Historical soil erosion events in border polje revealed by geochemical fingerprint analysis of soil profiles

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-06-02 DOI:10.1016/j.catena.2025.109202

Chunlai Zhang , Zhongcheng Jiang , Chaosheng Zhang , Zhihua Chen , Ping’an Sun , Tongbin Zhu

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Abstract

Understanding soil erosion history in ecologically fragile karst regions is essential for sustainable land management. The potential use of border polje (BP) soil profiles as reliable records of erosion and deposition remains uncertain. This study investigated the geochemical characteristics of soil profiles developed on limestone and siltstone on both sides of the BP, using geochemical fingerprints to quantify BP soil source proportions and erosion changes. Key findings include (1) the karst and non-karst soil profiles on opposite slopes of BP exhibit distinct geochemical signatures, enabling effective tracing sediment sources. (2) Discriminant analysis and conservative tests effectively distinguished contributions from karst and non-karst slopes, with model goodness-of-fit exceeding 90 % in the BP profiles. (3) Non-karst soils dominate BP soils (>78 % on average), while karst soils contribute significantly to deep layers near karst hills (∼50 %), decreasing to < 10 % in the surface layer. (4) Notable changes in karst and non-karst soil contributions at 1.0–1.4 m depths in the BP soil profile, coupled with the presence of charcoal, suggest shifts in sediment dynamics, highlighting the BP’s sensitivity to erosional environmental changes. These findings validate the feasibility of using BP soil profiles as records of historical erosion, with geochemical fingerprints capturing shifts in sediment contributions from karst and non-karst hills. This study highlights the potential of BP soil profiles as archives of environmental changes, providing a novel framework for reconstructing historical erosion dynamics in karst regions.

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土壤剖面地球化学指纹图谱揭示的边境地区历史土壤侵蚀事件

了解喀斯特生态脆弱区土壤侵蚀历史对土地可持续管理具有重要意义。边界坡面（BP）土壤剖面作为侵蚀和沉积的可靠记录的潜力仍不确定。研究了BP两侧灰岩和粉砂岩土壤剖面的地球化学特征，利用地球化学指纹图谱量化BP土壤源比例和侵蚀变化。主要发现包括：(1)BP相对斜坡的喀斯特和非喀斯特土壤剖面具有明显的地球化学特征，可以有效地追踪沉积物来源。(2)判别分析和保守检验能有效区分岩溶和非岩溶斜坡的贡献，BP剖面的模型拟合优度超过90%。(3)非岩溶土壤在BP土壤中占主导地位（平均占78%），而岩溶土壤在靠近岩溶山丘的深层中占显著地位（约50%），减少至约50%；10%在表层。(4) BP土壤剖面1.0 ~ 1.4 m深度喀斯特和非喀斯特土壤贡献的显著变化，加上木炭的存在，表明BP沉积物动力学的变化，突出了BP对侵蚀环境变化的敏感性。这些发现验证了利用BP土壤剖面作为历史侵蚀记录的可行性，并利用地球化学指纹捕捉喀斯特和非喀斯特山丘沉积物贡献的变化。该研究强调了BP土壤剖面作为环境变化档案的潜力，为重建喀斯特地区历史侵蚀动态提供了新的框架。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.