The Characteristics of Carbon Isotope Composition of Modern Plants over Qinghai-Tibet Plateau (NE) and Its Climatic Information

LI Xiang bo; CHEN Jian fa; ZHANG Ping zhong; LIU Guang xiu

Global change become a world wide concerned problem in the recent years. The study of plant carbon isotopic composition become an important field in the research of global change,in which a fundamental goal is to determine the contro ling factors of plant carbon isotope discrimination and composition. The paper gives an analysis on the carbon isotope composition of modern plants ( all are C₃ species) in Qinghai-Tibet plateau(NE)and a detailed discussion on t he various factors that can influence it. The value of δ¹³C of 61 samples varies from -23.5‰ to -30.8‰，with an average of -26.6‰. Analysis shows that with the same plant the δ¹³C value increases with the increase of altitu de and decresases with the increase of latitude.The result of this study shows t hat precipitation,air moisture and pressure are the most important environmental factors to the change of δ¹³C. The less the amount of precipitation, the more positive the plant δ¹³C values are. On the other hand,the higher th e air pressure the more negative the δ¹³C values are. It is now clear tha t plant δ¹³C value relates directly to the assimilation of leaf to CO₂( A),leaf stomatic conductance(g) and intercellular/ambient partial pressure ratio (Pi/Pa). A(cording to) their effect on A, g and Pi/Pa,it is clear that the precipitation, air moisture and pressure cause the change of plant δ¹³C value. The study suggests that a lot of information reflecting the change of nature env ironmental can be recorded in plants.So it is completely possible to extract cli matic information from plant δ¹³C.

The Characteristics of Carbon Isotope Composition of Modern Plants over Qinghai-Tibet Plateau (NE) and Its Climatic Information

1. Northwest Institute of Geology, CUNPE Lanzhou 730020;

2. Lanzhou Institute of Geology Chinnse Academy of Sciences Lanzhou 730000

Received Date: 1998-03-04

Rev Recd Date: 1998-07-30

Publish Date: 1999-06-10

Key words:

Qinghai-Tibet /
plateau /
(NE) /
C₃ /
plants'

Abstract: Global change become a world wide concerned problem in the recent years. The study of plant carbon isotopic composition become an important field in the research of global change,in which a fundamental goal is to determine the contro ling factors of plant carbon isotope discrimination and composition. The paper gives an analysis on the carbon isotope composition of modern plants ( all are C₃ species) in Qinghai-Tibet plateau(NE)and a detailed discussion on t he various factors that can influence it. The value of δ¹³C of 61 samples varies from -23.5‰ to -30.8‰，with an average of -26.6‰. Analysis shows that with the same plant the δ¹³C value increases with the increase of altitu de and decresases with the increase of latitude.The result of this study shows t hat precipitation,air moisture and pressure are the most important environmental factors to the change of δ¹³C. The less the amount of precipitation, the more positive the plant δ¹³C values are. On the other hand,the higher th e air pressure the more negative the δ¹³C values are. It is now clear tha t plant δ¹³C value relates directly to the assimilation of leaf to CO₂( A),leaf stomatic conductance(g) and intercellular/ambient partial pressure ratio (Pi/Pa). A(cording to) their effect on A, g and Pi/Pa,it is clear that the precipitation, air moisture and pressure cause the change of plant δ¹³C value. The study suggests that a lot of information reflecting the change of nature env ironmental can be recorded in plants.So it is completely possible to extract cli matic information from plant δ¹³C.

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Reference (14)

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The Characteristics of Carbon Isotope Composition of Modern Plants over Qinghai-Tibet Plateau (NE) and Its Climatic Information

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