新疆典型草原黑钙土腐殖质组分的垂直变化规律

【目的】研究新疆不同海拔高度典型草原黑钙土有机碳总量、腐殖酸种类和腐殖质矿物复合体等土壤剖面变化规律。【方法】采用改良的В.В.Пономарёвa和T.А.Плотниковa法进行分组重铬酸钾-外加热法测定。【结果】新疆典型草原黑钙土有机碳总量变化范围为71.08～44.21 g/kg,胡敏酸(HA)含量变化范围为8.09～44.63 g/kg,而富啡酸(FA)变化范围为10.35～36.72 g/kg。腐殖质矿物复合体以粘土矿物复合体为主,即胡敏酸紧结合态为75.13%～85.14%,而富啡酸紧结合态的是33.92%～38.48%。腐殖质矿物复合体随土壤剖面的分布规律为胡敏酸和富啡酸都是随土层深度的加深而在波动中逐渐减少,即45.54、27.36、19.90、32.71、26.25和13.85 g/kg。【结论】新疆典型草原黑钙土有机碳总量和腐殖质不同组分在不同海拔高度和土壤剖面中的含量差异都达到显著水平,且腐殖酸类型以富啡酸胡敏酸型为主,HA/HF>1。

Study on the Vertical Distribution Regularity of Soil Humus Contents in Typical Grassland Chernozem Soil in Xinjiang,China

【Objective】Our aim was to analyze the total organic carbon,humic acid species and humic substances mineral complexes of different elevations and soil profile changes of the typical grassland chernozem soil.【Method】The improved В.В.Пономарёвa and T.А.Плотниковa method for grouping external heating method for the determination of potassium dichromate was used in this research.【Result】The total organic carbon variation range of typical grassland chernozem soil was between 71.08-44.21 g/kg,brown acid content change was in the range of 8.09-44.63 g/kg,and fulvic acid change was in the range of 10.35-36.72 g/kg.Humus mineral complex was mainly clay mineral complexes,namely brown acid tight binding state of 75.13-85.14%,and fulvic acid tight bound is 33.92%-38.48%.Humus soil mineral complexes with sugar profile distribution law is not only a brown acid but also a fulvic acid.They all decrease with the soil depth decreased gradually,namely 45.54,27.36,19.90,32.71,26.25 and 13.85 g/kg.【Conclusion】The total organic carbon and humus fractions between different elevations and different soil profiles in Xinjiang typical grassland chernozem soil have a significant differences and humic acid fulvic acid type with brown acid type,HA/HF>1.