نوع مقاله : مقاله پژوهشی
1 عضو هیت علمی پژوهشکده حفاظت خاک و آبخیزداری
2 3دانشیار مرکز تحقیقات و آموزش منابع طبیعی و کشاورزی استان فارس
3 استادیار گروه علوم و مهندسی خاک دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان
4 استادیار گروه مهندسی آب دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان
5 5استادیار گروه زراعت و اصلاح نباتات دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان
عنوان مقاله [English]
Gully erosion is a destructive form of water erosion. The purpose of this study was determining the most effective variables on the gully volume and length in the Jahan Abad, Buin zahra (Qazvin province). 33 gullies were recorded and their length, width and depth were measured. Surface soil samples were taken from headcut and analyzed. Indices related to the form of watershed were extracted from the digital elevation model which derived from UAV image processing. Correlation between factors, PCA and multivariate regression were performed to determine important and effective factors on gullies volume and length in MINITAB. PCA showed that the first and second components are close to 41%. Chlorine, electrical conductivity and sodium with negative effect and aggregate stability, canopy and amount of sand with positive charge in the first component have the most weight, while in the second component, sand, canopy and amount of gravel with positive effect and TNV, organic matter and saturation percentage play a more important role. The results of multivariate regression also showed that carbonate, magnesium, potassium, organic matter, saturation percentage, amount of sand, slope of gully floor, slope of inlet waterway to headcut, litter, basin perimeter, respectively, effective properties on soil loss by gully in the region were included in the prediction equation of soil loss with R2 of 0.837. Stepwise regression with the dependent variable of gully length showed that the relationship has R2 of 72.98% and is significant at the percentage level.