Identification Of Degraded Dry Land In The Citarum Watershed, West Java Province, Indonesia

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Abstract

Estimation of the level of land degradation and its distribution is essential for regional development. This study aims to identify both physical and chemical degraded land in intensive, conventional farming, with different cropping patterns in the Citarum watershed. The method used in this research is island grade and degraded land assessment, referring to Sodeg (2001) and UU Kurnia (2007) criteria. Soil Survey, LREP, 1988), Through weighting and scoring according to the intensity of their influence on degraded land. The level of land degradation and its distribution is obtained by analyzing the trigger parameters for the occurrence of degraded land. Data analysis was carried out utilizing land use/vegetation cover, slope, and annual average rainfall.


                     The results showed that the land area in the upstream Citarum watershed area was 307,904 ha consisting of 4,907 ha heavily degraded, 23,947 ha moderately degraded, 135,521 ha lightly degraded, and 143,529 ha not degraded. Soil analysis at all levels of degraded land in the upstream Citarum watershed shows that the C-organic levels are generally still relatively high - moderate. Soil permeability varies from moderately (6.35 – 12.7 cm/hour) to moderate (2.0 – 6.35 cm/hour).In some areas, moderate to heavily degraded land has become critical in undulating, hilly, and mountainous areas with slopes >15%. This land is generally overgrown with reeds, grass, and shrubs. In some places, it is dryland agriculture and mixed gardens whose growth is very stunted/skinny. Visible solid rock/parent material has emerged on the surface. This land has low productivity and is no longer productive.

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