Relationship between Tree Composition and Light Utilization of Camellia oleifera

DUAN Wei-hua; YUAN De-yi; GAO Chao; GONG Chun; LEI Xiao-lin; LIAO Ting

In order to explore the suitable tree composition in the cultivation management, 11-year-old Camellia oleifera trees were used as the test material, the relative light intensity and net photosynthetic rate in different canopy position of C. oleifera were studied by training and pruning. The results showed that the relative light intensity at the external middle layer of C. oleifera of open center shape, natural roundhead shape and CK were 44.33%, 28.72% and 25.81% respectively; the relative light intensity at the internal middle layer of C. oleifera of open center shape, natural roundhead shape and CK were 14.70%, 7.13% and 1.21% respectively. The peak of net photosynthetic rates in different layers and positions of open center shaped C. oleifera were higher than that of the natural roundhead shape. Compared with natural roundhead shaped C. oleifera, the peak of net photosynthetic rate of the external and internal upper layers were 2.47 μmol·m-2·s-1 and 0.43 μmol·m-2·s-1 higher, that of the external and internal middle layers were 1.10 μmol·m-2·s-1 and 0.18 μmol·m-2·s-1 higher, that of the external and internal lower layers were 0.32 μmol·m-2·s-1 and 1.44 μmol·m-2·s-1 higher respectively. Moreover, the net photosynthetic rate of the both shapes were higher than that of the CK. Considering the photosynthetic efficiency, training and pruning C. oleifera to be open center shape had a better effect.

1. The Key Lab.of Non-wood Forest Product of Forestry Ministry, Central South University of Forestry and Technology, Changsha 410004, Hunan, China

2. Jiangxi Academy of Forestry, Nanchang 330013, Jiangxi, China

Received Date: 2012-04-18

Abstract: In order to explore the suitable tree composition in the cultivation management, 11-year-old Camellia oleifera trees were used as the test material, the relative light intensity and net photosynthetic rate in different canopy position of C. oleifera were studied by training and pruning. The results showed that the relative light intensity at the external middle layer of C. oleifera of open center shape, natural roundhead shape and CK were 44.33%, 28.72% and 25.81% respectively; the relative light intensity at the internal middle layer of C. oleifera of open center shape, natural roundhead shape and CK were 14.70%, 7.13% and 1.21% respectively. The peak of net photosynthetic rates in different layers and positions of open center shaped C. oleifera were higher than that of the natural roundhead shape. Compared with natural roundhead shaped C. oleifera, the peak of net photosynthetic rate of the external and internal upper layers were 2.47 μmol·m-2·s-1 and 0.43 μmol·m-2·s-1 higher, that of the external and internal middle layers were 1.10 μmol·m-2·s-1 and 0.18 μmol·m-2·s-1 higher, that of the external and internal lower layers were 0.32 μmol·m-2·s-1 and 1.44 μmol·m-2·s-1 higher respectively. Moreover, the net photosynthetic rate of the both shapes were higher than that of the CK. Considering the photosynthetic efficiency, training and pruning C. oleifera to be open center shape had a better effect.

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Reference (13)

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Relationship between Tree Composition and Light Utilization of Camellia oleifera

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