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[目的]研究CO2增加对榆树、江孜沙棘光合特性的影响。[方法]利用Li-6400型便携式光合测定系统研究拉萨半干旱河谷地区主要造林树种榆树、江孜沙棘在不同CO2浓度下的光合特性。[结果]在弱光下榆树净光合速率较低,而强光下较高;随着CO2浓度增加,榆树的水分利用效率大幅增加。江孜沙棘对CO2浓度升高具有较好的适应性,使江孜沙棘同化CO2的能力和对光能利用效率提高,但当CO2浓度超过600μmol/mol时,其光合作用稍有下降。CO2浓度升高后提高了江孜沙棘对水分的利用效率。[结论]榆树和江孜沙棘具有喜光和抗旱性较强的特性,适宜在半干旱地区栽培。
[Objective] The research aimed to study the effects of CO2 enrichment on the photosynthetic characteristics of seabuckthorn and elm in Yili and Gyangze. [Method] With Li-6400 portable photosynthesis system, photosynthetic characteristics of elm and Giza seabuckthorn under different CO2 concentrations were studied in semi-arid valley of Lhasa. [Result] The net photosynthetic rate of elm under low light was lower than that under high light, and the water use efficiency of elm increased significantly with the increase of CO2 concentration. Seabuckthorn has good adaptability to the increase of CO2 concentration, and the ability of assimilating CO2 and the utilization efficiency of light energy of seabuckthorn in Gyangze improve. However, the photosynthesis of seabuckthorn decreases slightly when CO2 concentration exceeds 600 μmol / mol. The increase of CO2 concentration increased the water use efficiency of seabuckthorn. [Conclusion] The elm trees and the Jiangzi sea buckthorn had the characters of hi-light and drought-resistance, and was suitable for cultivation in the semi-arid area.