Atrazine and 2,4-D mineralization in relation to microbial biomass in soils of young-, second-, and old-growth riparian forests

摘要: Abstract Current agricultural practices are responsible for the deposition of unwanted quantities pesticides into streams throughout United States. Previous studies in riparian areas have shown that microbial communities capable degrading herbicides faster forest soils than pasture soils. This study tested influence age forests on herbicide degradation soil. Active and total fungal bacterial biomasses mineralization atrazine (2 chloro-4[ethylamino]-6[isopropylamino]S-triazine) 2,4-D (2,4-dichlorophenoxy-acetic acid) litter top 10 cm mineral soil were measured 20–40, 60–90, 120–300 years old three sites autumn, winter, spring, summer. active did not differ regardless age. In litter, biomass also with year, but spring was greater old-growth second- or young-growth samples, as both biomasses. Atrazine season, it second samples all seasons. Mineralization old- second-growth except winter; mineral-soil, those from younger types. Results indicate a capacity to degrade do such second-or forests. Management long rotations may tend increase protection lakes streams.