Penggunaan radionuklid 137Cs dalam kajian hakisan tanih jangka panjang
Research on long-term soil erosion was carried out at Little Landside maize field, in Devon, England, using 137Cs fallout as a tracer. Soil sampling programme was undertaken based on transect approach, and soil samples were collected in winter 2004. This study involved measurements of 137Cs conte...
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| Format: | Article |
| Language: | English |
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Journal of Faculty of Social Sciences and Humanities. Universiti Kebangsaan Malaysia
2007
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| Online Access: | http://journalarticle.ukm.my/1535/ http://journalarticle.ukm.my/1535/ http://journalarticle.ukm.my/1535/1/mokhtarjaafar07.pdf |
| Summary: | Research on long-term soil erosion was carried out at Little Landside maize field, in
Devon, England, using 137Cs fallout as a tracer. Soil sampling programme was
undertaken based on transect approach, and soil samples were collected in winter
2004. This study involved measurements of 137Cs contents in soils, and analysis of
soil redistribution. The study used the high-purity germanium (HPGe) detector to
examine the 137Cs contents in soil samples, and the model mass-balance III for the
analysis of soil redistribution. A measurement of the 137Cs content showed that
inventory value was lower by 23.4%, compared to reference inventory value (2427.8
Bq m-2), and this result indicated that soil erosion occurred in the study field. An
analysis of soil redistribution showed that both transects recorded a total erosion
between ca. 92-100 t ha-1 yr-1, and net soil loss rates were calculated at 90-93 t ha-1 yr-
1. The highest total erosion occurred at the top of the slopes (distance between 0-50
m) with an average value of 16.25 t ha-1 yr-1. Gross erosion rates for the study field was 7.2 t ha-1 yr-1, whilst net soil loss was 6.4 t ha-1 yr-1. These results gave a sediment
delivery ratio by 89%. The findings of the study can be concluded thus: soil loss in
the study field could be considered as very high, and sediment mobility occurred and
transported out from the field boundary by surface runoff |
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