Biochar amendment has been proposed as a promising means to increase carbon (C) sequestration and simultaneously benefit plant productivity. However, quantifying the assimilation and dynamics of photosynthetic C in plant–soil systems under biochar addition remains elusive. This study established two experimental factors involving biochar addition and nitrogen (N) fertilization to quantitatively assess the effect of biochar on photosynthetic C fate in a rice plant–soil system. The rice plants and soil samples were collected and analyzed after 6-h pulse labeling with 13CO2 at the tillering, jointing, heading and ripening stages. Biochar did not affect the proportions of photoassimilated carbon-13 (13C) allocations in plant–soil systems. Nevertheless, biochar enhanced the 13C contents in the shoot, root, and soil pools, especially when combined with N fertilization, and biochar increased the cumulative assimilated 13C contents in the shoot, root, and soil pools by 23%, 14% and 20%, respectively, throughout the whole growth stage. Moreover, biochar addition significantly enhanced the N use efficiency (NUE) by c. 23% at the heading and ripening stages. In summary, biochar increases the content of photoassimilated C in plant–soil systems by improving plant productivity via enhancing NUE, thus resulting in a higher soil C sequestration potential.

Quantitative assessment of the effects of biochar amendment on photosynthetic carbon assimilation and dynamics in a rice–soil system

Drosos M.
Membro del Collaboration Group
;
2021-01-01

Abstract

Biochar amendment has been proposed as a promising means to increase carbon (C) sequestration and simultaneously benefit plant productivity. However, quantifying the assimilation and dynamics of photosynthetic C in plant–soil systems under biochar addition remains elusive. This study established two experimental factors involving biochar addition and nitrogen (N) fertilization to quantitatively assess the effect of biochar on photosynthetic C fate in a rice plant–soil system. The rice plants and soil samples were collected and analyzed after 6-h pulse labeling with 13CO2 at the tillering, jointing, heading and ripening stages. Biochar did not affect the proportions of photoassimilated carbon-13 (13C) allocations in plant–soil systems. Nevertheless, biochar enhanced the 13C contents in the shoot, root, and soil pools, especially when combined with N fertilization, and biochar increased the cumulative assimilated 13C contents in the shoot, root, and soil pools by 23%, 14% and 20%, respectively, throughout the whole growth stage. Moreover, biochar addition significantly enhanced the N use efficiency (NUE) by c. 23% at the heading and ripening stages. In summary, biochar increases the content of photoassimilated C in plant–soil systems by improving plant productivity via enhancing NUE, thus resulting in a higher soil C sequestration potential.
2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/160849
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