Abstract
This study aimed to compare erosion rates on land with slope classes of <40% with those of slope classes> 40%, under pine stands and to determine the relationship between rainfall and erosion. The study was conducted during September 2016 until March 2017 and recorded 36 rain events. Measurement of rainfall using an observatory type rainfall. The amount of erosion is known through direct measurements in the field on the plot measuring 22 x 4 m and followed by the analysis of sediment samples in the laboratory. The measurement results in the field obtained the highest rainfall of 95.6 mm and the lowest of 2.7 mm with a total of 770.50 mm. Erosion is obtained from times result of the sediment concentration with the volume of samples accommodated in the container per thousand. The calculation result is known that the average of erosion on slope class> 40% is in the amount of 278.94 kg / ha and on slope class <40% is 94.93 kg / ha. The relationship of rainfall to erosion is Obtained through a simple regression analysis Y = -3.723 + 0.448x (R2 0.94), Y = -3.502 + 0.645x (R2 0.93), Y = -4.482 + 0.540x (R20.95), Y = -1.644 + 0.269x (R20.91), Y = 0.006 + 0.008x (R2 0.84), and Y = -1.497 + 0.239x (R2 0.90).
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