Distribution and Assessment of Soil and Land Degradation in Subtropical China—A Case Study of the Dongxi River Basin, Fujian Province *1English Full Text

PU LIJIE 1, BAO HAOSHENG 1, PENG BUZHUO 1 and D. L. HIGGITT 2 1 Department of Geography, Nanjing University, Nanjing 210093 (China) 2 Department of Geography, University of Durham, DH1 3LE (UK) (Received April 22, 1998; revised May 25

Abstract: Some alternative methods for estimating soil erosion rates rapidly were used to elucidate the relationship between the land use types and land degradation. The 137 Cs content, magnetic susceptibility, aggregate stability, and soil properties were studied in the Dongxi River Basin, a mountainous area of western Fujian. A plot of 137 Cs inventory （Y） against slope angle （X） shows a strong inverse log log relationship （ r = -0.83 ）, indicating that much more soil erosion occurs on steeper slopes. Average soil loss （in thickness of top soil per year） in the past 30 years for arable slope crest, arable slopes and tea plantation slopes are 1.6 , 10.4 and 8.0 mm year -1 respectively. The surface layer enrichment factor of magnetic susceptibility （Y） in soil also shows an inverse log log relationship （ r =-0.63）, indicating a similar tendency with the relationship between the 137 Cs inventory （Y） against slope angle （X）. The physical and chemical properties of soils among different land use types show different degraded characteristics at different significant levels.

Keywords：

Cs technique; magnetic susceptibility; soil and land degradation; subtropical environment;

Series：
(D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy
Subject：
Geology; Fundamental Science of Agriculture; Agronomy
Classification Code：
S159.2(57),S157

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Distribution and Assessment of Soil and Land Degradation in Subtropical China—A Case Study of the Dongxi River Basin, Fujian Province *1English Full Text

PU LIJIE 1, BAO HAOSHENG 1, PENG BUZHUO 1 and D. L. HIGGITT 2 1 Department of Geography, Nanjing University, Nanjing 210093 (China) 2 Department of Geography, University of Durham, DH1 3LE (UK) (Received April 22, 1998; revised May 25

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