| 植物-土壤有机质转化过程中的碳同位素组成变化 |
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| 关键词:carbon isotope soil plant transform |
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| Carbon Isotopic Variation of the Organic Matter During the Plant-Soil Transformation |
| Carbon isotopic composition of the soil organic mateer (SOM) reflects the situation of the growing plants and climates. However, when the plants are decomposed and utilized by the microbe, carbon isotopic fractionation is likely to occur. The authors studied the variation of the carbon isotopic composition during the transformation of plants into SOM in two different climates and en-vironments of alpine meadow and typical grasslang. Some results have been obtained: At the four sampling eites in the Taibai Moun-tain of high altitude, the soil δ13Corg values gradually become ore positive with the increasing depth, and the soil δ13Corg values gradually become more positive with the increasing depth, and the soil δ13Corg values be-come stable at 10-15cm. The soilδ13Corg values of longtime stabilization are some 1.65‰-2.27‰(1.9‰ on average) more positive to the source plants. At the four grasslang sampling sites in Inner Mongolia, similar results have been obtained: the soil δ13Corg values become more positive with the increasing depth, and tend to be stable at 10-16cm. The soil δ13Corg values of the 10-16 cm depth is 1.3‰,1.4‰, 1.4‰, and 1.2‰ more positive to the source plants, respectively. When we apply the soil organic carbon isotope to the study of paleovegetation and paleoclimate, we should consider the influence of the carbon isotopic fractionation during the transfor-mation of plants into SOM in different climates and environments. |
| NING Youfeng,LIU Weiguo,AN Zhisheng.2005.Carbon Isotopic Variation of the Organic Matter During the Plant-Soil Transformation[J].Acta Geoscientica Sinica,26(z1):-236. |
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