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2002•Journal of Lanzhou UniversityRequires access

Preliminary study on direction variabilities of stable carbon isotope ratios and its mechanisms in trees

Tang Hong-guan

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Abstract

Stable carbon isotope ratios (δ 13C values) and photosynthetic pigments in a 1000 a cypress (Sabina przewalskii) were investigated. The direct variations of δ 13C values were significant,with the highest δ 13C values in the north and the lower δ 13C values in the west.The changes of chlorophyll,carotoniod and flavoniod contents in tree leaves were similar to δ 13C variations.The results indicated that the latter was a long-term adaptation to local differences of light radiation,while the former was attributed to the effect of light radiation on photosynthesis and respiration.

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What this paper is about

Stable carbon isotope ratios (δ 13C values) and photosynthetic pigments in a 1000 a cypress (Sabina przewalskii) were investigated. The direct variations of δ 13C values were significant,with the highest δ 13C values in the north and the lower δ 13C values in the west.The changes of chlorophyll,carotoniod and flavoniod contents in tree leaves were similar to δ 13C variations.The results indicated that the latter was a long-term adaptation to local differences of light radiation,while the former was attributed to the effect of light radiation on photosynthesis and respiration.

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Available abstract

Stable carbon isotope ratios (δ 13C values) and photosynthetic pigments in a 1000 a cypress (Sabina przewalskii) were investigated. The direct variations of δ 13C values were significant,with the highest δ 13C values in the north and the lower δ 13C values in the west.The changes of chlorophyll,carotoniod and flavoniod contents in tree leaves were similar to δ 13C variations.The results indicated that the latter was a long-term adaptation to local differences of light radiation,while the former was attributed to the effect of light radiation on photosynthesis and respiration.

Key concepts: δ13C, Photosynthesis, Isotopes of carbon, Stable isotope ratio, Respiration, Cypress, Atmospheric sciences, Environmental science

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