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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...
The responses of roots to nitrogen- and phosphorus-rich patches of soil include proliferation of laterals and stimulation of nutrient inflow (uptake rate per unit root length) within the patch. Nitrate uptake from an N-rich patch is thereby maximised and, perhaps, compensates for an uneven supply of nitrate to the whole root system. Paradoxically, the often weak correlation between root length density...
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