Agricultural Landscape Design to Provide Forage Based on Slope Units to Increase Landslide Resilience

Abstract

The objective of the research was to assess the steep slopes with high landslide risk and to design special vegetation patterns as agrosilvopastoral to increase landslide resilience and supply livestock to surrounding villages. The research was carried out in Pasir Madang Village, Sukajaya District, Bogor Regency, West Java. The village area was affected by valley-side erosion, which deepened further in former landslide areas at the foot of Mount Halimun Salak. Data were collected by interpreting aerial photographs and delineating morphological units of ancient landslides, slope units, and existing land uses. Field surveys were conducted to (1) verify the interpretation of aerial photographs and (2) identify and evaluate existing geomorphological processes. The results showed that the design of the agrosilvopatoral stabilizes landslides because it places trees and crops based on the morphological units of previous landslides. The slope units were divided into three zones: the highest elevation (>40°) is the protection zone, the second elevation (>30°) is the agroforestry zone and the lowest elevation with a smooth slope is the cultivation zone. The combination of trees and crops, especially vetiver, spread across the slope has various functions of increasing landslide resilience and supporting feed supply for livestock, especially sheep.