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\section*{Introduction}  More frequent Wildfires are a natural phenomenon but human activities are altering both the driving factors (climate)  and severe wildfires the vulnerability (land-use factors) of ecosystems, increasing both frequency and severity of fire impacts. The boreal zone has experienced an intensified fire regime over the last decades and this trend  is a direct response predicted  to climate change. Sweden experienced continue \cite{flannigan_impacts_2009}. This is  an example issue of concern given that wildfires play a major role in altering nutrient status  of soils and waters. Yet, few studies have investigated the impact boreal wildfires have on water quality and how  this is altered by land-use and landscape characteristics. Here we address this topic by capitalizing on a wildfire in Sweden that occurred  in2014 when  a 14 000 ha large managed  areaburned only 150 km from Stockholm. This likely also true for areas, like Scandinavia,  with a modern history of few multiple catchments  and small wildfires. This an ongoing water quality monitoring program.  Acidification still exerts a major control on surface water quality.   Forest fires have had significant impacts on surface water quality in other areas around world, most recently in Norway.   The fire in the area of Västmanlands län affected an area that is dominated by wetlands. This allows analyzing how forest practice such as ditching, age distribution or tree density affect fires severity and fire spreading.   Increased forest production may be counteracted by increased CO2 release through fires due to management practices such as ditching wetlands.  WHAT HAPPENS IN WATERS?  -WHAT DETERMINES WATER QUALITY IN BOREAL LANDSCAPE NORMALLY?  -FIRE WE KNOW  After fire there is an increase of available nutrients in the soil, mainly caused by an increase in soil pH which is associated to an increase in exchangeable cations in soil \cite{gonzalez-perez_effect_2004}. Soil organic nitrogen is either volatilised or largely converted into inorganic forms (i.e. NH+4 and NO-3). Nitrite is mainly formed from NH+4 through nitrification up until months after the fire (Covington and Sackett 1992). Both NH4+–N and NO3–N are available to plants, but with a sparse or non-existing vegetation cover after a severe fire, these compounds are leached out. Although, ammonium is assumed to be held by the soil because it adsorbed onto negatively charged surfaces of soil particles (Mroz et al.1980), a study observed a NH+4 pulses that lasted over 3 growing seasons (Grogan et al. (2000) ).  -ACID  -LOSSES...eg N,P, CATIONS  Fire can also transform organic N to inorganic forms that are available to plants, but with poorly developed post-fire plant communities, this N can be easily exported to streams and lakes (Smith 2011)(  WHAT INFO IS MISSING?  -BEFORE AFTER EXP  -LONG TERM DATA  -FACTORS DETERMINING FIRE EFFECTS  -EARLY MEASUREMENTS  THIS PAPERS AIM AND NOVELTY  -  The overarching goal of this study is to investigate the short-term (12 months) effects of the 2014 Swedish wildfire on stream and lake water chemistry. Downstream data from seven burned watersheds and two reference (unburned) watersheds are presented together with data from ten lakes. In addition, pre-fire data exist for two of the streams in the burned area, making this a unique opportunity to quantify the impact of the wildfire on water chemistry. Furthermore, we want explore if catchment characteristics can be associated with the post-fire water chemistry. In particular we tested the variables: i) the proportion of severely burned upland, ii) proportion drained peatlands (i.e. treed peatlands), iii) proportion of open (i.e. undrained) peatlands. Overall classification of burn severity in uplands and peatlands are determined by remote sensing techniques.