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Irrigated agriculture is conducted on approximately 257 million hectares worldwide and continues to expand, particularly in arid to semi-arid regions. Applications of water containing dissolved calcium and bicarbonate ions cause the precipitation of calcium carbonate in the soil and the release of carbon dioxide into the air. However, the contribution of inorganic C to CO2 emissions from the soil...
Background and aims Root-respired δ 13 CO 2 can be useful for exploring plant carbon allocation and root respiratory fractionation as well as for partitioning soil-surface CO 2 emissions into plant root and soil organic matter (SOM) sources, a necessary measure for calculating the contribution of heterotrophic respiration of soil carbon to net ecosystem...
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