摘要
本文系统剖析了熊毅—傅积平改进法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／ＬＮａ＿４Ｐ＿２Ｏ＿７混合液连续浸提的松结态（Ｈ＿１）和稳结态（Ｈ＿２）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Ｈ＿１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，Ｈ＿２则与交换性钙呈极显著正相关，而与游离态铁、铝呈极显著负相关，不能被浸提的紧结态腐殖质（Ｈ＿３）与ｐＨ及各种胶结物质均无显著关系。（２）松结态腐殖质（Ｈ＿１）的胡富比低于稳结态腐殖质（Ｈ＿２）的胡富比。前者与游离态铝呈显著正相关，后者则与土壤ｐＨ和交换性钙呈显著正相关。（３）根据溶出物的元素组成，明确松结态主要是铝、铁键结合的腐殖质，但也包含少部分钙键结合的腐殖质。
HA and FA composition and binding characteristics of
soil combined humus di-fferentiated by the modified Hseung’s method were studied.The
results obtainedare summarized as follows:1.It was observed that with the rise of soil pH. there
was a tendency to incr-ease the loosely combined humus(H_1) extracted with 0.1mol/LNaOH
from soil andto decrease the stably combined humus(H_2) extracted sequentially by a
0.1mol/LNaOH + 0.1 mol/L Na_4P_2O_7 mixture from the residues.Statistical analysis
showedthat H_1 was very significantly positively correlated to free Fe and Al but negativelyto
exchangable Ca,and that H_2 was significantly positively correlated to exchangableca but
negatively to free Fe and Al. No significant correlation was found betweentightly combined
humus(H_3) and pH or various binding materials of soil. 2.The ratio of humic acid to fulvic
acid(HA/FA) was lower in H_1 than inH_2. The former was positively correlated with free Al and
the latter positively withpH and exchangable Ca of soil.3.Elemental analysis results of the
extracting solution indicated that H_1 wasactually Al/Fe-combined humus with less
Ca-combined humus,and H_2 was mainlyCa-combined humus.
出处
《土壤学报》
CAS
CSCD
北大核心
1995年第2期151-158,共8页
Acta Pedologica Sinica
