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[1]DING Xiao-gang,HE Qian,LI Ji-yue,et al.The Photosynthetic Characteristics of Pinus Sylvestris var. Mongolica and Pinus Tabulaeformis in Mu Us Sandland[J].Research of Soil and Water Conservation,2011,18(01):215-219.

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The Photosynthetic Characteristics of Pinus Sylvestris var. Mongolica and Pinus Tabulaeformis in Mu Us Sandland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 18 Number of periods: 2011 01 Page number: 215-219 Column: Public date: 2011-02-20

Title:: The Photosynthetic Characteristics of Pinus Sylvestris var. Mongolica and Pinus Tabulaeformis in Mu Us Sandland

Author(s):: DING Xiao-gang^1,2, HE Qian³, LI Ji-yue³, ZHANG Fang-qiu², LIU Yu-xian⁴; 1. The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China;
2. Guangdong Forest Research Institute, Guangzhou 510520, China;
3. College of Forestry, South China Agricultural University, Guangzhou 430070, China;
4. Forestry Technology Extended Central Station of Mianyang, Mianyang, Sichuan 621000, China

Keywords:: Pinus sylvestris var.mongolica; Pinus tabulaeformis; gas exchange; net photosynthetic rate; water use efficiency; Mu Us sandland

CLC:: S718.43

DOI:: -

Abstract:: In the growing season, the daily gas exchange, water use efficiency of Pinus sylvestris var. mongolica and Pinus tabulaeformis in Mu Us sandland were measured with a portable Li-6400 gas analysis system under natural conditions. The results showed that the diurnal courses of net photosynthetic rate and transpiration rate display a singal-peak pattern. Water use efficiency culminates in the early morning. The maximum and the average value of the net photosynthesis of the Pinus sylvestris var. mongolica is larger than that of the Pinus tabulaeformis. The average value of the water use efficiency of Pinus sylvestris var. mongolica is 3.63 μmol CO₂/mmolH₂O, which was higher than that of Pinus tabulaeformis (3.22 μmol CO₂/mmol H₂O). Regression analysis showed that the net photosynthetic rate of Pinus sylvestris var. mongolica was controlled by PAR, G_s and C_i, while for Pinus tabulaeformis was PAR and G_s.

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