Landslide-induced changes of soil physicochemical properties in Xitou, Central Taiwan
Landslide-induced changes of soil physicochemical properties in Xitou, Central Taiwan
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DOI：
10.1016/j.geoderma.2015.11.028
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发表时间：
2016-03
期刊：
影响因子：
6.1
通讯作者：
Chih-Hsin Cheng;Sheng-Che Hsiao;Yu-Sheng Huang;Chih-Yu Hung;C. Pai;Chiou-Pin Chen;O. Menyailo
中科院分区：
文献类型：
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作者：
Chih-Hsin Cheng;Sheng-Che Hsiao;Yu-Sheng Huang;Chih-Yu Hung;C. Pai;Chiou-Pin Chen;O. Menyailo
陡峭的山地地形、破碎的地质环境和强烈的降水事件是造成山区滑坡频发的主要因素。山体滑坡对森林生态系统产生巨大影响，显著改变土壤性质；了解这些变化对于促进随后的森林恢复和管理至关重要。本研究以台湾西头湿润山地森林生态系统为研究对象，探讨滑坡对土壤理化性质的影响。我们建立了1976年历史土壤调查数据和2012年同一地点土壤样品数据的数据集，比较了滑坡沉积后土壤性质的差异，并沿着滑坡/非滑坡影响序列进行了土壤采样，以确定滑坡沉积程度对土壤物理化学性质的影响。结果表明：滑坡沉降后，岩石破碎块含量、土壤pH值、容重、无机碳和碱饱和度均增加，且严重滑坡沉降导致的增加幅度更大；滑坡发生后，O层和A层厚度、土壤有机碳、全氮和阳离子交换容量显著降低；随着滑坡沉积程度的增加，这种减少更为明显。然而，交换性钾、钙、镁和有效磷含量不受滑坡沉积的影响。结果表明：滑坡沉降后土壤理化性质发生显著变化；这些结果的变化，特别是在土壤pH值高、结构差、土壤有机碳和全氮低方面的变化，预计将影响森林生态系统的功能。
Steep mountain terrain, fractured geological environments, and intense precipitation events are primary factors that contribute to frequent landslides in mountainous regions. Landslides exert an immense impact on forest ecosystems and substantially change soil properties; understanding these changes is crucial to facilitating subsequent forest revegetation and management. In this study, the effects of landslide on soil physicochemical properties were investigated in a moist montane forest ecosystem in Xitou, Central Taiwan. We established a dataset comprised historical soil survey data obtained in 1976 and data from soil samples taken in 2012 at the same locations to compare differences in soil properties after landslide deposition, and also conducted soil sampling along a landslide/nonlandslide affected sequence to determine how the degree of landslide deposition affected soil physicochemical properties. The results indicated that rock fragment content, soil pH value, bulk density, inorganic carbon, and base saturation increased following landslide deposition and that severe landslide deposition caused more substantial increases. By contrast, the thicknesses of the O and A horizons, soil organic carbon, total nitrogen, and cation-exchange capacity significantly decreased following landslides; these decreases were more substantial with increasing degree of landslide deposition. Exchangeable potassium, calcium, magnesium, and available phosphorus content, however, were unaffected by landslide deposition. The results demonstrated that soil physicochemical properties were significantly altered after landslide deposition; these resultant changes, particularly in regard to high soil pH value, poor structure, and low soil organic carbon and total nitrogen, are expected to influence functions in forest ecosystems.