湿地溶解性有机质（DOM）源识别方法研究

湿地是位于水陆生态系统之间的重要生态交错带,而溶解性有机质(DOM)是陆地向水生生态系统输送营养物质的重要载体物质。湿地中DOM的来源分为内源和外源。对湿地中DOM的来源进行识别有助于认识湿地中营养物质的生物化学循环特征,从而进一步了解水陆生态系统之间的物质循环。目前,对湿地DOM进行源识别的方法较多。根据各种方法在研究中应用的广泛性和可用性,本文主要介绍了光学法、同位素法、C/N比值法和生物标志法在湿地DOM源识别中的应用。综合分析表明,光学法、同位素法和C/N比值法在湿地DOM源识别研究中的应用较多。近几年,由于生物标志物(特别是木质素)不仅能够对来源进行识别,而且对源的变化很敏感,因此生物标志法在湿地DOM源识别中的应用成为研究的热点。论文在分析各种湿地DOM源识别方法的基础上,指出了目前研究中存在的问题,并提出进一步研究的方向。

Research of the Source Identification Methods for Dissolved Organic Matter (DOM) in Wetland

Wetland is one of the important ecological zones which is located between aquatic and terrestrial ecosystems, and dissolved organic matter (DOM) is an important loading material for the transfer of nutrients from terrestrial to aquatic systems. The source of DOM in wetland is divided into autochthonous and allochthonous. Source identification of DOM in wetland can benefit to understand the features of biochemical cycles about nutrients in wetland, and then get more information about material circulation between aquatic and terrestrial ecosystem. At present, there are a number of methods to identify the source of DOM in wetland. According to extensiveness and availability of different methods in application, it is mainly introduced the optical method, isotope method, C/N ratio method and biomarker method in the source identification of DOM in wetland in this paper. The results show that optical method, isotopic method and C/N ratio method have been more frequently used in previous researches. In recent years, the biomarker method plays more and more important rule, because the biomarkers such as lignin can not only be used to identify the sources, but also be very sensitive to the changes of different sources. As a conclusion, advantages and disadvantages in present research are summarized, and it is pointed out the research way in the future based on the discussion above.