Amino acids and amino sugars as molecular indicators of the origins and alterations of organic matter in buried tephra layers

Hobara, Satoru; Ogawa, Hiroshi; Benner, Ronald

doi:10.1016/j.geoderma.2020.114449

Cited by 5 publications

(2 citation statements)

References 65 publications

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“…The high contribution of plant residues to SOC might be the reason for the strong decline in SOC with increasing years of peanut monoculture. Plant residues are most likely more easily mineralized by soil microorganisms than microbial residues (Hobara et al., 2020; Khan et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

Peanut monoculture‐induced decline in fertility of Andosols in Nicaragua

Castillo

Materna

Jannoura

et al. 2022

J. Plant Nutr. Soil Sci.

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Background: Andosols are generally characterized by strong resilience to degradation and high soil fertility. This may decline during long-term peanut (Arachis hypogea) monoculture, as indicated by soil chemical and biological properties. Aims:The study investigated the monoculture-induced changes in soil chemical environment as driver for the decline in soil fertility. Methods:In this on-farm study, soils from seven sites cropped with peanut monoculture for different periods between 1 and 20 years were analyzed for soil chemical properties (pH, Al and Fe oxides, soil organic matter) as well as soil microbial biomass and microbial functional diversity, estimated by multiple substrate-induced respiration (MSIR).Results: Total nitrogen (N), soil organic carbon (SOC), and microbial biomass C (MBC) declined by 57%, 62%, and 73%, respectively, over 20 years of peanut monoculture in comparison with 1 year peanut cultivation. The SOC/total N ratio showed the most consistent decrease during this period. The Shannon diversity index, calculated from the MSIR responses, generally decreased from 2.5 to 2.1 during peanut monoculture, passing a minimum after 10 years. Discriminant function 1 declined with increasing years of peanut monoculture (r = -0.87) and explained 74% of the variance, separating nearly all peanut sites from each other. The main predictors were soil pH, exchangeable Al 3+ , and the SOC/total N ratio, but dithionite extractable Al and Fe as well the ratio of exchangeable Ca 2+ /Mg 2+ also made significant contributions. Conclusion:Twenty years of peanut monoculture led to a strong decline in soil fertility, as strongly indicated by soil microbiological indices.

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Section: Discussionmentioning

confidence: 99%

Peanut monoculture‐induced decline in fertility of Andosols in Nicaragua

Castillo

Materna

Jannoura

et al. 2022

J. Plant Nutr. Soil Sci.

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“…The distribution of fine roots (<2mm in diameter) in deep soil may be influenced by the existence of buried humic soil. Buried humic soil is often formed by lava flows, volcanic deposits, weathered loess and floods covering surface humic soil (Chaopricha and Marin-Spíotta 2014) and is relatively rich in soil organic matter for deep soil (Hobara et al 2020). Humic volcanic soils possess distinctive properties derived from organic matter, such as high water retention, low bulk density (Takahashi and Dahlgren 2016), and high cation exchange capacity derived from organic matter (Suzuki et al 2005, Kaneko 2015), as compared with other soil types, which can facilitate or accelerate root growth.…”

Section: Introductionmentioning

confidence: 99%