- 作者: HSUEH-WEN YEH AND WEI-MIN WANG
- 中文摘要: The stable isotope composition of the light elements (i.e., H, C, N, O and S) of organic samples varies significantly and, for C, is also unique and distinct from that of inorganic carbon. This is the result of (1) the isotope composition of reactants, (2) the nature of the reactions leading to formation and post-formational modification of the samples, (3) the environmental conditions under which the reactions took place, and (4) the relative concentration of the reactants compared to that of the products (i.e., [products]/[reactants] ratio). This article will examine the carbon isotope composition of terrestrial plant materials and its relationship with the above factors. .delta./sup 13/C/sub PDB/ values of terrestrial plants range approximately from -8 to -38.per mill., inclusive of C3-plants (-22 to -38.per mill.), C4-plants (-8 to -15.per mill.) and CAM-plants (-13 to -30.per mill.). Thus, the .delta./sup 13/C/sub PDB/ values largely reflect the photosynthesis pathways of a plant as well as the genetics (i.e., species difference), .delta./sup 13/C/sub PDB/ values of source CO2, relevant humidity, CO2/O2 ratios, wind and light intensity etc. Significant variations in these values also exist among different tissues, different portions of a tissue and different compounds. This is mainly a consequence of metabolic reactions. Animals mainly inherit the .delta./sup 13/C/sub PDB/ values of the foods they consume; therefore, their .delta./sup 13/C/sub PDB/ values are similar. The .delta./sup 13/C/sub PDB/ values of plant materials, thus, contain information regarding the inner workings of the plants, the environmental conditions under which they grow, the .delta./sup 13/C/sub PDB/ values of CO2 sources etc., and are unique. Furthermore, this uniqueness is passed on to their derivative matter, such as animals, humus etc. Hence, they are very powerful tools in many areas of research, including the ecological and environmental sciences.
- 英文摘要: --
- 中文關鍵字: stable isotope, terrestrial plant, ecology, environmental science
- 英文關鍵字: --