Abstract
Soil erosion is a global environmental problem. The affecting main factors for soil erosion processes are different due to the specific areas. The calculated results of soil erosion, by Ha Quang Hai and Tran Tuan Tu, demonstrated that Song Be basin is eroded very huge, about 321 tons/ha/year. The article is based on factors proposed by R.P.C Morgan in 2005, using the analytic hierarchy process AHP (Thomas L. Saaty, 1970) to determine the weights for these factors. Since then, the article concluded main factors affecting soil erosion at Song Be basin. Research results showed that the Terrain factor has the largest weight (0.30), followed by two factors: Plant cover (0.29) and Rain (0.28). The article also identified four main factors impacting on the soil erosion at Song Be basin, including: slope, land cover ratio, intensity of rainfall and slope length. These results will be the basis for subsequent studies to adjust USLE model more applicably for erosion characteristics in the researched area.
Highlights
The article is based on factors proposed by R.P.C Morgan in 2005, using the analytic hierarchy process AHP
Research results showed that the Terrain factor has the largest weight (0.30), followed by two factors: Plant cover (0.29) and Rain (0.28)
The article identified four main factors impacting on the soil erosion at Song Be basin, including: slope, land cover ratio, intensity of rainfall and slope length
Summary
Xói mòn ñất là sự mang ñi lớp ñất mặt do nước chảy, tuyết hoặc các tác nhân ñịa chất khác bao gồm cả các quá trình sạt lở do trọng lực (Rattan Lal, 1990). AHP cung cấp cho người ra quyết ñịnh một cách tiếp cận trực quan theo sự phán ñoán thông thường ñể ñánh giá sự quan trọng của mỗi thành phần thông qua quá trình so sánh cặp. Nguồn: [2] Phương pháp AHP ño sự nhất quán qua tỷ số nhất quán (consistency ratio) giá trị của tỷ số nhất quán nên ≤ 10%, nếu lớn hơn, sự nhận ñịnh là hơi ngẫu nhiên, cần ñược thực hiện lại. Bài báo sử dụng hệ thống các yếu tố ảnh hưởng ñến xói mòn ñất theo ñề xuất của R.P.C Morgan năm 2005 [1] kết hợp với tham khảo chuyên gia ñể xác ñịnh các yếu tố có ảnh hưởng trong khu vực nghiên cứu. Cây phân cấp các yếu tố thể hiện như hình 4.1
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