Effect of planting sweetpotato on dry farmland with different gradient slopes on soil erosion in Three Gorgers Reservoir Region of Yangtze River

摘要

Under natural circumstances,research on soil erosion caused by different slopes and different cultivation methods indicated that A factor(cultivation method),B factor(gradient slope of dry farmland)and A×B interaction are all significantly different with dry weight of the eroded.As to dry weight of the eroded,‘Yuhsu 297’(A5),a moderate-vine variety and intercropping with corn,is significantly lower than other four cultivations methods；flat farmland(B1.0% gradient)is significantly lower than gradients of 35%(B4),25%(B3)and 15%(B2)；‘Yushu 297’(A5B1),intercropping with corn on flat farmland,is lower than other A×B interaction combinations.In each plot,fresh weight of vine and leaf has negative correlation with dry weight of the eroded(r value:-0.307～-0.766)；on 15% gradient slope,the correlation between them reached 5% significance；on 35% gradient slope,it reached 1% significance.