| DOI | 10.1007/s10533-021-00774-y
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| Mechanisms influencing physically sequestered soil carbon in temperate restored grasslands in South Africa and North America |
| Scott D.A.; Bach E.M.; Du Preez C.C.; Six J.; Baer S.G.
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| 发表日期 | 2021
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| ISSN | 1682563
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| 英文摘要 | Sequestering carbon (C) into stable soil pools has potential to mitigate increasing atmospheric carbon dioxide concentrations. Carbon accrues in grassland soil restored from cultivation, but the amount of physically protected C (here measured as microaggregate-within-macroaggregate C) and predominant mechanisms of accrual are not well understood. We modeled the rate of physically protected carbon accrued in three mesic temperate perennial restored grasslands from cross-continental regions using datasets with a wide range of restoration ages from northeast Kansas, USA; southeast Nebraska, USA; and northeast Free State, South Africa. Further, we investigated major controls on the amount of physically protected C in each site using structural equation modeling. Variables in the structural equation model were root biomass, root C:N ratio, soil structure (indicated by bulk density, percent of macroaggregates on a per whole soil mass basis, and percent of microaggregate-within-macroaggregates on a per macroaggregate mass basis), microbial composition (indicated by microbial biomass C, total phospholipid fatty acid [PLFA] biomass, and PLFA biomass of arbuscular mycorrhizae fungi [AMF] biomass), and microaggregate-within-macroaggregate C on a per whole soil mass basis. Across all sites, physically protected C accrued at a rate of 16 ± 5 g m−2 year−1. Data from South Africa fit an a priori metamodel developed for northeast KS that hypothesized physically protected C could be explained as a function of microbial composition, soil structure, root C:N ratio, and root biomass (listed in order of strength of direct effect on physically protected C). In contrast to the model-based hypothesis, root C:N ratio was the strongest influence (negative) on physically protected C in South Africa. The lesser effect of AMF on physically protected C in South Africa was consistent with lower AMF biomass in arid environments. The hypothesized model did not fit southeast Nebraska data possibly due to high (~ 30%) clay content. Overall, these results suggest that physically protected C in soil with moderate amounts of clay (more than 10% and less than 30%) can be predicted with knowledge of roots (biomass and C:N ratio), microbial biomass, and soil aggregation. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG. |
| 英文关键词 | Arbuscular mycorrhizal fungi; Conservation Reserve Program; Microaggregate‐within‐macroaggregate; Microbial biomass; Roots; Soil organic matter; Soil structure |
| 语种 | 英语
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| 来源期刊 | Biogeochemistry
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| 文献类型 | 期刊论文
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| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/184650
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| 作者单位 | Ronin Institute, 127 Haddon Pl, Montclair, NJ, United States; The Nature Conservancy, Nachusa Grasslands, 8772 S Lowden Rd, Franklin Grove, IL 61031, United States; Department of Soil, Crop and Climate Sciences, University of the Free State, Nelson Mandela Dr, Bloemfontein, 9301, South Africa; Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 2, Zurich, 8092, Switzerland; Department of Ecology and Evolutionary Biology, Kansas Biological Survey, University of Kansas, Lawrence, KS, United States
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推荐引用方式
GB/T 7714 |
Scott D.A.,Bach E.M.,Du Preez C.C.,et al. Mechanisms influencing physically sequestered soil carbon in temperate restored grasslands in South Africa and North America[J],2021.
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| APA |
Scott D.A.,Bach E.M.,Du Preez C.C.,Six J.,&Baer S.G..(2021).Mechanisms influencing physically sequestered soil carbon in temperate restored grasslands in South Africa and North America.Biogeochemistry.
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| MLA |
Scott D.A.,et al."Mechanisms influencing physically sequestered soil carbon in temperate restored grasslands in South Africa and North America".Biogeochemistry (2021).
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