Photosynthetic Characteristics for Mongolian Scots Pine Plantation and its Relation with Environmental Factors

Abstract:

The needles' light dynamic response for net photosynthetic rate (Pn), the diurnal changes of net photosynthetic rates of annual Mongolian Scots pine and the relationship between of its Pn and environmental factors were studied in this paper by using LI-6400 portable photosynthesis system. Results show that needles at different positions of the crown have different light response for their net photosynthetic rate. Pn, photosynthetic saturated light intensity (PSLI) and light compensation point (LCP) of needles decreased from upper-crown through mid-crown to lower-crown. It suggests that different light dynamic responses of needles at different positions be related to micro-light environment to which needles acclimated in a long time. Diurnal variation of Pn showed a single peak. It had significantly positive correlation with stomatal conduction (Cond), transpiration rate (Tr) (at 0.01 level) and photosynthetically active radiation (PAR) (at 0.05 level), and significantly negative correlation with the intercellular CO2 concentration (Ci) (at 0.05 level).

• Periodical: Advanced Materials Research (Volumes 393-395)
• Pages: 1334-1340
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.393-395.1334
• Online since: November 2011
• Authors: Jie Zhang, Zhao Gang Liu
• Keywords: Diurnal Changes, Environmental Factor, Light Respons, Mongolian Scots Pine Plantation, Net Photosynthetic Rate

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