نوع مقاله : مقاله پژوهشی
نویسندگان
1 رئیس بخش و عضو تحقیقات حفاظت خاک و آبخیزداری ، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان زنجان
2 دانشگاه تهران
3 دانشیار پژوهشی پژوهشکده حفاظت خاک و آبخیزداری، سازمان تحقیقات، آموزش و ترویج کشاورزی، زنجان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The occurrence and formation of types of erosion in marls is so widespread that it requires special research on the types of marls with erosive forms.This study investigates the physical and chemical properties, forms of erosion and sedimentation intensity of marl units in Zanjan province. To analyze the physical and chemical properties of marl units, sampling of marl materials of marl units in two depths of 0-10 and 0-30 cm was performed on 120 samples. To provide a map of erosion of marl units by combining maps, marl units, altitude map, slope map, direction map and land use together in GIS environment and by removing duplication and processing units, 366 work units were created. Then, using satellite images, aerial photographs and field study and controls along with completing the BLM method score tables, the type and appearance of erosion in each of the work units was determined. The obtained data were analyzed using SAS and SPSS statistical programs.Erosion forms in Zanjan province include: surface, rill, gully, tunnel, bad land, and mass erosion while sheet, rill and stream erosions are dominant. As the results of T-Test, F-Test and Duncan suggest, organic matter per cent (OC), sodium absorbation ratio (SAR), liquidity limit (LL), plasticity index (PI) in both sheet and rill erosion showed a significant difference; therefore these two forms of erosion can be differentiated using these criteria. Determining the physical, mechanical, and chemical characteristics of marls and investigating the relationship between the type of erosion and these characteristics are very effective and practical in determining and adopting effective strategies to curb erosion and sedimentation of marl fields, but they have received less attention in watershed plans. The result has been the implementation of managements and the implementation of operations that have led to the failure of programs and the desired goals have not been achieved.
As the results of T-Test, F-Test and Duncan suggest, organic matter per cent (OC), sodium absorbation ratio (SAR), liquidity limit (LL), plasticity index (PI) in both sheet and rill erosion showed a significant difference; therefore these two forms of erosion can be differentiated using these criteria. Determining the physical, mechanical, and chemical characteristics of marls and investigating the relationship between the type of erosion and these characteristics are very effective and practical in determining and adopting effective strategies to curb erosion and sedimentation of marl fields, but they have received less attention in watershed plans. The result has been the implementation of managements and the implementation of operations that have led to the failure of programs and the desired goals have not been achieved.As the results of T-Test, F-Test and Duncan suggest, organic matter per cent (OC), sodium absorbation ratio (SAR), liquidity limit (LL), plasticity index (PI) in both sheet and rill erosion showed a significant difference; therefore these two forms of erosion can be differentiated using these criteria. Determining the physical, mechanical, and chemical characteristics of marls and investigating the relationship between the type of erosion and these characteristics are very effective and practical in determining and adopting effective strategies to curb erosion and sedimentation of marl fields, but they have received less attention in watershed plans. The result has been the implementation of managements and the implementation of operations that have led to the failure of programs and the desired goals have not been achieved.As the results of T-Test, F-Test and Duncan suggest, organic matter per cent (OC), sodium absorbation ratio (SAR), liquidity limit (LL), plasticity index (PI) in both sheet and rill erosion showed a significant difference; therefore these two forms of erosion can be differentiated using these criteria. Determining the physical, mechanical, and chemical characteristics of marls and investigating the relationship between the type of erosion and these characteristics are very effective and practical in determining and adopting effective strategies to curb erosion and sedimentation of marl fields, but they have received less attention in watershed plans. The result has been the implementation of managements and the implementation of operations that have led to the failure of programs and the desired goals have not been achieved.As the results of T-Test, F-Test and Duncan suggest, organic matter per cent (OC), sodium absorbation ratio (SAR), liquidity limit (LL), plasticity index (PI) in both sheet and rill erosion showed a significant difference; therefore these two forms of erosion can be differentiated using these criteria.
کلیدواژهها [English]
)