DISTRIBUTION OF 137CS AND ORGANIC CARBON IN PARTICLE SIZE FRACTIONS IN AN ALUMI-HAPLIC ACRISOL OF SOUTHERN CHINA
DISTRIBUTION OF 137CS AND ORGANIC CARBON IN PARTICLE SIZE FRACTIONS IN AN ALUMI-HAPLIC ACRISOL OF SOUTHERN CHINA
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DOI：
10.1097/01.ss.0000128012.07644.a8
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发表时间：
2004-05
期刊：
影响因子：
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通讯作者：
Renying Li;Hao Yang;Xiangyu Tang;Chun-yan Wu;Mingyuan Du
中科院分区：
文献类型：
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作者：
Renying Li;Hao Yang;Xiangyu Tang;Chun-yan Wu;Mingyuan Du
The distributions of 137Cs and organic carbon and their relationships in various particle size fractions of an Alumi-Haplic Acrisol in Southern China were studied. 137Cs was enriched primarily in the clay fraction (<2 μm), indicating that 137Cs was preferentially adsorbed by finer soil particles. Organic carbon content in the clay fraction was no higher than in the very fine silt fraction (2–5 μm) for most soil samples. For different particle size fractions of the Alumi-Haplic Acrisol, the relationship between 137Cs and organic carbon could be described by a power function for the clay fraction (<2 μm) and by a linear function for the other fractions. The significant correlation (r = 0.85, P = 0.05) between 137Cs and organic carbon in the clay fraction (<2 μm) demonstrated that organic carbon contributed to 137Cs sorption in the clay of the soil samples. A particle size correction factor was determined based on the distribution of 137Cs in different particle size fractions. The value of 1.3–1.5 for the particle size correction factor indicated that selective removal of soil particles during soil erosion had an important effect on the accuracy of the estimate of the soil erosion rate for the Alumi-Haplic Acrisol of Southern China Therefore, it is necessary to consider the particle size correction factor in the quantitative models of soil erosion in the Alumi-Haplic Acrisol of Southern China characterized by a high clay content.
