摘要
在研究的红壤类土壤样品中普遍存在着针铁矿的铝同晶替代作用,供试样品中针铁矿铝替代量为0.14％～27.21％(摩尔百分数),平均为8.77％。红壤亚类、黄红壤亚类和黄壤亚类平均依次为10.32％、9.79％、1.30％,其中红壤、黄红壤亚类与黄壤亚类之间差异明显,这反映了成土条件的差异。土壤中针铁矿的铝替代量与粘粒中铁的游离度正相关,与土壤粉砂粘粒比负相关,说明针铁矿中铝替代量随土壤发育的增加而增加。
This paper dealt with the Al-substitution of goethite in Red Earths, and the relationship between the Al-substitution of goethite and the development of soil. The Al-substitution of goethite in soil increased in the order of the Yel- low Earth subgroup, the Yellow-Red Earth subgroup, and the Red Earth subgr- oup. The differentia of the Al-substitution of goethite between the Yellow Earth and the Red Earth the Yellow-Red Earth were quite significant, but it was insignificant between the Red Earth and the Yellow Red Earth. Positive cor- relation was found in the Al-substitution of goethite to the clay Fe (d)/Fe(t), but it was negatively, correlated to the soil-silt/clay, that meant the Al-substi- tution of goethite in Red Earth increased with the development of soil. So, the content of Al-substitution of goethite in the diagnostic horizon reflected not only the special pedogenic condition of Red Earth, but also the characterized pedo- genic process.
出处
《科技通报》
1991年第6期326-329,共4页
Bulletin of Science and Technology
关键词
针铁矿
铝替代量
红壤
土壤发育
goethite
content of the Al-substitution
Red Earth
development of soil.
