Water quality effects of clearcut harvesting and forest fertilization with best management practices

Journal of Environmental Quality
M W McBroomGeorge G Ice

Abstract

Nine small (2.5 ha) and four large (70-135 ha) watersheds were instrumented in 1999 to evaluate the effects of silvicultural practices with application of best management practices (BMPs) on stream water quality in East Texas, USA. Two management regimes were implemented in 2002: (i) conventional, with clearcutting, herbicide site preparation, and BMPs and (ii) intensive, which added subsoiling, aerial broadcast fertilization, and an additional herbicide application. Watershed effects were compared with results from a study on the same small watersheds in 1981, in which two combinations of harvesting and mechanical site preparation without BMPs or fertilization were evaluated. Clearcutting with conventional site preparation resulted in increased nitrogen losses on the small watersheds by about 1 additional kg ha(-1) each of total Kjeldahl nitrogen (TKN) and nitrate-nitrogen (NO(3)-N) in 2003. First-year losses were not significantly increased on the large watershed with a conventional site preparation with BMPs. Fertilization resulted in increased runoff losses in 2003 on the intensive small watersheds by an additional 0.77, 2.33, and 0.36 kg ha(-1) for NO(3)-N, TKN, and total phosphorus, respectively. Total loss rates of ammon...Continue Reading

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Citations

Dec 31, 2010·Environmental Management·Christopher J Anderson, B Graeme Lockaby
Oct 27, 2009·Environmental Management·Craig LoehlePhilip Weatherford
Oct 6, 2015·Journal of Environmental Quality·A MuwambaS Tian
Jan 6, 2010·Journal of Environmental Quality·Bray J BeltranJami E Nettles
Aug 3, 2021·Journal of Geophysical Research. Biogeosciences·Jiajia LinJill S Baron

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