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| Název: |
典型地表覆盖物对西南丘陵山区梯田边坎 土壤可蚀性的影响. (Chinese) |
| Alternate Title: |
Effects of typical surface cover types on the soil erodibility of terrace risers in the hilly regions of southwestern China. (English) |
| Autoři: |
张胜辉, 朱平宗, 罗伏林, 王定斌, 陈晓燕 |
| Zdroj: |
Acta Prataculturae Sinica; 2025, Vol. 34 Issue 11, p40-52, 13p |
| Témata: |
EROSION, GROUND vegetation cover, CRUST vegetation, SURFACE coatings, TERRACING, LANDFORMS, SOIL degradation |
| Geografický termín: |
CHINA, CHONGQING (China) |
| Abstract (English): |
In the hilly and mountainous areas of southwest China, newly constructed terraced field embankments are highly susceptible to rainfall erosion, which can lead to the formation of eroded gullies and severe soil and water losses. In this study, we investigated the effect of different surface cover types on the soil erodibility of embankments. The study was conducted in a newly developed high-standard farmland area in Shizhu County, Chongqing, and soils from terraced embankments with herbaceous vegetation cover, biological crust cover, and bare land cover (control) were analyzed. The results demonstrated that, compared with soil from bare land embankments, soils from embankments with herbaceous vegetation cover and biocrust cover showed significantly increased saturated hydraulic conductivity, mean weight diameter of aggregates, average number of droplets, and soil cohesion, and significantly lower soil erodibility (K-factor), disintegration rate, maximum disintegration rate, and comprehensive soil erodibility index (CSEI) . The CSEI of soils from embankments with herbaceous vegetation cover and biological crust cover was 57. 7% and 35. 6% lower, respectively, than the CSEI of soil from bare land embankments. The changes in the CSEI of soils from different types of embankments were monitored from midsummer (July) to early winter (November) . The CSEI of soils changed over time, and the pattern of change differed among the three types of embankments. The CSEI of soils from embankments with bare land cover and with herbaceous vegetation cover exhibited a gradually decreasing trend over time. The CSEI of soil from bare land embankments decreased from 0. 82 to 0. 60, and the CSEI of soil from embankments with herbaceous vegetation cover decreased from 0. 45 to 0. 14. In contrast, the CSEI of soil from embankments with biological crust cover first decreased (from 0. 45 in July to 0. 24 in August) and then increased (to 0. 58 in November) . Path analysis indicated that the changes in the CSEI of soil in embankments with herbaceous vegetation cover were mainly driven by soil structural changes due to vegetation growth; the changes in the CSEI of soil in embankments with biological crust cover were closely related to the consolidation effect of the biological crust; and the changes in the CSEI of the soil in bare land embankments were primarily influenced by changes in organic matter content. The results of this study reveal the mechanisms by which different cover types affect the erodibility of soils in terraced embankments, providing scientific technical data and practical guidance for improving the stability of these structures. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
西南丘陵山区新建梯田边坎易受到降水冲刷, 进而形成侵蚀沟, 导致严重的水土流失问题。本研究在重庆市 石柱县新建高标准农田区选取了草本植被覆盖、生物结皮覆盖和裸地 (对照) 梯田边坎, 探究了典型地表覆盖物对梯 田边坎土壤可蚀性的影响。结果表明, 相较于裸地边坎, 草本植被覆盖和生物结皮覆盖显著提高了梯田边坎的土壤 饱和导水率、团聚体平均质量直径、平均水滴数和粘聚力, 显著降低了梯田边坎土壤可蚀性 K 因子、崩解速率、最大 崩解率和土壤可蚀性能综合指数 (CSEI) 。与裸地边坎相比, 草本植被覆盖和生物结皮覆盖边坎的 CSEI 分别降低 了 57. 7% 和 35. 6%, 然而, 不同覆盖类型的梯田边坎在不同生长周期内 CSEI 的变化规律存在差异: 裸地和草本植 被覆盖的 CSEI 呈逐渐减小趋势, 裸地 CSEI 由 0. 82 减小到 0. 60, 草本植被 CSEI 由 0. 45 减小到 0. 14; 而生物结皮覆 盖的 CSEI 则表现为先减小后增大, CSEI 由 7 月的 0. 45 减小到 8 月的 0. 24, 然后增大到 11 月的 0. 58。通径分析表 明, 草本植被覆盖边坎 CSEI 变化主要由植被生长驱动的土壤结构变化引起; 生物结皮覆盖的边坎变化则与生物结 皮的固结作用密切相关; 裸地边坎的变化则主要受有机质含量变化的影响。本研究揭示了梯田边坎不同覆盖类型 对土壤可蚀性的影响机制, 为提升梯田边坎稳定性提供了理论支持和实践依据。 [ABSTRACT FROM AUTHOR] |
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