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【目的】研究新疆典型草原灰漠土有机碳总量、腐殖酸种类和腐殖质矿物复合体的不同海拔高度和土壤剖面变化规律。【方法】采用改良的В.В.Пономарёвa和.А.Плотниковa法即重铬酸钾-外加热法进行分组测定。【结果】典型草原灰漠土中土壤有机碳总量变化范围为7.85～10.45 g/kg,其中胡敏酸(HA)含量占有机碳总量4.56%～15.96%,富啡酸(FA)变化范围为7.54%～43.17%,而胡敏素为41.98%～87.90%。腐殖质矿物复合体中以粘土矿物复合体占的比例最大,即胡敏酸紧结合态为1.81%～8.70%,而富啡酸紧结合态复合体含量较低,只占复合体总量0.33%～1.84%。腐殖质矿物复合体随土壤剖面的分布规律:胡敏酸、富啡酸均随土层深度的加深逐渐减少,为7.86%、7.91%、3.96%、19.16%、42.15%和14.90%。【结论】新疆典型草原灰漠土有机碳总量和腐殖质不同组分在海拔高度和土壤剖面中的含量差异都达到显著水平,且腐殖酸类型是在海拔高度高处和剖面上层以胡敏酸-富啡酸型为主,HA/FA<1。
【Objective】 The objective of this study was to study the total organic carbon, the types of humic acids and the variation of humus-to-mineral assemblages at different altitudes and soil profiles in gray desert in typical steppe of Xinjiang. 【Method】 The improved methods of В.В.Пономарёвa and .А.Плотниковa were used, that is, potassium dichromate-external heating method. 【Result】 The results showed that the total SOC content of gray desert soil varied from 7.85 to 10.45 g / kg in typical steppe, with the content of humic acid (HA) accounting for 4.56% -15.96% of total organic carbon and the change of fulvic acid (FA) The range of 7.54% ~ 43.17%, and humin 41.98% ~ 87.90%. The proportion of humic mineral complexes is the largest in the proportion of clay mineral complexes, that is, the tightly bound state of humic acid is 1.81% ~ 8.70%, while the content of tightly bound complex of fulvic acid is low, accounting for only 0.33% ~ 1.84%. Humic acid and fulvic acid decreased gradually with the deepening of soil depth, which were 7.86%, 7.91%, 3.96%, 19.16%, 42.15% and 14.90%, respectively. 【Conclusion】 The content of total organic carbon and humus components in gray desert soil of typical steppe in Xinjiang all reached a significant level in altitude and soil profiles, and the humic acid types were at the altitude above sea level and the top of the profile was Hu Min Acid - fulvic acid type, HA / FA <1.