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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Soil degradation associated with water-level fluctuations in the Manwan Reservoir, Lancang River Basin.
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Soil degradation associated with water-level fluctuations in the Manwan Reservoir, Lancang River Basin.

机译：澜沧江流域漫湾水库的土壤退化与水位波动相关。

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摘要

This study was conducted to understand the impacts of dam-induced water-level fluctuations (WLFs) on soil properties. The redundancy analysis (RDA) and two soil degradation indices were used to analyse soil degradation under different land uses and at different soil depths. In addition, the relationships among soil degradation and topographical and geographical parameters were determined. The sampling sites were located in two zones along the Manwan Reservoir, which is a section of the Lancang River in Southwestern China. These zones included a water-level-fluctuation zone (WLFZ) and an infralittoral reference zone (IRZ), which included forestlands, scrublands, and farmlands. The results indicated that WLFs increased soil pH, total phosphorus (TP) concentrations, and total potassium (TK) concentrations, and decreased soil total carbon (TC) and total nitrogen (TN) concentrations. Meanwhile, the WLFs increased the soil C/N ratio, which indicated that the WLFs had a stronger effect on TN than on TC. The degree of soil degradation based on the soil degradation index and the changes in the soil quality index indicated that WLFs significantly affected topsoil quality (0-5 cm), especially in the scrubland, which had the highest degradation level. The results from the RDA indicated that soil degradation significantly increased with decreasing distance along the river upstream of the dam (P<0.05; F=3.05). Our results identified soil degradation in the WLFZ along the Manwan Reservoir. However, further research is needed to determine the mechanisms of degradation in this zone.
机译：进行这项研究是为了了解大坝诱发的水位波动（WLF）对土壤特性的影响。利用冗余分析（RDA）和两个土壤退化指数分析了不同土地利用和不同土壤深度下的土壤退化。此外，还确定了土壤退化与地形和地理参数之间的关系。采样地点位于中国西南澜沧江段漫湾水库的两个区域。这些区域包括水位波动区（WLFZ）和地下基准区（IRZ），其中包括林地，灌丛和农田。结果表明，WLF增加了土壤的pH值，总磷（TP）和总钾（TK）的浓度，并降低了土壤总碳（TC）和总氮（TN）的浓度。同时，WLF增加了土壤碳氮比，这表明WLF对TN的影响大于对TC的影响。基于土壤退化指数和土壤质量指数变化的土壤退化程度表明，WLF显着影响表土质量（0-5 cm），特别是在退化程度最高的灌丛地带。 RDA的结果表明，随着沿大坝上游河道距离的减小，土壤退化显着增加（P <0.05; F = 3.05）。我们的结果确定了沿漫湾水库的WLFZ地区的土壤退化。但是，需要进一步研究以确定该区域的降解机理。

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