Below ground carbon inputs to soil via root biomass and rhizodeposition of field-grown maize and wheat at harvest are independent of net primary productivity

Summary

This field study examined the contribution of roots and rhizodeposited carbon to soil carbon stocks in maize and wheat crops at harvest time. The authors found, as suggested by the title, that belowground carbon inputs via root biomass and rhizodeposition were independent of net primary productivity—implying that aboveground yield alone is not a reliable predictor of soil carbon accumulation from these pathways. The findings contribute to understanding soil carbon dynamics in arable cereal systems and may inform carbon accounting in agricultural soils.

UK applicability

The study examines two major UK arable crops (wheat and maize), though conducted in Switzerland with different climatic and soil conditions. The findings on the decoupling of root carbon inputs from aboveground productivity may be relevant to UK cereal production and soil carbon management strategies, though local validation would strengthen applicability.

Key measures

Root biomass, rhizodeposition, belowground carbon inputs, net primary productivity in maize and wheat

Outcomes reported

The study measured belowground carbon inputs via root biomass and rhizodeposition in field-grown maize and wheat at harvest. The authors examined whether these carbon inputs were related to net primary productivity (NPP).

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