Turnover of soil organic matter under pasture as determined by 13C natural abundance [New South Wales]
1990
Skjemstad, J.O. | Prebble, R.E. (Commonwealth Scientific and Industrial Research Organisation, Glen Osmond (Australia). Div. of Soils) | Le Feuvre, R.P. (Commonwealth Scientific and Industrial Research Organisation, Townsville (Australia). Div. of Tropical Crops and Pastures)
Of the 2 grasses studied, Pennisetum clandestinum gave more input of organic matter into the 7.5-15.0 cm horizon than Paspalum dilatatum. In the other horizons (0-7.5 and 60-80 cm) both grasses performed equally. Organic matter within microaggregates contained up to 32 percent more old C than the remaining soil after 83 years. The presence of microaggregates was an important factor in stabilizing organic matter in this soil type. Some difficulties with the technique are discussed.
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