Swedish University of Agricultural Sciences, Department of Environmental Assessment, SE 750 07 Uppsala, Sweden.
Environ Pollut. 2010 Dec;158(12):3552-9. doi: 10.1016/j.envpol.2010.08.016. Epub 2010 Sep 22.
Short-term increases in soil solution nitrate (NO(3)(-)) concentration are often observed after forest harvest, even in N-limited systems. We model NO(3)(-) leaching below the rooting zone as a function of site productivity. Using national forest inventories and published estimates of N attenuation in rivers and the riparian zone, we estimate effects of stem-only harvesting on NO(3)(-) leaching to groundwater, surface waters and the marine environment. Stem-only harvesting is a minor contributor to NO(3)(-) pollution of Swedish waters. Effects in surface waters are rapidly diluted downstream, but can be locally important for shallow well-waters as well as for the total amount of N reaching the sea. Harvesting adds approximately 8 Gg NO(3)-N to soil waters in Sweden, with local concentrations up to 7 mg NO(3)-N l(-1). Of that, ∼3.3 Gg reaches the marine environment. This is ∼3% of the overall Swedish N load to the Baltic.
森林采伐后，土壤溶液中硝酸盐（NO3-）浓度通常会短期增加，即使在氮限制系统中也是如此。我们将根区以下的硝酸盐淋溶建模为站点生产力的函数。利用国家森林清查和河流及河岸带氮衰减的已发表估算值，我们估算了仅采伐树干对地下水、地表水和海洋环境中硝酸盐淋溶的影响。仅采伐树干对瑞典水域硝酸盐污染的影响较小。在地表水，影响会迅速向下游稀释，但对于浅层水井和到达海洋的总氮量，影响可能在局部地区很重要。采伐使瑞典土壤水中增加了约 8 克 NO3-N，局部浓度高达 7 毫克 NO3-N l-1。其中，约 3.3 克到达海洋环境。这约占瑞典对波罗的海氮负荷的 3%。
