| The carbon isotope composition of C_3 herbaceous plants in loess area of northern China |
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| 作者姓名： | 王国安 韩家懋 刘东生 |
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| 作者单位： | 王国安(College of Environmental Sciences, Peking University, Beijing 100871, China; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China);韩家懋,刘东生(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China) |
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| 摘 要： | The application of stable carbon and oxygen isotopes in study of paleoenvironment has been becoming more and more extensive. It is well known that the d 18O curves of foraminifer crust in deep oceanic sediments and ice cores have made a great contribution…
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The carbon isotope composition of C3 herbaceous plants in loess area of northern China |
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| Abstract: | δ13C of 367 C3 herbaceous plants was measured in loess area in northern China. Their δ13C values vary between -21.7‰ and -30.0‰, with a mean of -26.7‰. In the center of Loess Plateau(semimoist area) with annual precipitation-28.5‰, with a mean of -27.5‰. In the west of Loess Plateau(semiarid and aridarea) with annual precipitation less than 400 mm, they range between -21.7‰ and -30.0‰, with a mean of -26.2‰. Annual precipitation is the main factor that makes δ13C values of C3 herbaceous plants in the west greater than those in thecentral Loess Plateau. The composition of δ13C in C3 plants increases with deceasing annual precipitation, and the mean change is -0.49‰/100 mm. |
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| Keywords: | C3 herbaceous plants carbon isotope loess area annual precipitation |
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