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

Yuxian Liu

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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 μmolCO2/mmolH2O,which was higher than that of Pinus tabulaeformis(3.22 μmol CO2/mmolH2O).Regression analysis showed that the net photosynthetic rate of Pinus sylvestris var.mongolica was controlled by PAR,Gs and Ci,while for Pinus tabulaeformis was PAR and Gs.

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What this paper is about

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 μmolCO2/mmolH2O,which was higher than that of Pinus tabulaeformis(3.22 μmol CO2/mmolH2O).Regression analysis showed that the net photosynthetic rate of Pinus sylvestris var.mongolica was controlled by PAR,Gs and Ci,while for Pinus tabulaeformis was PAR and Gs.

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Available 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 μmolCO2/mmolH2O,which was higher than that of Pinus tabulaeformis(3.22 μmol CO2/mmolH2O).Regression analysis showed that the net photosynthetic rate of Pinus sylvestris var.mongolica was controlled by PAR,Gs and Ci,while for Pinus tabulaeformis was PAR and Gs.

Key concepts: Pinus tabulaeformis, Pinus <genus>, Photosynthesis, Transpiration, Botany, Horticulture, Biology

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The Photosynthetic Characteristics of Pinus Sylvestris var. Mongolica and Pinus Tabulaeformis in Mu Us Sandland — Research Paper | ScholarLens