Crops for increasing soil organic carbon stocks – A global meta analysis

被引：0

作者：

Mathew, Isack ^{[1
]}

Shimelis, Hussein ^{[1
]}

Mutema, Macdex ^{[2
]}

Minasny, Budiman ^{[3
]}

Chaplot, Vincent ^{[1
,4
]}

机构：

[1] University of KwaZulu-Natal, School of Agricultural, Earth and Environmental Sciences, Private Bag X01, Scottsville,Pietermaritzburg,3209, South Africa

[2] Agricultural Research Council-Institute of Agricultural Engineering, Private Bag X529, Silverton,Pretoria, South Africa

[3] Sydney Institute of Agriculture, School of Life and Environmental Sciences, The University of Sydney, Camperdown,NSW,2006, Australia

[4] Laboratoire d'Océanographie et du Climat: Expérimentations et approches numériques (LOCEAN), UMR 7159, IRD/C NRS/UPMC/MNHN, IPSL, 4, place Jussieu, Paris,75252, France

来源：

Geoderma | 2021年 / 367卷

关键词：

Crops - Climate change - Grain (agricultural product) - Organic carbon - Plants (botany);

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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 © 2020

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