Research on Branching and Photosynthetic Utilization of Oil-tea Camellia with Different Tree Shapes

CAO Yong-qing; YAO Xiao-hua; WANG Kai-liang; LONG Wei; LIN Ping; REN Hua-dong

The branching, photosynthetic utilization and the response to pruning of oil-tea camellia (Camellia oleifera Abel.) with different tree shapes were studied. The results showed that the tree shape index of selected oil-tea camellia clones was between 0.72 and 1.33 in the sequence of ‘changlin175’>‘changlin40’>‘changlin53’>‘changlin4’>‘changlin46’. The tree shape of ‘changlin175’ and ‘changlin40’ belonged to upright type due to their higher tree shape index and the‘changlin4’and‘changlin46’ were open type. "changlin53" was moderate. The branching number, length of shoot, new leaves ratio, net photosynthetic rate and water use efficiency (WUE) were higher in the upper layer of canopy than that in lower and inner layer of canopy. With the increase of tree shape index, the length of shoot, new leaves ratio, net photosynthetic rate and WUE increased at initial stage and then decreased, and the difference of branching number, new leaves ratio among different parts of canopy became bigger, while the difference of shoot length became smaller. The length of shoot, new leaves ratio, net photosynthetic rate were the highest in ‘changlin53’ whose tree shape index was moderate. The diurnal variation of PAR reflectivity in oil-tea camellia showed an upward trend after the first drop and the diurnal variation of PAR interception rate was opposite. The upright type ‘changlin175’ showed higher PAR reflectivity and lower PAR interception rate than that of open type ‘changlin4’. The branching number of upright type oil-tea camellia clones decreased significantly, while the branching number and shoot length of inner layer canopy of open type oil-tea camellia clones increased significantly after the treatment of pruning. The PAR interception rate decreased and the net photosynthetic rate and WUE of inner layer canopy increased apparently after pruning treatment.

1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China

Received Date: 2013-06-03

Abstract: The branching, photosynthetic utilization and the response to pruning of oil-tea camellia (Camellia oleifera Abel.) with different tree shapes were studied. The results showed that the tree shape index of selected oil-tea camellia clones was between 0.72 and 1.33 in the sequence of ‘changlin175’>‘changlin40’>‘changlin53’>‘changlin4’>‘changlin46’. The tree shape of ‘changlin175’ and ‘changlin40’ belonged to upright type due to their higher tree shape index and the‘changlin4’and‘changlin46’ were open type. "changlin53" was moderate. The branching number, length of shoot, new leaves ratio, net photosynthetic rate and water use efficiency (WUE) were higher in the upper layer of canopy than that in lower and inner layer of canopy. With the increase of tree shape index, the length of shoot, new leaves ratio, net photosynthetic rate and WUE increased at initial stage and then decreased, and the difference of branching number, new leaves ratio among different parts of canopy became bigger, while the difference of shoot length became smaller. The length of shoot, new leaves ratio, net photosynthetic rate were the highest in ‘changlin53’ whose tree shape index was moderate. The diurnal variation of PAR reflectivity in oil-tea camellia showed an upward trend after the first drop and the diurnal variation of PAR interception rate was opposite. The upright type ‘changlin175’ showed higher PAR reflectivity and lower PAR interception rate than that of open type ‘changlin4’. The branching number of upright type oil-tea camellia clones decreased significantly, while the branching number and shoot length of inner layer canopy of open type oil-tea camellia clones increased significantly after the treatment of pruning. The PAR interception rate decreased and the net photosynthetic rate and WUE of inner layer canopy increased apparently after pruning treatment.

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Research on Branching and Photosynthetic Utilization of Oil-tea Camellia with Different Tree Shapes

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