Soil and water loss and ecological risk assessment in southeastern Tibet of southwestern China

Zhou Yuxin; Jiang Qunou; Liu Lanhua; He Caisong; Zhou Yang; Kassandro Mar

doi:10.12171/j.1000-1522.20220404

Journal of Beijing Forestry University > 2023 > 45(7): 88-98. > DOI: 10.12171/j.1000-1522.20220404

Zhou Yuxin, Jiang Qunou, Liu Lanhua, He Caisong, Zhou Yang, Kassandro Mar. Soil and water loss and ecological risk assessment in southeastern Tibet of southwestern China[J]. Journal of Beijing Forestry University, 2023, 45(7): 88-98. DOI: 10.12171/j.1000-1522.20220404

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Soil and water loss and ecological risk assessment in southeastern Tibet of southwestern China

Zhou Yuxin^{1, 2, 3,},
Jiang Qunou^1, ,,
Liu Lanhua⁴,
He Caisong⁴,
Zhou Yang⁴,
Kassandro Mar⁵

1.
Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
2.
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Energy Saving and Environmental Protection and Occupational Safety and Health Research Institute, China Academy of Railway Sciences, Beijing 100081, China
5.
Soil and Water Conservation Bureau of Tibet Autonomous Region, Lhasa 850000, Tibet, China

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Received Date: October 06, 2022
Revised Date: June 25, 2023
Available Online: July 02, 2023
Published Date: July 24, 2023

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Abstract

Abstract

Objective This paper aims to analyze the spatial and temporal characteristics of soil and water loss in southeast area of Tibet of southwestern China, and to conduct a comprehensive assessment of soil and water loss ecological risk, with a view to providing a theoretical basis and scientific guidance for the prevention and control of soil and water loss in southeast area of Tibet.
Method The USLE model was used to estimate the soil erosion modulus and erosion sensitivity index for year 2014, 2017 and 2020 in the study area; then a comprehensive assessment of the ecological risk of soil erosion in southeast area of Tibet was conducted based on precipitation, soil, vegetation cover, sensitivity index and other indicators.
Result (1) The overall soil erosion in southeast area of Tibet was relatively low, and the soil erosion grades were mainly composed of very slight erosion and light erosion, which accounted for about 95% of the study area, the very slight erosion area showed the trend of developing into the light erosion area gradually. (2) From 2014 to 2020, the highest value of the sensitivity index of regional soil and water loss fluctuated around 3.0, which increased in 2017 and decreased slightly in 2020, with little change in the overall value. The high value areas were mainly distributed in the Alpine ice-snow covered areas, the low value areas were mainly distributed in the high vegetation coverage areas. (3) The ecological risk index of soil and water loss in southeast area of Tibet ranged from 1.2 to 4.2. The high risk area was mainly distributed in the subtropical rainforest area in the southwest of the study area, and the low risk area was mainly distributed in the northeast plateau meadow area. The risk grade of soil and water loss fluctuated on the whole, but it should be noted that the proportion of high risk area increased gradually.
Conclusion The soil and water loss in southeast area of Tibet is at a low level, and the effect of soil and water conservation in southwest and northeast area of Tibet is good. However, the ecological risk index of soil and water loss in southwest of the research area is at a high level, therefore, these areas still need to do a good job of soil and water conservation protection, to ensure the safety of regional ecological environment. The effect of soil and water conservation in the northwest to southeast region of the study area is relatively poor, so it is necessary to strengthen the control of soil and water loss, such as carrying out vegetation restoration or taking engineering measures.
- soil and water loss,
- USLE model,
- ecological risk assessment,
- southeastern area of Tibet

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References (26)

References

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Soil and water loss and ecological risk assessment in southeastern Tibet of southwestern China