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[1]PENG Shunlei,YOU Wenhui,WANG Qiang,et al.Characteristics of the Leaf Carbon Isotope in the Castanopsis fargesii Canopy and Their Relationship to Photosynthetic Parameters in the Tiantong Mountain[J].Research of Soil and Water Conservation,2016,23(03):274-277.

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Characteristics of the Leaf Carbon Isotope in the Castanopsis fargesii Canopy and Their Relationship to Photosynthetic Parameters in the Tiantong Mountain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 03 Page number: 274-277 Column: Public date: 2016-06-28

Title:: Characteristics of the Leaf Carbon Isotope in the Castanopsis fargesii Canopy and Their Relationship to Photosynthetic Parameters in the Tiantong Mountain

Author(s):: PENG Shunlei^1,2, YOU Wenhui¹, WANG Qiang¹, JIANG Yue¹, YU Huaguang¹; 1. Key Laboratory of Ecological Restoration in the Hilly Area, Pingdingshan University, Pingdingshan, He’nan 467000, China;
2. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China

Keywords:: Castanopsis fargesii; canopy; leaf carbon isotope; maximum assimilation rate (A_max); leaf nitrogen content per unit mass (N_mass)

CLC:: S718.5

DOI:: -

Abstract:: Leaf carbon isotopic depletion exists in plant canopy, which indicates the photosynthetic heterogeneity of canopy. In order to study the temporal and spatial changes of leaf δ¹³C along canopy vertical gradient, and test whether the hypothesis of tree height limit from hydraulic limitation is true in the Castanopsis fargesii, the values of leaf δ¹³C, maximum assimilation rate (A_max), and leaf nitrogen content per unit mass (N_mass) were measured from crown to 8 m crown below in different months. The results showed that the different months and canopy heights significantly affected on canopy leaf δ¹³C (p < 0.01). The mean value of leaf δ¹³C ranged from -28.61‰ to -31.67‰ along canopy vertical gradients from crown to 8 m crown below, and significantly linearly decreased with the decrease of canopy heights (R²=0.727, p < 0.001). Canopy leaf δ¹³C significantly increased with the increase of A_max and N_mass (p < 0.000 1), and their relationship followed the logarithmic curve very well (R²=0.514 for A_max, and R²=0.610 for N_mass), which proved that the hypothesis of tree height limit from hydraulic limitation seems to be unlikely in the Castanopsis fargesii.

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