A Novel Method Combining FTIR-ATR Spectroscopy and Stable Isotopes to Investigate the Kinetics of Nitrogen Transformations in Soils

Kira, Oz; Linker, Raphael; Shaviv, A.

doi:10.2136/sssaj2013.08.0358dgs

Cited by 16 publications

(6 citation statements)

References 13 publications

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“…potentially mineralizable N, Schomberg et al 2009) measure net N mineralization rates but not gross ammonification. The development of new, less costly techniques that utilize spectroscopy may accelerate the measurement of gross ammonification (Kira et al 2014). Additionally, the development of reliable indicators of gross ammonification could enable broader investigation of gross N cycling processes (Zaman et al 1999, Luxhøi et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Can mineralization of soil organic nitrogen meet maize nitrogen demand?

et al. 2016

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High-yielding maize-based crop systems require maize to take up large quantities of nitrogen over short periods of time. Nitrogen management in conventional crop systems assumes that soil N mineralization alone cannot meet rapid rates of crop N uptake, and thus large pools of inorganic N, typically supplied as fertilizer, are required to meet crop N demand. Net soil N mineralization data support this assumption; net N mineralization rates are typically lower than maize N uptake rates. However, net N mineralization does not fully capture the flux of N from organic to inorganic forms. Gross ammonification may better represent the absolute flux of inorganic N produced by soil N mineralization. Methods Here we utilize a long-term cropping systems experiment in Iowa, USA to compare the peak rate of N accumulation in maize biomass to the rate of inorganic N production through gross ammonification of soil organic N. Results Peak maize N uptake rates averaged 4.4 kg N ha −1 d −1 , while gross ammonification rates over the 0-80 cm depth averaged 23 kg N ha −1 d −1. Gross ammonification was highly stratified, with 63% occurring in the 0-20 cm depth and 37% in the 20-80 cm depth. Neither peak maize N uptake rate nor gross ammonification rate differed significantly among three cropping systems with varied rotation lengths and fertilizer inputs. Conclusions Gross ammonification rate was 3.4 to 4.5 times greater than peak maize N uptake across the cropping systems, indicating that inorganic N mineralized from soil organic matter may be able to satisfy a large portion of crop N demand, and that explicit consideration of gross N mineralization may contribute to development of strategies that reduce crop reliance on large soil inorganic N pools that are easily lost to the environment.

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Section: Discussionmentioning

confidence: 99%

Can mineralization of soil organic nitrogen meet maize nitrogen demand?

et al. 2016

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“…Spectral‐based analytical technologies have been widely used in soil research because they provide microscale soil information rapidly (Xing et al, 2019). Mid‐infrared‐attenuated total reflectance spectroscopy (ATR) reflects information concerning molecular bonds, such as the modes of molecular functional groups (e.g., stretching/wagging vibration) and clay in minerals and has been used for soil identification as well as nitrate, clay, sand, and soil carbon measurements (Kira, Linker, & Shaviv, 2014; Ma, Du, Zhou, & Shen, 2019). Laser‐induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique.…”

Section: Introductionmentioning

confidence: 99%

LIBS and FTIR–ATR spectroscopy studies of mineral–organic associations in saline soil

Zhang³

et al. 2020

Land Degrad Dev

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Direct characterization of the spatial distribution of elements and compound binding of salt–organic associations in soil is imperative for understanding the mechanisms of organic matter decomposition and nutrient release involved in soil degradation and development processes. However, traditional chemical methods would damage the chemical bonds in salt–organic associations, and modern spectroscopic techniques provide alternative options for resolving this problem. In this study, mid‐infrared‐attenuated total reflectance spectroscopy (FTIR–ATR) was used to obtain molecular group information; laser‐induced breakdown spectroscopy (LIBS) was applied to obtain microlevel distribution of elements, and two‐dimensional correlation spectroscopy (2DCOS) analysis was conducted to illustrate the binding combination features of mineral–organic associations in saline soil from the Hetao Irrigation District in China. The results showed that the distributions of Mg, Ca, Na, and K were heterogeneous at the microlevel; the spatial distributions of Mg and Ca showed a significant correlation (r = 0.90***), while K displayed a negative correlation with the soil organic matter (SOM) contents. In the soil with lower SOM contents, the elements were distributed at the top of the ablation area and enhanced with the increasing SOM content, which reflected the trends of the SOM layer thickness outside the mineral–organic associations at the microlevel. Furthermore, 2DCOS analysis suggested that the hydrogen bonds in silicate groups were stronger than those of organic functional groups, such as C=O/C=C, when combined with salt‐related compounds, and Mg, Ca, Na, and K did not originate from clay mineral compounds in saline soil but partially originated from deposited organic associations.

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“…Mid-infrared attenuated total reflectance spectroscopy (ATR) reflects information concerning molecular bonds, such as the modes of molecular functional groups (e.g. stretching/wagging vibration) and clay in minerals, and has been used for soil identification as well as nitrate, clay, sand, and soil carbon measurements (Kira et al, 2014;Linker et al, 2005;Ma et al, 2019). Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique.…”

Section: Introductionmentioning

confidence: 99%

LIBS and FTIR-ATR spectroscopy studies of mineral-organic associations in salinized soil

Zhang³

et al. 2020

Preprint

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The direct characterization of the spatial distribution of elements and compound binding of salt-organic associations in soil is imperative for understanding the mechanisms of organic matter decomposition and nutrient release in soil degradation and development processes. Modern spectroscopic techniques provide a feasible method for analysis at the microscale. In this study, mid-infrared attenuated total reflectance spectroscopy (FTIR-ATR) was used to obtain molecular functional group information, laser-induced breakdown spectroscopy (LIBS) was apply to obtain micro-level distribution features of elements in soil, and two-dimensional correlation spectroscopy (2DCOS) analysis was conducted to illustrate the binding combination features of mineral-organic associations in salinized from the Hetao Irrigation District in China. The results showed that the distributions of Mg, Ca, Na, and K were heterogeneous at the micro-level; the spatial distributions of Mg and Ca showed a significant correlation (r = 0.90***), while K displayed a negative correlation with the SOM contents. In soil with lower SOM contents, the elements were distributed at the top of the ablation area and enhanced with the increasing SOM content, which reflected the trends of the SOM layer thickness outside the mineral-organic associations at the micro-level. Furthermore, 2DCOS analysis suggested that the hydrogen bonds in silicate groups were stronger than those of organic functional groups, such as C=O/C=C, when combined with salt-related compounds, and Mg, Ca, Na, and K did not originate from clay mineral compounds in salinized soil, but partially originated from deposited organic associations.

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A Novel Method Combining FTIR-ATR Spectroscopy and Stable Isotopes to Investigate the Kinetics of Nitrogen Transformations in Soils

Cited by 16 publications

References 13 publications

Can mineralization of soil organic nitrogen meet maize nitrogen demand?

Can mineralization of soil organic nitrogen meet maize nitrogen demand?

LIBS and FTIR–ATR spectroscopy studies of mineral–organic associations in saline soil

LIBS and FTIR-ATR spectroscopy studies of mineral-organic associations in salinized soil

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