A Compar ison Study on the Photosyn thesis Character isticfor Introduction of Ca ta lpa in J ianghua i Area

SUN Jia; LIU Hong-jian; FU Yu-lan; LI Hong-kai

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.

1. International Centre for Bambaoo and Ratten, Beijing　100102, China

2. School of Forestry and Landscape Architecture,Anhui Agricultural University, Hefei　230036, Anhui, China

3. Forestry Academy of Anhui Province, Heifei　230031, Anhui, China

Received Date: 2006-09-03

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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Reference (12)

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A Compar ison Study on the Photosyn thesis Character isticfor Introduction of Ca ta lpa in J ianghua i Area

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