Daily variation of photosynthesis of six tree species under Pinus elliotii forest and their relations with environmental factors

doi:10.3969/j.jssn.1000-2006.2011.05.030

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2011, Vol. 35 ›› Issue (05): 135-138.doi: 10.3969/j.jssn.1000-2006.2011.05.030

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Daily variation of photosynthesis of six tree species under Pinus elliotii forest and their relations with environmental factors

WU Tonggui¹,ZENG Guangquan*

1.Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400，China;2.Research Institute of Forestry of Jian County， Jian 343100,China;3.Ningguo Forestry Bureau, Ningguo 242300, China

Online:2011-09-30 Published:2011-09-30

Abstract

Abstract: Daily variations of net photosynthesis rates (Pn) of 6 tree species in red soil under Pinus elliotii forest were determined and their relation with environmental factors were analyzed using path analysis. The daily courses of Quercus acutissima, Schima superba, Castanopsis fissa and Lespedeza bicolor showed unimodal curves, with the maximum of （1982±266）, （1458±179）, （1611±482）, （1492±367） μmol/（m2〖DK〗·s） at 11:00 am, and Adinandra millettii, Photinia davidsoniae presented bimodal curves, with the maximum of （891±181）, （1085±163） μmol/（m2〖DK〗·s）. The sequence of daily average of Pn was Q. acutissima >S. superba > C. fissa > L. bicolor > A. millettii > Ph. davidsoniae, and significant differences were found among Q. acutissima, S. superba, C. fissa and A. millettii, Ph. davidsoniae (p＜005). Based on pathway analysis, Pn was mainly influenced by vapor press deficit (VPD), temperature (T), relative humidity (RH) and photosynthetic active radiation (PAR) for Q. acutissima, C. fissa and L. bicolor. While S. superba was mainly influenced by VPD, T and PAR. Whereas for A. millettii and Ph. davidsoniae

CLC Number:

S718

WU Tonggui,ZENG Guangquan*. Daily variation of photosynthesis of six tree species under Pinus elliotii forest and their relations with environmental factors[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2011, 35(05): 135-138.

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Daily variation of photosynthesis of six tree species under Pinus elliotii forest and their relations with environmental factors

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