Crops for increasing soil organic carbon stocks–A global meta analysis
Geoderma, 2020•Elsevier
Quantifying the ability of plants to store atmospheric inorganic carbon (C) in their biomass
and ultimately in the soil as organic C for long duration is crucial for climate change
mitigation and soil fertility improvement. While many independent studies have been
performed on the transfer of atmospheric C to soils for single crop types, the objective of this
study was to compare the ability of crops, which are most commonly found worldwide, to
transfer C to soils, and the associated controlling factors. We performed a meta-analysis of …
and ultimately in the soil as organic C for long duration is crucial for climate change
mitigation and soil fertility improvement. While many independent studies have been
performed on the transfer of atmospheric C to soils for single crop types, the objective of this
study was to compare the ability of crops, which are most commonly found worldwide, to
transfer C to soils, and the associated controlling factors. We performed a meta-analysis of …
Abstract
Quantifying the ability of plants to store atmospheric inorganic carbon (C) in their biomass and ultimately in the soil as organic C for long duration is crucial for climate change mitigation and soil fertility improvement. While many independent studies have been performed on the transfer of atmospheric C to soils for single crop types, the objective of this study was to compare the ability of crops, which are most commonly found worldwide, to transfer C to soils, and the associated controlling factors. We performed a meta-analysis of 227 research trials, which had reported C fluxes from plant to soil for different crops. On average, crops assimilated 4.5 Mg C ha−1 yr−1 from the atmosphere with values between 1.7 Mg C ha−1 yr−1, for barley (Hordeum vulgare) and 5.2 Mg C ha−1 yr−1 for maize (Zea mays). Sixty-one percent (61%) of the assimilated C was allocated to shoots, 20% to roots, 7% to soils while 12% was respired back into the atmosphere as autotrophic respiration by plants. Maize and ryegrass (Lolium perenne) had the greatest allocation to the soil (1.0 Mg C ha−1 yr−1 or 19% total assimilation), followed by wheat (Triticum aestivum). 0.8 Mg C ha−1 yr−1, 23%) and rice (Oryza Sativa, 0.7 Mg C ha−1 yr−1, 20%). Carbon allocation to the soil positively correlated to C allocation to roots (r = 0.33, P < 0.05), while correlations between shoot and root biomass on the one hand and C allocation to shoots on the other hand were not significant. The question on the long-term stability of the C transferred to soils remains unanswered.
Elsevier
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