岩溶槽谷耕地撂荒对垫层/逆坡水土流失阻力的影响

IF 6.1 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2025-04-15 DOI:10.1016/j.still.2025.106577

Lisha Jiang , Xiaohong Tan , Yuanyue Xia , Fengling Gan , Xiuying Xu , Junbing Pu , Youjin Yan , Yuchuan Fan

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引用次数: 0

摘要

土壤抗侵蚀能力是评价土壤侵蚀的重要参数，撂荒和基岩地层倾角通过改变土壤性质和根系性状对土壤抗侵蚀能力产生影响。然而，在具有顺层反坡和独特地质构造的喀斯特槽谷中，撂荒耕地对其抗水土流失能力的影响尚不清楚。因此，为了进一步探讨基岩地层倾角和撂荒对土壤抗侵蚀能力的影响，我们进行了2种类型的农田和撂荒农田、2种基岩地层倾角、3种流量（60、80、100 L·min−1）的冲刷水槽试验。结果表明：退耕后，土壤有机质含量、容重和水稳性团聚体显著增加，且逆坡高于顺坡；顺坡农田和逆坡农田的细沟可蚀性Kr分别是弃耕地的35.45倍和14.88倍。Kr与土壤有机质、容重、水稳性团聚体呈显著负相关。土壤性状对土壤速效钾的影响大于根系性状，表明提高土壤质量是增强土壤抗侵蚀能力的关键。因此，在水土流失严重的地区，应积极应对退耕还草，制定合理的农业生产策略，提高土地利用效率，增强土壤抗侵蚀能力。

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The responses of soil erosion resistance to the farmland abandonment of bedding/inverse slopes in karst trough valley

Soil erosion resistance, a critical parameter for assessing soil erosion, is influenced by farmland abandonment and bedrock strata dips through modifying soil properties and root traits. However, the influence of abandoned farmland on soil erosion resistance in karst trough valleys featuring bedding and inverse slopes as well as unique geological structures remains unclear. Therefore, to further explore the influence of bedrock strata dip and farmland abandonment on soil erosion resistance, we conducted scouring flume experiments involving 2 types of farmlands and abandoned farmlands, 2 bedrock strata dips, and 3 flow discharges (60, 80, and 100 L·min⁻¹). The results indicated that following farmland abandonment, the soil organic matter content, bulk density, and water-stable aggregates significantly increased, and they presented higher values on inverse slope than on bedding slope. The rill erodibility (K_r) of farmland on bedding and inverse slopes were 35.45 times and 14.88 times greater, respectively, than those of abandoned farmland. Moreover, K_r was significantly and negatively correlated with soil organic matter, bulk density, and water-stable aggregates. Furthermore, the impact of soil properties on K_r exceeded that of root traits, suggesting that enhancing soil quality is the key to strengthening soil erosion resistance. Therefore, in regions where soil erosion is severe, there should be an active response to returning farmland to grassland and devising reasonable agricultural production strategies to improve land use efficiency and strengthen soil erosion resistance.

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来源期刊

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.