Abstract
On the basis of different photosynthetic pathways, there is an obvious difference in δ13C values between C3 plants and C4 plants. In terms of this characteristic, we analyzed the δ13C values in different size and density fractions from two profile-soil samples either in farmland and forestlands near the Maolan Karst virgin forest, Southwest China, where there were developed C3 plants previously and now are C4 plants. Results showed that the δ13C values of different size fractions in forestland soil are δl3Ccoarse sand < δ13Cfine sand < δ13Ccoarse silt < δ13Cclay < δ13 Cfine silt, and the δ13 C values of different size fractions in farmland soil are δ13 Ccoarse sand > δ13 Cfine sand > δ13 Ccoarse silt > δ13 Cclay > δ13 Cfine silt, indicating that soil organic matter is fresh in coarse sand and oldest in fine silt. The δ13 C values of different density fractions in forestland soil are δ13 Clight < δ13 Cheavy, and the δ13 C values of different density fractions in farmland soil are δ13Clight > δ13Cheavy, indicating that the soil organic matter is fresh in light fractions and old in heavy fractions.
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Anderson, D. W. and E. A. Paul, 1984, Organo-mineral complexes and their study by radio carbon dating [J]: Soil Science Society of America Journal, v. 48, p. 298–301.
Anderson, D. W., S. Saggar, J. R. Bettany and J. W. B. Stewart, 1981, Particle size fractions and their use in studies of soil organic matter; I. The nature and distribution of forms of carbon, nitrogen and sulfur [J]: Soil Science Society of America Journal, v. 45, p. 767–772.
Balesdent, J., A. Mariotti, and B. Guillet, 1987, Nature13C abundance as a tracer for soil organic matter dynamics studies [J]: Soil Biology and Biochemistry, v. 19, p. 25–30.
Bayer, C., J. Mielniczuk, L. Martin-Neto, and P. R. Ernani, 2002, Stocks and humification degree of organic matter fractions as affected by no-tillage on a subtropical soil [J]: Plant and Soil, v. 238, p. 133–140.
Boutton, J. W., 1983, Comparison of quartz and pyrex tubes for combustion of organic samples for stable carbon isotope analysis [J]: Analytical Chemistry, v. 55, p. 1832–1833.
Cerri, C., C. Feller, J. Balesdent et al., 1985, Application du tracage isotopique naturel en13C a l’ etude de la dynamique de la matiere organique dans les sols [J]: Comptes Rendus de 1 ’ Acadademie des Sciences de Paris T. 300, II, v. 9, p. 423–428.
Christensen B. T., 1992, Physical fractionation of soil and organic matter in primary particle size and density separates [J]: Adv. in Soil Sci., v. 20, p. 1–90.
Collins, H. P., E. T. Elliott, K. Paustian et al., 2000, Soil carbon pools and fluxes in long-term corn belt agroecosystems [J]: Soil Biology and Biochemistry, v. 32 p. 157–168.
Dalai, R. C. and R. J. Mayer, 1986a, Long-term trends in fertility of soils under continuous cultivation and cereal cropping in Southern Queensland. III. Distribution and kinetics of soil organic carbon in particle-size fractions [J]: Aust. J. Soil Res., v. 24, p. 301–309.
Dalal, R. C. and R. J. Mayer, 1986b, Long-term trends in fertility of soils under continuous cultivation and cereal cropping in Southern Queensland, IV. Loss of organic carbon from different density fractions [J]: Aust. J. Soil Res., v. 24, p. 301–309.
Duxbury, J. M., M. S. Smith, and J. W. Doran, 1989, Soil organic matter as a source and a sink of plant nutrients, in D. C. Coleman, J. M. Oades, and G. Uehara, eds., Dynamics of soil organic matter in tropical ecosystems [M]: Honolulu, University of Hawaii Press, p. 33–67.
Gregorich, E. G. and B. H. Ellert, 1993, Light fraction and macro-organic matter in mineral soils, in M. R. Carter, ed., Soil sampling and methods of analysis [M]: Canadian Society of Soil Science, Lewis Publishers, Div. CRC Press, Boca Raton, FL, p. 397–407.
Jenkinson, D. S. and J. H. Rayner, 1977, The turnover of soil organic matter in some of the classical Rothamsted experiments [J]: Journal of Soil Science, v. 123, p. 298–305.
Parton, W. J., P. L. Woomer, and A. Martin, 1994, Modelling soil organic matter dynamics and plant productivity in tropical ecosystems, in P. L. Woomer and M. J. Swift, eds., The biological management of tropical soil fertility [M]: Wiley, Chichester, p. 171–188.
Solomon, D., F. Fritzsche, J. Lehmann et al., 2002, Soil organic matter dynamics in the subhumid agroecosystems of the Ethiopian Highlands: evidence from natural13C abundance and particle-size fractionation [J]: Soil Science Society of America Journal, v. 66, p. 969–978.
Tiessen, H. and J. W. B. Stewart, 1983, Particle size fractions and their use in studies of soil organic matter, II. Cultivation effects on soil organic matter composition in size fractions [J]: Soil Science Society of America Journal, v. 47, p. 509–514.
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This research project was jointly supported by the Foundation of Chinese Academy of Sciences for Innovation (Grant No. KZCX2-105) and the National Natural Science Foundation of China (Grant Nos. 90202003 and 49772175).
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Qiming, L., Shijie, W., Hechun, P. et al. The dynamics of organic matter in soil size and density fractions traced by stable carbon isotopes. Chin. J. Geochem. 22, 179–184 (2003). https://doi.org/10.1007/BF02831528
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DOI: https://doi.org/10.1007/BF02831528