摘要
对黄土高原的灵台剖面“黄土 -古土壤”序列的研究表明 ,黄土与古土壤中游离态铁 (Fed)、活性态铁 (Feo)和有机质含量均与磁化率 (χ)呈极显著的正相关性 (p <0 .0 1)。Fed 对磁化率的显著影响 ,说明了成土作用强度 ,会影响古土壤铁磁性矿物的形成。有机质对磁化率产生的显著影响可能与生物成磁作用有关。另外 ,成土过程中有机质的存在 ,有利于次生磁赤铁矿的形成 ;以及古土壤形成后 ,有机质的存在可妨碍磁赤铁矿的老化 ,使之不易转化为赤铁矿 ,可能也是重要原因。Feo 与磁化率的极显著相关性 ,主要应与Feo和Fed。
The study of the loess paleosol sequence of the Lingtai Section in the Loess Plateau, Northwest China, indicates that free iron (Fe d), active iron ( Fe o) and organic matter contents in the sequence are highly significantly corr elat ed with magnetic susceptibility (χ) (p<0.01). The influence of Fe d on ma gnetic susceptibility indicates that the degree of pedogenesis will affect the formati on of ferromagnetic minerals in the paleosols. The significant correlation betwe en organic matter and magnetic susceptibility may be attributed to the processes of biogenetic magnet. In addition, the contribution of organic matter to the fo rmation of maghemite in the pedogenetic processes and it interfering with the ag eing of maghemite to hematite afterwards are also important reasons. The highly significant correlation between Fe o and magnetic susceptibility is mainly rela te d to the close relationships between Fe o and Fe d, and Fe o and organic matt er.
出处
《土壤学报》
CAS
CSCD
北大核心
2004年第1期7-12,共6页
Acta Pedologica Sinica
基金
国家自然科学基金 (批准号 :4 0 1 0 1 0 1 3)
中国博士后基金
中国科学院地球环境研究所黄土与第四纪地质国家重点实验室基金
