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Purpose <p>Dissolved organic matter (DOM) and its bioavailability play a crucial role in soil nutrient fluxes and carbon (C) sequestration. However, limited research has explored the correlation between DOM chemical characteristics and soil organic carbon (SOC) pool dynamics and carbon pool management indices in urban soils.</p> Materials and methods <p>In this study, soil samples were collected from two vegetation types (lawn and tree-lawn combination) across three park age categories (5–10 years, 11–20 years and &gt; 21 years). UV–visible absorption and fluorescence spectroscopy were used to analyze the optical characteristics of soil DOM. The SOC stocks and C pool management indices within the 0–30&#xa0;cm soil profiles of all soils were calculated.</p> Results and discussion <p>Results showed that the content of humus-like substances (C1) and the HIX value increased, while protein-like substances (C2), BIX, FrI, SUVA254, and SUVA260 decreased in soil DOM of tree-lawn combinations with park age. Trends in total organic carbon (OC) storages, dissolved OC storages, recalcitrant OC storages, and C1 showed consistent patterns. Labile OC storage accounted for 49.3%–76.2% of the SOC storages ranging from 13.08 to 21.56 t hm<sup>2</sup>. In old (&gt; 21 years) parks, the SOC storage of tree-lawn combinations (38.24 t hm<sup>2</sup>) was significantly higher than that of lawns (25.12 t hm<sup>2</sup>), predominantly due to the recalcitrant OC storages (20.47 t hm<sup>2</sup>). CPI and Kos increased significantly with park age and were higher in tree-lawn combinations than in lawns, which was due to the increase of C1. The change trend of CPMI was consistent with that of C2 and was lowest in old park, indicating protein-like substances great effects on the level of CPMI. The percent of variance explained of C1 and SR factors for C accumulation and allocation reached highest respectively, suggesting C1 and SR were the main influencing factors affecting SOC pool dynamics. Similarly, the SUVA254, SUVA260, and BIX were the main factors affecting the C pool management index.</p> Conclusions <p>In conclusion, this study demonstrated that vegetation type and park age could modulate SOC pool dynamics and C pool management index by altering the soil DOM fluorescence components.</p>

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Park ages and vegetation types influence soil organic carbon pool dynamics and carbon pool management indices by mediating DOM fluorescence components in urban park soils

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Guanjun Li,
  • Ze Zhang,
  • Zhenke Zhu,
  • Qi Zhao,
  • Xiangxiang Wang,
  • Shuang Wang,
  • Tida Ge,
  • Cuiyan Wu

摘要

Purpose

Dissolved organic matter (DOM) and its bioavailability play a crucial role in soil nutrient fluxes and carbon (C) sequestration. However, limited research has explored the correlation between DOM chemical characteristics and soil organic carbon (SOC) pool dynamics and carbon pool management indices in urban soils.

Materials and methods

In this study, soil samples were collected from two vegetation types (lawn and tree-lawn combination) across three park age categories (5–10 years, 11–20 years and > 21 years). UV–visible absorption and fluorescence spectroscopy were used to analyze the optical characteristics of soil DOM. The SOC stocks and C pool management indices within the 0–30 cm soil profiles of all soils were calculated.

Results and discussion

Results showed that the content of humus-like substances (C1) and the HIX value increased, while protein-like substances (C2), BIX, FrI, SUVA254, and SUVA260 decreased in soil DOM of tree-lawn combinations with park age. Trends in total organic carbon (OC) storages, dissolved OC storages, recalcitrant OC storages, and C1 showed consistent patterns. Labile OC storage accounted for 49.3%–76.2% of the SOC storages ranging from 13.08 to 21.56 t hm2. In old (> 21 years) parks, the SOC storage of tree-lawn combinations (38.24 t hm2) was significantly higher than that of lawns (25.12 t hm2), predominantly due to the recalcitrant OC storages (20.47 t hm2). CPI and Kos increased significantly with park age and were higher in tree-lawn combinations than in lawns, which was due to the increase of C1. The change trend of CPMI was consistent with that of C2 and was lowest in old park, indicating protein-like substances great effects on the level of CPMI. The percent of variance explained of C1 and SR factors for C accumulation and allocation reached highest respectively, suggesting C1 and SR were the main influencing factors affecting SOC pool dynamics. Similarly, the SUVA254, SUVA260, and BIX were the main factors affecting the C pool management index.

Conclusions

In conclusion, this study demonstrated that vegetation type and park age could modulate SOC pool dynamics and C pool management index by altering the soil DOM fluorescence components.