars of Cata lpa were studied in field on typ ical sunny days .The results as follows: (1) For Changguoqiu, Mimaohuiqiu, C. fargesii and Guangyeqiu , their light saturation pointwas 1 200μmol·m-2·s-1 ; And the compensation point of photosynthesis varied, which were 53. 34, 64. 82, 66. 74and 98. 91μmol·m-2·s-1 , respectively; (2) The apparent quantum yields (AQY) were 0. 427, 0. 393, 0. 354 and0. 349, respectively. For the 4 cultivars of Catalpa, Changguoqiu had the highest value of Pn , Tr and Cs, and C.fargesii andMimaohuiqiu were the second and the Guangyeqiu were the lowest when photosynthetic active radiation(PAR) was higher than 1 000μmol·m-2·s-1. Meanwhile, The value of Ci in leaves of the 4 cultivars of Catalpadeclined gradually. Changguoqiu was the lowest and the highest in Guangyeqiu. (3) Through regression analysis ofthe ecological factors , the authors obtained that Changguoqiu had the highest photosynthetic characteristics, and itwould p rovide fundamental information for building of Changguoqiu district between Yangtze Riverpto Huaihe Riverp.
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Proportional views
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