城市化和不同水位高程对三峡库区消落带土壤氮磷的影响

邹翠; 王尘辰; 赵洋; 刘语盈; 赵小军; 朱广宇

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (7) : 3832-3842.

土壤污染与控制

城市化和不同水位高程对三峡库区消落带土壤氮磷的影响

邹翠¹, 王尘辰², 赵洋¹, 刘语盈¹, 赵小军¹, 朱广宇¹

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Effects of urbanization and water level elevation on soil nitrogen and phosphorus in the hydro-fluctuation zone of the Three Gorges Reservoir area.

ZOU Cui¹, WANG Chen-chen², ZHAO Yang¹, LIU Yu-ying¹, ZHAO Xiao-jun¹, ZHU Guang-yu¹

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文章历史 +

摘要

以重庆大都市区不同城市化区域和水位高程的消落带土壤为研究对象,通过团聚体湿筛、选择性提取、回归分析、结构方程模型构建等技术方法,探讨城市化和水位高程下铁锰矿物和团聚体组成及稳定性对消落带氮磷的影响.结果表明,不同形态铁、锰含量在不同城市化和水位高程上均无显著性差异,消落带土壤主要以游离态氧化铁和无定形态氧化锰为主;团聚体组成及稳定性在不同城市化和水位高程上有显著差异,大团聚体(＞2mm)和团聚体稳定性随水位高程增加而增加,粉黏粒(＜0.053mm)反之,在165m的海拔上,区县大团聚体含量和团聚体稳定性显著高于主城;TN、TP在不同城市化区域具有显著差异,表现为主城高于区县,且主城的TN、AN、AP随团聚体稳定性增加而增加,区县TP随团聚体稳定性增加而降低,TN、TP、AN和AP的含量分别为(756.33±198.27) mg/kg,(399.97±108.25) mg/kg,(27.84±15.58) mg/kg和(15.03±11.15) mg/kg;结构方程表明,土壤pH值主要通过影响铁锰矿物形态和团聚体稳定性调控消落带氮磷释放.总体而言,主城的氮磷污染风险比区县大,但在水位高程上均无显著差异,土壤团聚体稳定和铁、锰氧化物能有效固定氮磷,减少水环境的污染风险.

Abstract

This study analyzed the soils from riparian zones with different water level elevations in the Chongqing metropolitan area. The effects of soil Fe/Mn minerals and aggregate composition/stability on nitrogen and phosphorus under different urbanization levels and water level elevations were investigated by methods including wet sieving of aggregates, selective extraction, regression analysis and structural equation modeling. The results showed that no significant differences in iron and manganese speciation across urbanization or water level elevation gradients, with the riparian soils mainly composed of free iron oxide and amorphous manganese oxide. The composition and stability of soil aggregates exhibited significant differences across different urbanization and water level elevation gradients. The ＞2mm aggregates and aggregate stability increased with increasing water level elevation, while the ＜0.053mm aggregates exhibited an inverse relationship. At 165m water level elevation, county areas exhibited higher proportions of the ＞2mm aggregates and greater aggregate stability compared to the metropolitan core. TN and TP were significantly varied in different urbanized areas, with higher levels observed in the metropolitan core compared to county areas. TN, AN and AP increased with the increase of aggregate stability in the metropolitan core, whereas TP decreased with the increase of aggregate stability in the county areas. The content of TN, TP, AN and AP were (756.33±198.27) mg/kg, (399.97±108.25) mg/kg, (27.84±15.58) mg/kg and (15.03±11.15) mg/kg, respectively. The structural equation modeling results showed that soil pH regulated nitrogen and phosphorus dynamics in the riparian zone mainly by influencing the speciation of Fe, Mn minerals and the stability of the aggregates. In conclusion, the risks of nitrogen and phosphorus pollution in the metropolitan core are higher than that in the county areas, whereas water level elevation exhibited no significant impact on the pollution across the study area. Stabilized soil aggregates and Fe, Mn oxides can effectively immobilize nitrogen and phosphorus, thereby mitigating water pollution risks.

导出引用

邹翠, 王尘辰, 赵洋, 刘语盈, 赵小军, 朱广宇. 城市化和不同水位高程对三峡库区消落带土壤氮磷的影响[J]. 中国环境科学. 2025, 45(7): 3832-3842

ZOU Cui, WANG Chen-chen, ZHAO Yang, LIU Yu-ying, ZHAO Xiao-jun, ZHU Guang-yu. Effects of urbanization and water level elevation on soil nitrogen and phosphorus in the hydro-fluctuation zone of the Three Gorges Reservoir area.[J]. China Environmental Science. 2025, 45(7): 3832-3842

中图分类号： X53

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