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[目的]对黄土高原安塞县纸坊沟流域退耕林土壤1m剖面有机碳含量、粒度、全氮含量、碳氮比、碳酸钙含量进行分析,研究以粒度反映下的土壤异常层理化性质变化,以及各土壤物理化学的响应。[方法]对黄土高原上3个样地各随机选择3个10m×10m的样方并分坡上、坡中、坡下分别挖掘3剖面,间隔10cm采样,地表0～10cm分0～5和5～10cm2部分分别采样。每剖面采样11个,共99个样品,对其进行机碳含量、粒度、全氮含量、碳氮比、碳酸钙含量分析。[结果]3个样地土壤剖面存在a1、b1、b2、c1、c25个特征层,<0.02mm粒径的土壤颗粒含量减少,>0.02mm粒径的土壤颗粒含量增加,有机碳含量和C/N值(a1、b1、b2、c2)增加,但CaCO3含量上升趋势不明显。[结论]研究证明土壤特征层在黄土地区,尤其是侵蚀性黄土地区是普遍存在的,在现代土壤学和生态学研究领域应当给予重视。
[Objective] The research aimed to analyze the organic carbon content, grain size, total nitrogen content, C / N ratio and calcium carbonate content in 1m section of abandoned cropland in the Zhifanggou Valley of Ansai County of the Loess Plateau. The changes of physical and chemical properties , As well as the physicochemical response of each soil. [Method] Three sampling plots of 10m × 10m were randomly selected from three plots on the Loess Plateau. Three plots were excavated at intervals of 10cm, 0 ~ 5cm and 0 ~ 10cm on the surface 5 ~ 10cm2 part of the sample. Eleven samples were collected for each section. A total of 99 samples were collected and analyzed for carbon content, particle size, total nitrogen content, C / N ratio, and calcium carbonate content. [Result] There were 25 characteristic layers of a1, b1, b2, c1 and c25 in the soil profiles of the three plots. The content of soil particles with the diameter of <0.02mm decreased, the content of soil particles with the diameter of> 0.02mm increased, / N values (a1, b1, b2, c2) increase, but the trend of CaCO3 content is not obvious. [Conclusion] The study proves that the soil characteristic layer is ubiquitous in the loess area, especially the erosive loess area, and should pay attention to in the field of modern soil science and ecology.