[1]Comparison of Key Indicators and Evaluation Models of Soil and Water Loss Sensitivity in Karst Ecosystem[J].Research of Soil and Water Conservation,2021,28(02):256-266.
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Comparison of Key Indicators and Evaluation Models of Soil and Water Loss Sensitivity in Karst Ecosystem
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 02
Page number:
256-266
Column:
Public date:
2021-02-06
- Title:
- Comparison of Key Indicators and Evaluation Models of Soil and Water Loss Sensitivity in Karst Ecosystem
- Keywords:
- karst ecosystem; evaluation of soil and water loss sensitivity; key indicators; spatial principal component analysis; 3S technology
- CLC:
- S157
- DOI:
- -
- Abstract:
- In order to evaluate the sensitivity of soil and water loss in karst more reasonably, the soil loss model of karst ecosystem was established based on the modified RUSLE model, into which karst rocky desertification correction factor was introduced. Based on the ratio of soil erosion amount to soil erosion area under different levels of intensity, the assessment model of impact of key factors of soil and water loss in karst ecosystem was established, and the key indicators of soil and water loss sensitivity in karst ecosystem in Guangxi were analyzed. With the support of 3S technology, an assessment indicator system of soil and water loss sensitivity in karst ecosystem in Guangxi was established. Spatial superposition analysis method, analytic hierarchy process and spatial principal component analysis method were used to establish the assessment models of soil and water loss sensitivity in karst ecosystem in Guangxi. The remote sensing monitoring data of soil and water loss were used to verify and compare the evaluation models, and the optimal model was chosen to analyze the spatial differentiation characteristics of soil and water loss sensitivity in karst ecosystem in Guangxi. The results show that the key indicators of soil and water loss sensitivity in karst ecosystem in Guangxi follow the order meteorology>rocky desertification>vegetation>soil>topography>human activities; the PCAEI model is the best, followed by the AHPEI model and the CMSEI model comes to the next. From the grade of sensitivity, the sensitive areas to soil and water loss were mainly mild, moderate and highly sensitive areas. On the whole, the risk of soil and water loss sensitivity in karst ecosystem in Guangxi was severe. From the perspective of spatial distribution, the intensity of soil and water loss sensitivity gradually increased from the east to the west and from the south to the north in the karst areas, and sensitive areas mainly distributed in Hechi City and Baise City, while insensitive areas mainly distributed in Guilin City and Chongzuo City.
- References:
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Last Update:
2021-02-10