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The Effects of Land Use and Landform Transformation on the Vertical Distribution of Soil Nitrogen in Small Catchments

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  • Yunlong Yu

    (Academy of Data Science and Informetrics, Hangzhou Dianzi University, Hangzhou 310018, China
    Chinese Academy of Science and Education Evaluation, Hangzhou Dianzi University, Hangzhou 310018, China
    State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China)

  • Shanshan Wang

    (Academy of Data Science and Informetrics, Hangzhou Dianzi University, Hangzhou 310018, China)

  • Junping Qiu

    (Academy of Data Science and Informetrics, Hangzhou Dianzi University, Hangzhou 310018, China
    Chinese Academy of Science and Education Evaluation, Hangzhou Dianzi University, Hangzhou 310018, China)

Abstract

The diversity of land use and consolidation is fundamental to ensuring sustainable development. However, the impact of diverse land uses and consolidation on the well-known shallow accumulation pattern of soil nitrogen (N) remains unclear. This existence of this knowledge gap severely constrains the sustainable production of newly created farmland. Therefore, the objective of this study was to investigate the effects of land use and gully land transformation on the vertical distribution of soil N in agricultural and nature catchments. Methodologically, soil nitrate (NO 3 − ), ammonium (NH 4 + ) and total nitrogen (TN) were measured to a depth of 100 cm in the hillslope forestland, grassland and gully cropland areas of the treated (gully landform reshaping) and untreated (natural gully) catchments on the Chinese Loess Plateau (CLP). The results indicated that soil N in the hillslope forestland and grassland exhibited a shallow accumulation pattern, while the vertical distribution of soil N in the gully cropland areas displayed a homogeneous, random or deep accumulation pattern. In the hillslope areas, vegetable cover was the dominant factor controlling N variation in the topsoil. In contrast, in the gully areas, the interaction of landform transformation and hydrology was the primary factor influencing the distribution of soil N. In the treated catchment, soil NO 3 − exhibited a significant deep accumulation pattern in the newly created farmland through gully landform reshaping. In the untreated catchment, soil NH 4 + showed a significant deep accumulation pattern in the undisturbed natural gully. This study provides valuable insights into how land use and gully landform transformation affect the soil N profile. This information is crucial for the sustainable development and scientific management of valley agriculture at the catchment scale.

Suggested Citation

  • Yunlong Yu & Shanshan Wang & Junping Qiu, 2024. "The Effects of Land Use and Landform Transformation on the Vertical Distribution of Soil Nitrogen in Small Catchments," Sustainability, MDPI, vol. 16(17), pages 1-14, September.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:17:p:7590-:d:1469513
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    References listed on IDEAS

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