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|標題:||Hydrological characteristics of betel nut plantations on slopelands in central Taiwan||作者:||Cheng, J.D.
|關鍵字:||hydrological characteristics;betel nut plantations;interception;infiltration;erosion;streamflow||Project:||Hydrological Sciences Journal-Journal Des Sciences Hydrologiques||期刊/報告no：:||Hydrological Sciences Journal-Journal Des Sciences Hydrologiques, Volume 53, Issue 6, Page(s) 1208-1220.||摘要:||
Betel nut or betel palm (Areca catechu Linn) has become a major cash crop in southern and central Taiwan since the mid-1980s. Many slopeland fruit orchards and forests have been converted to betel nut plantations. The total area of betel nut plantations has increased over the past 30 years, reaching a peak of 56 542 ha in 1997. The public and conservation groups frequently express great concern over the potential negative hydrological impacts of betel nut plantations oil steep slopes. This investigation in central Taiwan examines the effects of hillslope betel nut plantations on hydrological processes. Differences in hydrological characteristics between plots planted with betel nut trees and those with other ground cover types were evaluated at two study sites. The tall, single-layer canopy and wide spacing between planted betel nut trees led to low interception losses, high throughfall and high net rainfall. Plots planted with betel nut trees had lower infiltration, higher surface runoff and higher erosion than forested sites. These hydrological characteristics can be related to factors such as crown cover, soil organic content and soil porosity in betel nut plantations. Strearnflow data from three gauged watersheds with different proportions of total area planted with betel nut showed that where greater proportions of total area were planted with betel nut trees, there were higher annual stream flow/rainfall ratios, higher specific peak flows, steeper recessions and higher peak flow/baseflow ratios. The results from this study suggest that, in general, betel nut trees are less desirable from the soil and water conservation viewpoints than natural forests.
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