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<p>Elucidating the effects of agricultural utilization on soil nutrient levels and their stoichiometry is important for proposing sustainable agricultural management practices in the northeastern Qinghai-Xizang Plateau. In total, 204 and 405 soil samples were collected from different agricultural land uses at three soil depths (0–10&#xa0;cm, 10–20&#xa0;cm, and 20–40&#xa0;cm) in two climatically distinct regions on the northeastern Qinghai-Xizang Plateau: the Qaidam Basin and the Hehuang Valley. The differences in soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) contents and their stoichiometric ratios among land types and soil depths were investigated, and the main environmental factors were identified. The results show that: SOC, TN, and TP contents under all agricultural land-use types decreased with soil depth in both regions, with a pronounced decline in the deepest layer. In the Qaidam Basin, TP contents under all agricultural land-use types were significantly higher than those in grassland across all soil layers, whereas in the Hehuang Valley, only irrigated land and facility land showed significantly higher TP contents than grassland in all three layers. The C: N, C: P and N: P ratios converged across horizons in different agricultural land soils of both regions. In the Qaidam Basin, SOC, TN, TP, and their stoichiometry in the surface layer (0–10&#xa0;cm) were mainly regulated by geoclimatic factors and soil pH, while no significant drivers were detected in the deeper layer (20–40&#xa0;cm). In contrast, in the Hehuang Valley, BD and soil texture significantly influenced all three depths, with their effects strengthening with depth. These findings suggest that nutrient management strategies should consider depth-specific and region-specific controlling factors to optimize nutrient use efficiency and sustain soil fertility.</p>

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Stoichiometric changes in soil C, N, and P under agricultural land use on the northeastern Qinghai-Xizang plateau

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Bicheng Zhang,
  • Pan Wang,
  • Chenglong Feng,
  • Xiaoqian Deng,
  • Tianzhong Jia,
  • Shaoshan An

摘要

Elucidating the effects of agricultural utilization on soil nutrient levels and their stoichiometry is important for proposing sustainable agricultural management practices in the northeastern Qinghai-Xizang Plateau. In total, 204 and 405 soil samples were collected from different agricultural land uses at three soil depths (0–10 cm, 10–20 cm, and 20–40 cm) in two climatically distinct regions on the northeastern Qinghai-Xizang Plateau: the Qaidam Basin and the Hehuang Valley. The differences in soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) contents and their stoichiometric ratios among land types and soil depths were investigated, and the main environmental factors were identified. The results show that: SOC, TN, and TP contents under all agricultural land-use types decreased with soil depth in both regions, with a pronounced decline in the deepest layer. In the Qaidam Basin, TP contents under all agricultural land-use types were significantly higher than those in grassland across all soil layers, whereas in the Hehuang Valley, only irrigated land and facility land showed significantly higher TP contents than grassland in all three layers. The C: N, C: P and N: P ratios converged across horizons in different agricultural land soils of both regions. In the Qaidam Basin, SOC, TN, TP, and their stoichiometry in the surface layer (0–10 cm) were mainly regulated by geoclimatic factors and soil pH, while no significant drivers were detected in the deeper layer (20–40 cm). In contrast, in the Hehuang Valley, BD and soil texture significantly influenced all three depths, with their effects strengthening with depth. These findings suggest that nutrient management strategies should consider depth-specific and region-specific controlling factors to optimize nutrient use efficiency and sustain soil fertility.