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PERANAN AGROFORESTRI DALAM MEMPERTAHANKAN FUNGSI HIDROLOGI DAERAH ALIRAN SUNGAI (DAS)

PERANAN AGROFORESTRI DALAM MEMPERTAHANKAN FUNGSI HIDROLOGI DAERAH ALIRAN SUNGAI (DAS),Meine van Noordwijk,Fahmuddin Agus,Didik Suprayogo,Kurniatun Hai

PERANAN AGROFORESTRI DALAM MEMPERTAHANKAN FUNGSI HIDROLOGI DAERAH ALIRAN SUNGAI (DAS)  
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ABSTRACT After a century of attention for ‘watershed management’ there is still a remarkable,lack of clear criteria and indicators of the hydrological functions that society expects to be met from water catchment areas. The lack of realistic expectations,leads to large public,investments,in ‘reforestation’ that are unlikely to achieve value for the money spent. Hydrological functions of watersheds, given the rainfall that the area receives, include the capacity to (1) Transmit water, (2) Buffer peak rain events, (3) Release water gradually, (4) Maintain water quality, (5) Reduce mass wasting (such as landslides), (6) Reduce soil erosion, and (7) Maintain micro climate. The relation between,full (‘forest’) and partial (‘agroforestry’)tree cover and hydrological functions in this sense involves changes at different time scales between total water yield and the degree of buffering of peak river flows. The role of land use can be analyzed in terms of changes in evapotranspir ation linked to the presence of trees, infiltration linked to conditions of the soil and the rate of drainage linked to the drain network,in the landscape. Models that link the dynamics,of macropores in the soil and the space-time characteristics of rainfall to the dynamics,of river flow can fairly well reproduce the time series of data of watershedhydrological,functions from intensively studied (sub)catchments. We may,thus have some,confidence,in their use for extrapolation to
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