Changes in soil carbon inventories following cultivation of previously untilled soils
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Cultivation of previously untilled soils usually results in release of carbon from the soil to the atmosphere, which can affect both soil fertility locally and the atmospheric burden of CO2 globally. Generalizations about the magnitude of this flux have been hampered by a lack of good quality comparative data on soil carbon stocks of cultivated and uncultivated soils. Using data from several recent studies, we have reexamined the conclusions of previous reviews of this subject. The data were divided into subsets according to whether the soils were sampled by genetic horizon or by fixed depths. Sampling by fixed depths appears to underestimate soil C losses, but both subsets of data support earlier conclusions that between 20% and 40% of the soil C is lost following cultivation. Our best estimate is a loss of about 30% from the entire soil solum. Our analysis also supports the conclusion that most of the loss of soil C occurs within the first few Years (even within two Years in some cases) following initial cultivation. Our analysis does not support an earlier conclusion that the fractional loss of soil carbon is positively correlated to the amount of carbon initially present in the uncultivated soil. We found no relation between carbon content of uncultivated soil and the percentage lost following cultivation.
Key wordscarbon cycle land-use change organic carbon tillage
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- Coote DR & Ramsey JF (1983) Quantification of the effects of over 35 Years of intensive cultivation on four soils. Can. J. Soil Sci. 63: 1–14Google Scholar
- Houghton RA, Boone RD, Fruci JR, Hobbie JE, Melillo JM, Palm CA, Peterson BJ, Shaver GR & Woodwell GM (1987) The flux of carbon from terrestrial ecosystems to the atmosphere in 1980 due to changes in land use: geographic distribution of the global flux. Tellus 39: 122–139Google Scholar
- Kononova MM (1961) Soil Organic Matter its Nature, its Role in Formation and in Soil Fertility. Pergamon Press Inc., NYGoogle Scholar
- Martel YA & Mackenzie AF (1980) Long term effects of cultivation and land use on soil quality in Quebec. Can J. Soil Sci. 60: 411–420Google Scholar
- Nelson DW & Sommers LE (1982) Total carbon, organic carbon, and organic matter. In: Page AL, Miller RH & Keeney DR (Eds) Methodsof Soil Analysis (pp 539–579). American Soc. of Agronomy, WisconsinGoogle Scholar
- Post WM & Mann LK (1990) Changes in soil organic carbon and nitrogen as a result of cultivation. In: Bouwman AF (Eds) Soils and the Greenhouse Effect (pp 401–406). John Wiley & Sons Ltd., EnglandGoogle Scholar
- Rublin YV & Dolotov VA (1967) Effect of cultivation on the amounts and composition of humus in gray forest soils. Sov. Soil Sci. 1967: 733–738Google Scholar
- Schlesinger WH (1986) Changes in soil carbon storage and associated properties with disturbance and recovery. In: Trabalka JR & Reichle DE (Eds) The Changing Carbon Cycle. A Global Analysis (pp 194–220). Springer Verlag, NYGoogle Scholar
- Street J (1982) Changes of carbon inventories in live biomass and detritus as a result of the practice of shifting agriculture and the conversion of forest to pasture: case studies in Pure, New Guinea and Hawaii. In: Ahmad I & Jahi JM (Eds) Geography and the Third World (pp 249–258). Penerbit Universiti, Kebangsaan, MalaysiaGoogle Scholar
- Vorney RP, Van Veen JA & Paul EA (1981) Organic C dynamics in grassland soils. 2. Model validation and simulation of the long-term effects of cultivation and rainfall erosion. Can. J. Soil Sci. 61: 211–224Google Scholar
- Yefimov VN & Lunina NF (1986) Change in the composition of organic matter in peat soils during 70 Years of cultivation. Soviet Soil Sci. 18: 41–49Google Scholar