ESTIMATION OF AGROFORESTRY LAND EROSION BASED ON THE WATER EROSION PREDICTION PROJECT (WEPP) APPLICATION

Abstract

The existence of land productivity is decreasing day by day, this is caused by the rate of erosion. The characteristics of agroforestry land those are not suitable for its designation will also result in decreased land productivity. Increasing the rate of erosion can make sedimentation in rivers and reservoirs more and more. Villages in the Pujon Malang sub-district include villages that are in landslide-prone areas and most of them are at high risk of landslides, droughts, and flash floods. This study aims to identify the value of erosion on agroforestry land based on the WEPP application and to identify the value of the classification of erosion hazard classes resulting from the erosion estimation using the WEPP application. Primary data collection in the field includes soil sample data in the form of soil texture, soil depth, albedo, percentage of sand, percentage of clay, percentage of organic matter, value, exchange capacity, % rock, and albedo. Secondary data in the form of rainfall data, topography, soil types, and land use. The total value of the erosion rate that occurred was 657,700 tons/ha. The total erosion value comes from 364.715 tons/ha for agricultural land, 8.898 tons/ha for agroforestry land as much as 283,200 tons/ha for settlements, and forest land for as much as 0.882 tons/ha. The total value of soil erosion that occurred was 657,700 tons/ha. The erosion value belongs to the Erosion Hazard Class V including very heavy erosion.

Keywords

• erosion
• water erosion prediction project (wepp)
• agroforestry