Faculty of Oceanography and Geography, Institute of Oceanography, University of Gdansk, Gdynia, Poland.
GIS Centre, University of Gdansk, Gdansk, Poland.
Environ Monit Assess. 2018 Aug 20;190(9):536. doi: 10.1007/s10661-018-6857-2.
Dissolved organic carbon (DOC) concentration and fluxes from four rivers draining the catchment of the Puck Lagoon in southern Baltic are presented. Water samples from rivers and coastal zone close to the rivers' mouth were collected from April 2015 to March 2017. DOC was measured using high temperature catalytic oxidation with an NDIR detection. DOC concentration in rivers as well as area specific load discharged to the lagoon reflected variations of land use along their course. Area specific load of DOC discharged by rivers with high proportion of forests, meadows, and pastures in the catchment was significantly higher as compared to rivers with catchment dominated by arable land. However, the main controlling factor of the total discharged loads of DOC was the water flow. The highest loads were observed during the downpour. That was due to the larger volumes of water transported with rivers and the higher concentration of DOC resulting from increased leaching from the catchment area. The obtained results are especially important in the light of climate change in the southern Baltic region. According to the forecasts, we can expect increased precipitation and flooding and consequently increased leaching from the catchment and transport of DOC to the sea via rivers.
本文介绍了波罗的海南部普克泻湖流域四条河流的溶解有机碳（DOC）浓度和通量。2015 年 4 月至 2017 年 3 月期间，从河流和靠近河口的沿海地区采集了水样。DOC 采用高温催化氧化和 NDIR 检测法进行测量。河流中的 DOC 浓度以及排入泻湖的区域特定排放量反映了其流经地区土地利用的变化。与流域以耕地为主的河流相比，流域内森林、草地和牧场比例较高的河流的 DOC 区域特定排放量明显更高。然而，DOC 总排放量的主要控制因素是水流。最大的排放量出现在暴雨期间。这是因为与河流一起输送的水量增加，以及流域淋溶增加导致 DOC 浓度升高。考虑到波罗的海南部地区的气候变化，获得的结果尤为重要。根据预测，我们可以预期降水和洪水增加，从而导致流域淋溶增加以及通过河流向海洋输送的 DOC 增加。
