A study of soil formation rates using 10Be in the wet-dry tropics of northern Australia

被引：5

作者：

Lal, R. ^{[1
]}

Fifield, L. K. ^{[1
]}

Tims, S. G. ^{[1
]}

Wasson, R. J. ^{[2
]}

Howe, D. ^{[3
]}

机构：

[1] Australian Natl Univ, Dept Nucl Phys, Canberra, ACT 0200, Australia

[2] Natl Univ Singapore AS2, Dept Geog, Singapore 117570, Singapore

[3] Charles Darwin Univ, Darwin, NT 0810, Australia

来源：

HEAVY ION ACCELERATOR SYMPOSIUM ON FUNDAMENTAL AND APPLIED SCIENCE 2012 | 2012年 / 35卷

关键词：

LOSSES;

D O I：

10.1051/epjconf/20123501001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A catchment level study to obtain soil formation rates using beryllium-10 (Be-10) tracers has been undertaken in the Daly River Basin in the wet-dry tropics of northern Australia. Three soil cores have been collected to bedrock, with depths ranging from similar to 1-3.5 m. Due to agricultural practices, modern soil loss rates can be significantly higher than long-term soil formation rates, but establishing soil formation rates has proved to be a difficult problem. At long-term equilibrium, however, soil formation from the underlying rock is balanced by soil loss from the surface. This long-term rate at which soil is being lost can be determined using the cosmogenic tracer Be-10, created in spallation of atmospheric nitrogen and oxygen by cosmic rays. Since the annual fallout rate of Be-10 is known, the complete Be-10 inventory over the depth of the top soil can be used to establish the soil formation rates.

引用

页数：5

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