Gully distribution monitoring based remote sensing and key driving factors in the catchment scale of Mollisol region
To understand the key driving factors of the gully distribution and development in typical catchment of Mollisol region, visual interpretation, spatial analysis, detailed geomorphological field survey and statistical analysis were used to quantify the catchment properties(12 variables) and influenci...
Guardado en:
| Autores principales: | , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | ZH |
| Publicado: |
Agro-Environmental Protection Institute, Ministry of Agriculture
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/dc525024b50049fba67dc9e13395cc41 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | To understand the key driving factors of the gully distribution and development in typical catchment of Mollisol region, visual interpretation, spatial analysis, detailed geomorphological field survey and statistical analysis were used to quantify the catchment properties(12 variables) and influencing factors(6 variables) of gully erosion in typical catchment of Mollisol region based on the satellite image and topographic map. The results showed that the forest area in catchment scale could not effectively control the gully development, and the active gully length in the forestland accounted for 46.2% of the total active gully length. The convergent slope of sub-catchment was a typical landform for gully development, and the gully length accounted for 68.1% of the total gully length. The gully length caused by concentrated surface runoff in convergent slope accounted for 63.0% of the total gully length. The catchment area and slope length were the most important factors affecting the gully length, while catchment slope was a significant factor to gully density. Meanwhile, gully erosion was highly associated with the field tractor road in this study region, and the gully length related tractor road accounted for about 23.3% of the total gully length. Our study highlights that the gully development is closely related to enhanced surface runoff caused by the field tractor road. Therfore, comprehensive soil and water management considering landscapes and agricultural tractor roads in the catchment scale should be the priority issue in gully prevention in Mollisol region of northeast China. |
|---|