土壤有机矿质复合体研究 Ⅶ．土壤结合态腐殖质的形成特点及其结合特征

本文系统剖析了熊毅－傅积平改进区分的土壤结合态腐殖质的形成特点，胡，富组成及其结合特征。结果表明：（１）用０．１ｍｏｌ／ＬＮａＯＨ及０．１ｍｏｌ／ＬＮａＯＨ＋０．１ｍｏｌ／ＬＮａ４Ｐ２Ｏ７混合液连续浸提的松结态（Ｈ１）和稳结态（Ｈ２）腐殖质所占的比例随土壤ｐＨ升高分别呈减少和增加趋势。统计分析显示Ｈ１与游离态铁，铝呈极显著的正相关，与交换性钙呈极显著负相关，Ｈ２则与交换性钙呈极显著正相关，而与游离

STUDIES ON ORGANO-MINERAL COMPLEXES IN SOIL VII.FORMATION AND BINDING CHARACTERISTICS OF SOIL COMBINED HUMUS

HA and FA composition and binding characteristics of soil combined humus differentiated by the modified Hseung's method were studied. The results obtained are summarized as follows: 1.It was observed that with the rise of soil pH, there was a tendency to increase the loosely combined humus(H₁) extracted with 0.1mol/L NaOH from soil and to decrease the stably combined humus(H₂) extracted sequentially by a 0.1mol/L NaOH-0.1mol/L Na₄P₂O₇ mixture from the residues. Statistical analysis showed that H₁ was very significantly positively correlated to free Fe and Al but negatively to exchangable Ca, and that H₂ was significantly positively correlated to exchangable Ca but negatively to free Fe and Al. No significant correlation was found between tightly combined humus(H₃) and pH or various binding materials of soil. 2. The ratio of humic acid to fulvic acid (HA/FA) was lower in H₁ than in Hz. The former was positively correlated with free A1 and the latter positively with pH and exchangable Ca of soil.3. Elemental analysis results of the extracting solution indicated that H, was actually Al/Fe-combined humus with less Ca-combined humus, and H₂ was mainly Ca-combined humus.