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Investigating Soil Carbon and Nitrog...

Gautam, Asmita,

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Investigating Soil Carbon and Nitrogen Stocks and Fraction Dynamics with Depth Under Long-Term Tillage and Rotational Cropping System /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigating Soil Carbon and Nitrogen Stocks and Fraction Dynamics with Depth Under Long-Term Tillage and Rotational Cropping System // Asmita Gautam.
Author:	Gautam, Asmita,
Description:	1 electronic resource (103 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-10, Section: B.
Contained By:	Dissertations Abstracts International86-10B.
Subject:	Agriculture. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31968601
ISBN:	9798311954914

Investigating Soil Carbon and Nitrogen Stocks and Fraction Dynamics with Depth Under Long-Term Tillage and Rotational Cropping System /
Gautam, Asmita,

Investigating Soil Carbon and Nitrogen Stocks and Fraction Dynamics with Depth Under Long-Term Tillage and Rotational Cropping System /Asmita Gautam. - 1 electronic resource (103 pages)

Source: Dissertations Abstracts International, Volume: 86-10, Section: B.

Soil organic matter is the largest terrestrial carbon reservoir, playing a crucial role in global carbon cycling and climate change mitigation. Conservation practices such as no-tillage (NT) and crop rotation influence soil organic carbon (SOC) and total nitrogen (TN) storage by influencing soil structure and organic matter stabilization. This study evaluated the long-term effects of tillage and crop rotation on SOC and TN stocks, as well as their distribution within particulate (POM) and mineral-associated organic matter (MAOM) fractions. Soil samples were collected from a long-term tillage experiment established in 1975, using a randomized split-plot design with NT, chisel plow (CP), and moldboard plow (MBP) treatments under three crop rotations: continuous corn (CC), corn-soybean (CB), and continuous soybean (BB). Results indicated that tillage had a stronger influence on SOC and TN stocks than crop rotation across the 1 m soil profile. Specifically, NT increased SOC storage by 15 Mg ha−1and TN by 2.0 Mg ha−1compared to CP and MBP, which showed similar effects. While two-year corn-soybean rotations did not enhance SOC storage relative to monocultures, continuous corn systems contributed more carbon inputs but with lower carbon use efficiency (CUE) due to higher residue C/N ratios, potentially affecting SOC storage. Nitrogen fertilization in continuous corn systems further improved TN storage relative to other rotations. Regarding organic matter fractions, the combined effects of tillage and crop rotation were most pronounced at 0-5 cm depth, especially in POM. At that depth, NT under corn-based rotations stored significantly higher C and N than in the CP and MBP. However, below 5 cm, only tillage effects were observed, with CP and MBP exhibiting increased C and N in POM at their respective plow depths. In contrast, MAOM responded primarily to tillage, with NT consistently showing higher C and N contents across the entire soil profile compared to CP and MBP. These findings highlight the long-term benefits of NT for SOC and TN sequestration, demonstrating that reduced soil disturbance enhances SOC-mineral associations, which are critical for long-term carbon stabilization. Over 46 years, NT management resulted in superior SOC and TN storage compared to conventional tillage, reinforcing its role as a key strategy for improving soil health and mitigating carbon losses in agroecosystems.

English

ISBN: 9798311954914Subjects--Topical Terms:

518588
Agriculture.

Investigating Soil Carbon and Nitrogen Stocks and Fraction Dynamics with Depth Under Long-Term Tillage and Rotational Cropping System /
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520 $a Soil organic matter is the largest terrestrial carbon reservoir, playing a crucial role in global carbon cycling and climate change mitigation. Conservation practices such as no-tillage (NT) and crop rotation influence soil organic carbon (SOC) and total nitrogen (TN) storage by influencing soil structure and organic matter stabilization. This study evaluated the long-term effects of tillage and crop rotation on SOC and TN stocks, as well as their distribution within particulate (POM) and mineral-associated organic matter (MAOM) fractions. Soil samples were collected from a long-term tillage experiment established in 1975, using a randomized split-plot design with NT, chisel plow (CP), and moldboard plow (MBP) treatments under three crop rotations: continuous corn (CC), corn-soybean (CB), and continuous soybean (BB). Results indicated that tillage had a stronger influence on SOC and TN stocks than crop rotation across the 1 m soil profile. Specifically, NT increased SOC storage by 15 Mg ha−1and TN by 2.0 Mg ha−1compared to CP and MBP, which showed similar effects. While two-year corn-soybean rotations did not enhance SOC storage relative to monocultures, continuous corn systems contributed more carbon inputs but with lower carbon use efficiency (CUE) due to higher residue C/N ratios, potentially affecting SOC storage. Nitrogen fertilization in continuous corn systems further improved TN storage relative to other rotations. Regarding organic matter fractions, the combined effects of tillage and crop rotation were most pronounced at 0-5 cm depth, especially in POM. At that depth, NT under corn-based rotations stored significantly higher C and N than in the CP and MBP. However, below 5 cm, only tillage effects were observed, with CP and MBP exhibiting increased C and N in POM at their respective plow depths. In contrast, MAOM responded primarily to tillage, with NT consistently showing higher C and N contents across the entire soil profile compared to CP and MBP. These findings highlight the long-term benefits of NT for SOC and TN sequestration, demonstrating that reduced soil disturbance enhances SOC-mineral associations, which are critical for long-term carbon stabilization. Over 46 years, NT management resulted in superior SOC and TN storage compared to conventional tillage, reinforcing its role as a key strategy for improving soil health and mitigating carbon losses in agroecosystems.
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