| Carbon isotope ratios of C_4 plants in loess areas of North China |
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| 作者单位： | WANG Guoan1，2，3，HAN Jiamao 2，ZHOU Liping3，XIONG Xiaogang4，TAN Ming2，WU Zhenhai5 & PENG Jun6 1. Department of Plant Nutrition，China Agricultural University，Beijing 100094，China; 2. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China; 3. College of Environmental Sciences，MOE Laboratory for Earth Surface Processes，Peking University，Beijing 100871，China; 4. Institute of Botany，Chinese Academy of Sciences，Beijing 100093，China; 5. Northwest Sci-Tech University of Agriculture and Forestry，Yangling 712100，China; 6. Network Center，China Agricultural University，Beijing 100094，China |
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| 摘 要： | Recent stable carbon isotope studies have shown that the occurrence of C4 plants on the Earth was much later than that of C3 plants and there was a global ex-pansion of C4 biomass around 5―8 million years ago1]. Although far fewer species use the C4 pat…
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Carbon isotope ratios of C4 plants in loess areas of North China |
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| Authors: | WANG Guoan HAN Jiamao ZHOU Liping XIONG Xiaogang TAN Ming WU Zhenhai PENG Jun |
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| Abstract: | Carbon isotope ratios (δ13C) of 89 C4 plant samples were determined from the loess area in North China. δ13C values vary between -10.5‰ and -14.6‰ with a mean of -12.6‰. Along a precipitation gradient from the semi-moist area to the semiarid area, then to the arid area, the δ13C values of C4 plants show a slight decreasing trend. The δ13C values of C4 plants in the dry season are found lower than those in the wet season. These trends are opposite to those observed for C3 species. |
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| Keywords: | C4 plants carbon isotope ratios loess area |
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