Quantifying carbon input for targeted soil organic carbon sequestration in China's croplands.

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    • Abstract:
      Background and aims: Increasing the soil organic carbon (SOC) pool in croplands can not only promote crop production but also mitigate climate change. The objective of this work was to quantify the needed C input rates for both maintaining China's cropland SOC and improving it to global average level. Methods: By using a biogeophysical model (Agro-C), we performed simulations with a high spatial resolution (10 × 10 km) across China's croplands to quantify the C input rate under given scenarios. Results: The model simulations showed that an average C input of 2.1 Mg C ha year is required to stop soil C loss and that SOC density could approach the global mean of 55 Mg C ha by 2050 when 5.1 Mg C ha year is incorporated into the soils. Conclusions: The quantified C inputs showed a large spatial disparity, depending on the existing SOC level, mean annual temperature and precipitation. The existing SOC level in Heilongjiang Province, where the cropland area accounts for 9.2 % of the national total, is much higher but the current C input is much lower than it is elsewhere. Increasing the organic C input should be given priority in this province. [ABSTRACT FROM AUTHOR]
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