Soil erosion of Southeastern Qinghai-Tibet Plateau based on 137Cs tracer method

doi:10.14088/j.cnki.issn0439-8114.2023.04.008

Abstract

Abstract: The Southeastern Qinghai-Tibet Plateau was selected as the research area, and it was divided into five areas from west to east according to the watershed. 43 surface soil samples were collected to measure ¹³⁷Cs activity, particle size, total organic carbon （TOC） and other data, and the soil erosion status and its influencing factors in this area were analyzed. The results showed that, the specific activity of ¹³⁷Cs of the samples ranged from 0 to 23.75 Bq/kg, with an average value of 10.48 Bq/kg, which was less than the background value of 43.7 Bq/kg, and it revealed that erosion had occurred at all sample points. Slight erosion occurred in all five areas. The erosion modulus of Region III was the largest, and the value was 16.3 t/（hm²·a）. The erosion modulus of Region V was the least, and the value was 7.8 t/（hm²·a）. In the study area, the erosion thickness first increased and then decreased with the increase of the slope, and the erosion thickness was the largest near the slope of 18°. There was no significant correlation between erosion thickness and annual average precipitation, wind speed, and vegetation coverage. There was a significant negative correlation between the erosion thickness and TOC in forest soil , while the negative correlation between the two in meadow soil was not significant.

Key words: soil erosion, ¹³⁷Cs tracer method, affecting factors, Southeastern Qinghai-Tibet Plateau

CLC Number:

S157.1

ZHANG Zhe-yin, YI Peng, CHEN Peng. Soil erosion of Southeastern Qinghai-Tibet Plateau based on ¹³⁷Cs tracer method[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(4): 43-49.

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Soil erosion of Southeastern Qinghai-Tibet Plateau based on ¹³⁷Cs tracer method

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