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阿尔泰山西北部垂直带谱中的土壤有机氮素,同土壤腐殖质一样表现为非连续性的特征转化系列。在干旱气候带,土壤的全氮量随海拔升高到黑钙土增加至10倍。土壤中酸不溶态氮相对含量也持续增加,而氨基酸和氨基糖态氮含量下降。胡敏酸中酸不溶态氮和氨基酸态氮也表现出类似的变化趋势。冷一湿气候带中土壤胡敏酸的未鉴定态氮相对含量明显地多于干旱气候带,而干旱气候带中土壤胡敏酸的酸不溶态氮量显著地高于冷—湿气候带。土壤和其胡敏酸中氮素形态分布,与垂直带谱中土壤的腐殖质化过程紧密相关,随腐殖质化度的增加,酸不溶态氮相对含量提高,而氨基酸态氮和氨基糖态氮量下降。胡敏酸中氨基糖态氮含量甚微。
The soil organic nitrogen in the vertical band spectrum in the northwestern Altai Mountains behaved as a series of non-contiguous transformations of the same soil humus. In the arid climatic zone, the total nitrogen content of soil increases up to 10 times with the elevation of the black earth. Soil relative content of acid-insoluble nitrogen also continued to increase, while amino acids and amino sugar nitrogen decreased. Humic acid in acid-insoluble nitrogen and amino acid nitrogen also showed a similar trend. In the cold-wet climate zone, the relative content of unidentified nitrogen in soil humic acid was significantly higher than that in the arid climate zone, while the acid-insoluble nitrogen content of soil humic acid in the arid climate zone was significantly higher than that in the cold-humid climatic zone. The distribution of nitrogen in soil and its humic acid is closely related to the humification process of soil in vertical band spectrum. With the increase of humus, the relative content of acid-insoluble nitrogen increases, while the content of amino acid nitrogen and amino sugar nitrogen decline. Humic acid amino sugar nitrogen content is minimal.