Irrigation water quality effects on soil carbon fractionation and organic carbon dissolution and leaching in a semiarid calcareous soil.

摘要: Irrigation water quality and soil organic matter content influence crop yields properties such as salinity particle aggregation. We used laboratory column batch studies carbon fractionation to study potential (OC) losses from a Typic Torrifluvent with 0.79% total OC 4.7% inorganic ([IC] carbonates). About 4% of the fraction was determined be water-soluble (SOC). Under saturated flow, significant amount SOC (20%―35%) lost this (Pima clay loam) just two pore volumes irrigation water. Sodium- sulfate-rich waters rainwater were up twice effective at releasing dominated by calcium chloride ions. Not all can attributed well-known dispersive effects sodium rainwater. Soluble also highly correlated progressive dissolution IC fraction. Water has measurable impact on OC-poor carbonate-rich soils. Changes in may increase leaching plow layer favor increased denitrification potentially sequestration below root zone irrigated semiarid