Sri Lanka - Valuation of Environmental Services in Sri Lanka : A Case Study of Soil and Watershed Benefits in the Southern Province

agricultural land agricultural production agricultural productivity agriculture aquaculture aquatic ecosystems arid lands basins biodiversity biological control biological diversity biological resources breeding grounds canals carbon case studies clay climate climate change coastal areas coastal communities coastal erosion coastal plains coastal zones common property conservation construction contingent valuation coral coral reefs creeks cropping systems crops dams data collection decision making drinking water dry season ecological zones economic analysis economic benefits economic development economic growth economic value ecosystems environmental conditions environmental degradation environmental flows environmental policies erosion erosion control estuaries export farmers farming fish fish stocks fisheries fishery management fishing flood control food production forestry forests fresh water freshwater fruits gauging industrial wastewater island lagoons lakes land area livelihoods livestock production mangrove mangrove forests mangrove swamps mangroves marine ecosystems market prices meadows national parks native species natural resources nitrogen nutrients organic matter peat permeability phosphate phosphorus plantations point source pollution pollutants ponds precipitation preservation production functions rainfall reclamation recycling reservoir reservoirs resource conservation resource management river basins runoff saline water salt water sand sea level seawater sediment sediment load sedimentation sewage sewage treatment shores soil conservation soil degradation soil erosion soil fertility soil productivity species stabilization streams sustainable development sustainable fisheries tidal marshes timber topography tsunami urea use value vegetation wages wastewater wastewater treatment water demand water management water pollution water quality water supply water table waterfalls watershed management watersheds wells wetlands wildlife willingness to pay