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Soil degradation risk indicator: Organic carbon component

Show simple item record Smith, W. Wall, G. Macdonald, B. Desjardins, R.
dc.coverage.spatial Canada
dc.coverage.spatial Ontario 2018-07-23T14:49:55Z 2018-07-23T14:49:55Z 1997 1997-09-01
dc.description.abstract In order to develop a soil organic carbon.(SOC) indicator for Eastern Canada the Century model was run for all Soil Landscape of Canada (SLC) polygons in the Mixedwood Plains Ecozone of Ontario. Within each polygon, SOC dynamics were estimated for three or four crop rotations and two tillage practices. It was determined that the Mixedwood Plains Ecozone was losing SOC at the rate of -39.6, -34.9, -32.1, and 24.3 kg C ha-1 y-1 for the years 1981, 1986, 1990, and 1991, respectively. Such rates of loss are not measurable on a year to year basis and are usually considered to be at near equilibrium. The introduction of no-till agriculture is the principal factor that reduced the rate of loss of SOC. There was greater loss of SOC near the Southern tip of Ontario where agriculture is most intensive (less hay and pasture). The greatest loss of SOC was found in corn and soybean rotations and there was a gain in SOC under hay and pasture rotations. It was found that soil texture influences SOC dynamics with more SOC being lost in coarser textured soils. The Century model did a reasonable job in estimating SOC dynamics in Ontario. The model was developed and parameterized in the western US grasslands so it was expected to be more sensitive to western Canada SOC dynamics. Considering that the model has been tested successfully worldwide under various climatic, soil, and management practices there is likely no better tool for developing a soil carbon indicator at the present time.
dc.format pdf
dc.language.iso en
dc.publisher Agriculture and Agri-Food Canada
dc.relation.ispartofseries Report No. 22
dc.rights In Copyright - Non-Commercial Use Permitted
dc.subject agriculture en_US
dc.subject agri-environmental indicator en_US
dc.subject soil degradation risk en_US
dc.subject organic carbon en_US
dc.subject soils en_US
dc.subject Century model en_US
dc.title Soil degradation risk indicator: Organic carbon component en
dc.title.alternative Technical report: Pilot study using the Century model to calculate change in soil organic carbon in Ontario soils
dc.type Technical Report
dc.rights.holder Agriculture and Agri-Food Canada
dc.contributor.affiliation Consultant
dc.contributor.affiliation Research Branch, Agriculture and Agri-Food Canada

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