Genetic link between Mississippi Valley-Type (MVT) Zn-Pb mineralization and hydrocarbon accumulation in the Nanmushu, northern margin of Sichuan Basin, SW China

Intensively managed grasslands are occasionally chemically killed with herbicide and ploughed in order to grow an arable crop. After this management, large N mineralization rates with large losses to the environment are commonly observed. However, it remains to be determined to what extent the chemical killing contribute to increased N mineralization. In this study the potential nitrogen (N) mineralization from grasslands, that were killed with herbicides but otherwise undisturbed, was investigated in a laboratory experiment with undisturbed soil columns. Subsequently we assessed the predictive value of several laboratory indices for N mineralization after chemically killing of the grass. Mineralization rates varied from 0.5 to 3.0 g N m−2 wk−1. The contents of total N, total C, dissolved organic carbon (DOC) and hot-KCl extractable NH 4 + were best related to N mineralization rates (R2 = 50, 48, 38 and 47%, respectively). In combination with information on the N content of the roots and stubble and the age of grassland at destruction, up to 62% of the variation in N mineralization rates could be explained. Although previous studies suggested that dissolved organic nitrogen (DON) is a good indicator for mineralization rates, this was not the case after chemically killing grass in the current study.

Nitrogen Cycle

Arable land

10.1007/s11104-009-0240-6

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Mineralization of Calcon by UV/oxidant systems and assessment of biotoxicity of the treated solutions by E. coli colony forming unit assay

Chemical Engineering Journal (2011)

Mihir Kumar Sahoo B. Sinha M. Marbaniang D.B. Naik R. N. Sharan

Degradation

10.1016/j.cej.2011.11.063

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Citations (28)