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本文用Kumada法研究了耕作白浆土各粒径级分中有机质的特征。结果表明，土壤及各粒径级分中有机碳含量多是高肥土壤大于低肥，并随复合体粒径增大而下降，下降的比例是高肥小于低肥；土壤有机质及粘粒含量影响有机碳贮量曲线与各粒径级分含量曲线的关系，高肥土壤中粉粒或细砂级分中的有机碳贮量明显高于低肥。土壤及各粒径级分的腐殖质以能被0.1mol／LNaOH提取的游离态为主，其胡敏酸（HA）含量、PQ1值等多项指标均有高肥大于低肥的趋势，由logk与RF值所决定的HA腐殖化度则是高肥小于低肥。上述规律在粉粒及细砂级分中表现的最为明显。随粒径增大，游离态腐殖质及其HA含量等均有下降趋势，但PQ1则是粉粒中稍高；游离态HA类型随粒径增大而变化的序列为：A型（粘粒）-B型（粉粒）-Rp型（细砂）。0.1mol／LNa4P2O7提取的结合态腐殖质及其HA含量与腐殖化度等均以粉粒中最高，粘粒及细砂中次之，PQ2则随粒径的增大而减小；无论肥力高低，结合态HA大都为腐殖化度较高的A型，少数为B及P型。
In this paper, Kumada method was used to study the characteristics of organic matter in each size fraction of tillage Albic soil. The results showed that the content of organic carbon in soil and each particle size fraction was higher than that in high-fat soil, and decreased with the increase of complex particle size. The proportion of high-fat and low-fat decreased. The contents of soil organic matter and clay The relationship between the organic carbon storage curve and the content of each particle size fraction was affected. The organic carbon storage in the silt or fine sand fractions in the high-fat soil was significantly higher than that in the low-fat soil. Soil and particle size fractions of humus to be 0.1mol / LNaOH free state-based extraction, the humic acid (HA) content, PQ1 values and other indicators of high fat over the low-fat trend by the logk and The HA humification degree determined by the RF value is higher fat than lower fat. The above rules in the powder and fine sand fraction in the most obvious. With the increase of particle size, the content of free humus and its HA decreased, but PQ1 was slightly higher in the powder. The sequence of free HA with the increase of particle size was A (cosmid) -B Type (powder) -Rp type (fine sand). 0.1 mol / L Na4P2O7 extracted bound humus and HA content and degree of humification are the highest powder, clay and fine sand in the second, PQ2 with the particle size increases; regardless of the level of fertility , Most of the bound HA is humic higher A type, a small number of B and P type.