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  • Wiley  (2)
  • Liu, Wei  (2)
  • Zheng, Jufeng  (2)
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  • Wiley  (2)
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  • 1
    Online Resource
    Online Resource
    Greater microbial carbon use efficiency and carbon sequestration in soils: Amendment of biochar versus crop straws
    Wiley ; 2020
    In:  GCB Bioenergy Vol. 12, No. 12 ( 2020-12), p. 1092-1103
    Details
    In: GCB Bioenergy, Wiley, Vol. 12, No. 12 ( 2020-12), p. 1092-1103
    Abstract: While high soil carbon stability had been well known for biochar‐amended soils, how conversion of crop residues into biochar and subsequent biochar amendment (BA) would favor microbial carbon use and carbon sequestration had not been clearly understood. In this study, topsoil samples were collected from an upland soil and a paddy soil, both previously amended with straw and straw‐derived biochar. These samples were incubated with 13 C‐labeled maize residue (LMR) for 140 days to compare carbon mineralization, metabolic quotient ( q CO 2 ), and microbial carbon use efficiency (CUE) under laboratory incubation. 13 C‐phospholipid fatty acid ( 13 C‐PLFA) was used to trace the use of substrate carbon by soil microorganisms. Comparing to straw amendment (SA), BA significantly decreased the native soil organic carbon (SOC) mineralization rates by 19.7%–20.1% and 9.2%–12.0% in the upland and paddy soils, respectively. Meanwhile, total carbon mineralization from the newly added LMR was significantly decreased by 12.9% and 11.1% in the biochar‐amended soils, compared with the straw‐amended soils from the upland and paddy sites, respectively. Furthermore, compared to non‐amended soils, the q CO 2 value was unchanged in straw‐amended soils, but was notably decreased by 15.2%–18.6% and 8.9%–12.5% in biochar‐amended upland and paddy soils, respectively. Microbial CUE was significantly greater in biochar‐amended soils than in straw‐amended soils due to the increasing dominance of fungi in carbon utilization. Compared to SA, BA increased CUE by 23.0% in the upland soil and 21.2% in the paddy soil. This study suggests that BA could outperform SA in the long term to enhance the biological carbon sequestration potential of both upland and paddy soils. This could be due mainly to biochar input as a special substrate to promote microbial community evolution and increase the fungal utilization of carbon substrates, especially for the soil with lower SOC levels.
    Type of Medium: Online Resource
    ISSN: 1757-1693 , 1757-1707
    URL: Issue
    URL: Article
    DOI: 10.1111/gcbb.v12.12
    DOI: 10.1111/gcbb.12763
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2495051-8
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Quantitative assessment of the effects of biochar amendment on photosynthetic carbon assimilation and dynamics in a rice–soil system
    Wiley ; 2021
    In:  New Phytologist Vol. 232, No. 3 ( 2021-11), p. 1250-1258
    Details
    In: New Phytologist, Wiley, Vol. 232, No. 3 ( 2021-11), p. 1250-1258
    Abstract: Biochar amendment has been proposed as a promising means to increase carbon (C) sequestration and simultaneously benefit plant productivity. However, quantifying the assimilation and dynamics of photosynthetic C in plant–soil systems under biochar addition remains elusive. This study established two experimental factors involving biochar addition and nitrogen (N) fertilization to quantitatively assess the effect of biochar on photosynthetic C fate in a rice plant–soil system. The rice plants and soil samples were collected and analyzed after 6‐h pulse labeling with 13 CO 2 at the tillering, jointing, heading and ripening stages. Biochar did not affect the proportions of photoassimilated carbon‐13 ( 13 C) allocations in plant–soil systems. Nevertheless, biochar enhanced the 13 C contents in the shoot, root, and soil pools, especially when combined with N fertilization, and biochar increased the cumulative assimilated 13 C contents in the shoot, root, and soil pools by 23%, 14% and 20%, respectively, throughout the whole growth stage. Moreover, biochar addition significantly enhanced the N use efficiency (NUE) by c. 23% at the heading and ripening stages. In summary, biochar increases the content of photoassimilated C in plant–soil systems by improving plant productivity via enhancing NUE, thus resulting in a higher soil C sequestration potential.
    Type of Medium: Online Resource
    ISSN: 0028-646X , 1469-8137
    URL: Issue
    URL: Article
    DOI: 10.1111/nph.v232.3
    DOI: 10.1111/nph.17651
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 208885-X
    detail.hit.zdb_id: 1472194-6
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