秦岭北坡垂直带谱土壤腐殖质特性研究

A Study on the Specific Properties of Soil Humus in the Altitudinal Belt of Mountains Qinling Northern Slope

土壤剖面分析得出，秦岭北坡土壤腐殖质丰富，胡敏素和腐殖酸含量相当，富里酸＞胡敏酸。除耕地外，腐殖酸均以活性部分为主，其中胡敏酸的游离度很低，富里酸的则较高。随海拔升高，土壤腐殖质含量增加，胡敏素的比例下降，腐殖酸特别是活性部分明显提高；同一剖面自上而下游离腐殖酸逐渐增多。下层与上层、结合态与游离态、耕地和针叶林与灌丛草甸相比。

There is an abundance of humus in the altitudinal belt of Qinling's northern slope.Humic acid and humin are well matched in content as well.And fulvic acid is more than HA.The majority of humic acid is the free part,among which the free degree of HA is very low,but that of fulvic acid is rather high.While the elevation heightens,the content of soil humus increases and humin decreases;but the humic acid,especially the free part,improves evidently.The free degree of humic acid enhances gradually from above to below in the profile.The aromatization of lower level strata,combined form,plough land and coniferous are more complicated than that of upper-level strata,free form and thicket meadow.