Export of phosphorus and nitrogen from lodgepole pine (Pinus contorta) brash windrows on harvested blanket peat forests

摘要: Abstract Enhanced nutrient export from blanket peats and other peat soils after forest harvesting has been reported by several studies. As part of practices on afforested peat, harvest residues are utilized as brash mats to improve the soil carrying capacity against heavy machinery extract harvested timber roadside, before being collected together form windrows, between which second rotation trees planted. Three types experiments were conducted assess impact derived lodgepole pine forests, phosphorus (P) nitrogen (N) release in catchments. First, a field survey was 6 sites study easily extractable P N contents below windrows respective free areas. The dynamics when water flows windrow brash-free area assessed using laboratory flume Finally, role adjacent watercourses under conditions artificially isolated mini-catchments with without residues. showed that catchments significant source underneath act hot spots for receiving waters. may sink rather than during early stages their decomposition. However, more exported brash-covered areas, probable reason microbial activity mineralization increased brash. Forest management options windrowing should be developed studied decrease transport