黄土高原南部全新世土壤微结构形成机理探讨
Genetic and micromorphological studies of the Holoence soil complex on the southern Loess Plateau
查看参考文献26篇
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文摘
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通过对黄土高原南部不同剖面土壤微结构的研究和与相邻地区的对比，探讨了风化成土过程的特征，揭示出全新世土壤S_0是由上下两个土壤层组成的复合土壤，显示两个较完整的成土过程。早期成土阶段形成了具棕壤特征的古土壤S_0~2，晚期成土阶段形成了淋溶褐土型古土壤S_0~1。土壤S_0以上的部分是风尘堆积增强时期形成的风积黄土层，但被人类耕作活动所扰动。 |
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其他语种文摘
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Detailed soil micromorphological analysis in Holoence loess-palaeosol profile in southern Loess Plateau, along with comparisons with another profile nearby, the thesis discusses the characteristics of weathering and forming processes. It indicates that the micro-texture of the Holoence loess-palaeosol sequence is divided into both cementing texture including type 1, type 2 and type 3, and granular texture including type 4, type 5 and type 6. Cementing texture is always in the palaeosol layers and was formed in warm-humid forest environment. Granular texture is always in typical loess layers or weathering loess layers and was formed in a dry environment. It has been discovered that the palaeosol S_0 is separated into two distinct types of soils, namely palaeosols S_(02) and S_(01), because of the deposition of a layer (L_x) in the aridness. Soil S_0 substantively is a polycyclic soil that is composed of two layers interbedding a loess layer, with two remarkable soil-forming processes. The lower soil S_(02) is brown palaeosol, with the strongest argillification and eluviation, and was formed in early soil-forming phase. Argillic horizons were identified in the soil S_(02). The upper soil S_(01) is leached cinnamon palaeosol, with distinct argillification and weak calcification, and was developed in late soil-forming phase. The polycyclic soil S_0 indicates that pedogenic environment has distinct variations. Cover layer above the polycyclic soil S_0 is not a manured aggradated layer because of continuously piling up of loessial dung. It is a loess layer because of accelerated aeolian dust deposit. The cover is divided into both lower loess L_0 weakly distubed by cultivation activities and upper plough horizon strongly disturbed by cultivation activities. It indicates that it has been a relative arid period after the ending of formation of palaeosol S_0, with clear northwest monsoon domino effect and accelerated aeolian dust deposit. The polycyclic soil S_0 has been buried and become palaeosol of the Holoence. |
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来源
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地理研究
,2002,21(4):487-494 【核心库】
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关键词
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土壤微结构
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全新世
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黄土高原南部
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地址
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陕西师范大学旅游与环境学院, 西安, 710062
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0585 |
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学科
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农业基础科学 |
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基金
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国家自然科学基金
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国家教育部人文社会科学重点研究基地基金
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陕西师范大学重点项目
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文献收藏号
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CSCD:980061
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