Laser diffraction grain-size characteristics of andisols in perhumid Costa Rica: The aggregate size of allophane

被引：27

作者：

Buurman, P

deBoer, K

Pape, T

机构：

[1] Dept. of Soil Science and Geology, Wageningen Agricultural University, 6700 AA Wageningen

来源：

GEODERMA | 1997年 / 78卷 / 1-2期

关键词：

Andisols; allophane; grain-size; laser grain-sizing; aggregate size; Costa Rica; organic matter;

D O I：

10.1016/S0016-7061(97)00012-8

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Grain sizes of eight profiles from a soil catena (630-3160 m) on andesitic ash in perhumid atlantic Costa Rica were investigated by laser diffraction grain-sizing. The samples were (1) shaken with water, (2) treated with peroxide, and (3) treated with peroxide-oxalate. Allophane is absent above 2000 m; it appears around 2000 m and increases downwards. Peroxide treatment and oxalate extraction indicate that the allophane fraction occurs in aggregates of well-defined sizes. The size of the allophane aggregates is between 2 and 20 mu m, and it increases with increasing allophane content. Considerable crystalline clay fraction is only obtained upon oxalate extraction. Repeated oxalate extraction does not remove all allophane in high-allophane profiles. The method further allows the recognition of a large number of ash deposits and of recent ash additions, thus facilitating the recognition of stratified profiles.

引用

页码：71 / 91

页数：21

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