Hubungan Kedekatan Ekologis Antara Fauna Tanah Dengan Karakteristik Tanah Gambut Yang Didrainase Untuk Hti Acacia Crassicarpa (Ecological Proximity Relationship Between Soil Fauna and the Characteristics of Drained Peatland for Industrial Plantation)

摘要

Management of peatlands for HTI cultivation of Acacia crassicarpa begins by making drainage ditches and land clearing, followed by the preparation of land for planting. As for the maintenance activity, it includes weed control using herbicides and fertilizer. Management and maintenance activities certainly have implications for the ecological condition of peatlands, where the changes in ecological conditions due to land conversion will impact the abundance and diversity of soil fauna. Abundance and diversity of soil fauna and ecosystem function showed a very complex relationship not widely known this far. Soil fauna tendency to select certain habitat is affected by several ecological factors, both biotic and abiotic. The study aims to assess the ecological proximity between the characteristics of peatland drained for HTI cultivation of A. crassicarpa and the abundance of soil fauna. The study was conducted in HTI peatlands of PT. Arara Abadi, Rasau Kuning District, Siak Regency, Riau. Soil fauna sampling was conducted by taking soil sample of 25 x 25 x 25 cm in size. Separation of soil fauna from the soil was performed by a modification to a barlese funnel. Observed variables were the abundance and the diversity of soil fauna, peat maturity (C/N), water contentof peatand ground water table. For observing ecological proximity, hierarchical analysis was used. Result showed that the highest of soil fauna abundance was found in A. crassicarpa stand, 2 year\u27s old of age. The species diversity of soil fauna in research location included as medium abundant by H\u27 value 1,2. Formicidae was potential become a low level-humidity bioindicators of peatsoil, which described by those pattern : low water content and higher level of peat maturity. Entomobryidae was potential become a high water content bioindicator and low level of peat maturity.