دانلود رایگان مقاله انگلیسی مواد آلی در دریاچه های کوچک سیخوته آلین اندوخته زیستکره - نشریه الزویر

Abstract

The carbon concentration and distribution in dissolved organic matter (DOM) and particulate organic matter (POM) in the lagoon lakes Blagodaty and Golubichnoe located in the Sikhote-Alin Nature Reserve and Lake Vaskovskoye оf the Dalnegorsk urban district of Primorsky Krai were analysed using data collected in July–August of 2011–2014. The content of DOM carbon ranged from 1.9 to 8.6 mg/l, representing 68–90% of the total organic carbon. Reductions in the POM carbon concentration and organic carbon percentage of the particulate matter in the sequence of the lakes Blagodaty–Golubichnoe–Vaskovskoye were determined. Analysis of the SUVA254 dynamics and the fluorescence intensity revealed a trend of simplification of the molecular structure of DOM from the surface to a depth of 1 to 1.5 m in lakes Golubichnoe and Vaskovskoye as well as at the northern station in the brackish Blagodaty Lake

Results and Discussion

In 2011–2014, the hydrological situation in the area was quite dynamic (Weather report RP5). The spring and summer of 2012 followed the dry winter of 2011. However, there was abundant rainfall in Primorye in the autumn of 2012, and the soils were humid in the first half of 2013. Therefore, when a cyclone brought more than 670 mm of rain in many areas of the southern Far East in July, 2013, catastrophic floods followed. According to our estimates, the rise of the water level in Vaskovskoe Lake was approximately 2 m. Flooding was caused in part because large amounts of water were dropped during this time from the Dalnegorsk reservoirs into the Rudnaya River, where a creek flows from the lake. The concentration of total organic carbon varied between 2 and 12.2 mg/l. The highest content was found in the Blagodati and Golubichnoe Lakes due to the inflow of organic matter related to bog creation, and the lowest content was in the water of Vaskovskoe Lake (Table 2). The carbon content in DOM was 2.3–8.4 mg/l (average of 5.2 mg/l), and so 68–90% of the total carbon was found in the dissolved organic matter of the lakes.