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\begin{document}

\title{Rising carbon uptake and sequestration but declining carbon allocation
to biomass production and grain yield in a high-yield agroecosystem}



\author[1]{Fan Liu}%
\author[1]{Yucui Zhang}%
\author[2]{Xingchang Wang}%
\author[1]{Yongqing Qi}%
\author[1]{Leilei Min}%
\author[3]{Guirui Yu}%
\author[1]{Chunsheng Hu}%
\author[1]{Yanjun Shen}%
\affil[1]{Chinese Academy of Sciences}%
\affil[2]{Northeast Forestry University}%
\affil[3]{Information Management Group for the Synthesis Center of Chinese Ecosystem Research Network (CERN)}%


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  \date{May 27, 2024}


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\begin{abstract}
Photosynthetically carbon (C) allocation largely determines yield and C
sequestration of agroecosystem. However, how C allocation of crops
responses to climate change at the long-time scale is poorly defined.
Combining thirteen years of eddy covariance and inventory measurements,
we comprehensively investigated C allocation mechanism in a winter-wheat
and summer-maize double cropping field. Significantly increased gross
primary production (GPP) was benefited from CO2 fertilization, and 35\%
of increased GPP transferred to strengthening C sequestration. However,
elevated temperature and drying surface soil moisture stimulated the
partitioning of GPP to autotrophic respiration, resulted in conservative
net primary production and grain yield. Maize faced a greater risk of C
loss and yield reduction than wheat to warming and drying. By
synthesizing published long-term data of agroecosystems, we further
highlight that the GPP partitioning cannot be simply predicted by
allometric theory, particularly for grains, which should be considered
in predicting C budget and crop yield.%
\end{abstract}%



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