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<p>Land use change (LUC) has been shown to have negative impacts on soil organic carbon (SOC) content and quality. Our primary goal was to investigate the impact of LUC from an anaerobic paddy soil to an aerobic upland sugarcane system on SOC changes. Soil samples from a paddy rice system (PRC) and a 17-year chronosequence of an upland sugarcane (SC) ratoon system (SC6, SC13, SC17) was studied the temporal changes (legacy effect) in the quantity and quality of soil organic carbon (SOC) following land use change (LUC). Physical density fractionation and mid-infrared diffuse reflectance Fourier-transformed spectroscopy (midDRIFTS) were used to assess changes in SOC quantity and quality. LUC from PRC to SC led to increase in SOC at the 0–10&#xa0;cm soil depth (SD) but a decrease in SOC content at depth of 10–100&#xa0;cm. SOC accumulation was evident in SC6 but declined in SC13 and SC17. The conversion from PRC to SC resulted in an increase in the weight, %C, and δ<sup>13</sup>C of the light fraction (LF), but LF weight and %C decreased over time. The particulate organic carbon (POC) content in LF increased after LUC but decreased with increasing time and SD. A transient effect occurs after the conversion from PRC to SC, resulting in changes in the chemical quality of SOC that initially leads to short-term SOC accumulation, followed by a constant decrease over time.</p>

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Impact of Land Use Change From Paddy Rice to Sugarcane Cropping on Quantity and Quality of Soil Organic Carbon

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Neeranuch Phiwdaeng,
  • Wanwipa Kaewpradit,
  • Frank Rasche

摘要

Land use change (LUC) has been shown to have negative impacts on soil organic carbon (SOC) content and quality. Our primary goal was to investigate the impact of LUC from an anaerobic paddy soil to an aerobic upland sugarcane system on SOC changes. Soil samples from a paddy rice system (PRC) and a 17-year chronosequence of an upland sugarcane (SC) ratoon system (SC6, SC13, SC17) was studied the temporal changes (legacy effect) in the quantity and quality of soil organic carbon (SOC) following land use change (LUC). Physical density fractionation and mid-infrared diffuse reflectance Fourier-transformed spectroscopy (midDRIFTS) were used to assess changes in SOC quantity and quality. LUC from PRC to SC led to increase in SOC at the 0–10 cm soil depth (SD) but a decrease in SOC content at depth of 10–100 cm. SOC accumulation was evident in SC6 but declined in SC13 and SC17. The conversion from PRC to SC resulted in an increase in the weight, %C, and δ13C of the light fraction (LF), but LF weight and %C decreased over time. The particulate organic carbon (POC) content in LF increased after LUC but decreased with increasing time and SD. A transient effect occurs after the conversion from PRC to SC, resulting in changes in the chemical quality of SOC that initially leads to short-term SOC accumulation, followed by a constant decrease over time.