Journal Article

FZJ-2018-02002

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Allocation of photosynthesized carbon in an intensively farmed winter wheat–soil system as revealed by 14CO2 pulse labelling

Sun, Z. ; Chen, Q. ; Han, X. ; Bol, R.FZJ* ; Qu, B. ; Meng, F. (Corresponding author)

2018
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/17721  doi:10.1038/s41598-018-21547-y

Abstract: Understanding the rhizodeposited carbon (C) dynamics of winter wheat (Triticum aestivum L.), is crucial for soil fertility and C sequestration. Pot-grown winter wheat was pulse labelled with 14CO2 at the key growth stages. 14C in the shoots, roots and soil was measured at 5 or 2 days after 14C-labelling (DAL 5/2) at each growth stage and at harvest. The 14C in the shoots increased from 4% of the net 14C recovered (shoots + roots + soil) during tillering to 53% at harvest. Approximately 14–34% of the net 14C recovered was incorporated into the soil. Allocation of photosynthesized C was extrapolated from the pot experiment to field condition, assuming a planting density of 1.8 million plants ha−1. The estimated C input to the soil was 1.7 t C ha−1, and 0.7 t C ha−1 of root residues was retained after wheat harvest; both values were higher than those previously reported (0.6 and 0.4 t C ha−1, respectively). Our findings highlight that C tracing during the entire crop season is necessary to quantify the temporal allocation of photosynthesized C, especially the contribution to soil carbon in intensified farming system.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) (POF3-255)

Appears in the scientific report 2018

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