Erosion and natural revegetation associated with surface land drains in upland peatlands

摘要: Open cut drains are the most frequently used drainage technique in peatlands and common throughout world. Land increase density promote enhanced coupling of hillslope sediment sources with streams. They may be major fine to peatland stream systems but data on drain production rare. Many now being dammed by humans, yet some revegetate naturally. This paper presents a survey erosion natural revegetation peat related variables such as slope, area shading. The also provides measured comparison flux from open drains, that have been blocked dams, undisturbed subcatchments, catchment outlet. Natural infilling was often found occur gentle slopes 4° were rarely infilled. Nick-point retreat at confluence observed. Revegetation uncommon where or incised into underlying mineral substrate. Where floor peat-based, much more common. floors affected overhanging vegetation, which provided Drain less than 60% shading tended greater vegetation cover 60–90% However, almost totally shaded (>90%) had greatest vegetation. intact suspended within catchments, 18·3% originating unblocked drained 7·3% area. winter quarter year important other seasons for producing sediment, even though precipitation totals not during this period. Drains intervals along their length using blocks very low yields. Even poorly water could still flow full course drain, 54 times drains. Copyright © 2007 John Wiley & Sons, Ltd.