Dissolved organic carbon analyzer

溶解有机碳(DOC)在地表水化学和生态学中起着重要作用，DOC浓度的变化趋势也与陆地碳库的变化有关。最近，一些研究报告说，表层水中DOC的浓度正在增加，并提出了各种潜在的区域尺度驱动因素，包括二氧化碳(CO2)增加、气候变暖、水文变化、持续的氮沉积和减少的硫酸盐沉积。在我们位于安大略省中南部的研究地点，已经观察到DOC浓度的积极趋势，我们已经确定了一些可测试的假设来解释这些趋势。DOC浓度和通量随时间的变化也会影响流域中痕量金属的移动、酸化的恢复以及湖泊中二氧化碳的释放。该提案寻求资金购买DOC分析仪，使我们能够测量水样中的DOC浓度，并了解(A)DOC浓度趋势的驱动因素，以及(B)DOC变化对森林流域的影响(S)。

Dissolved organic carbon (DOC) plays an important role in surface water chemistry and ecology and trends in DOC concentration also have been associated with shifts in terrestrial carbon pools. Recently, a number of studies have reported that DOC concentrations in surface waters are increasing, and a variety of potential regional-scale drivers have been proposed, including increasing carbon dioxide (CO2), climate warming, hydrologic change, continued nitrogen deposition and decreased sulphate deposition. Positive trends in DOC concentration have been observed at our study sites in south-central Ontario, and we have identified a number of testable hypotheses to explain these trends. Changes in DOC concentration and flux over time also impact trace metal movement in catchments, recovery from acidification and CO2 evolution from lakes. This proposal seeks funds to purchase a DOC analyzer, which will allow us to measure DOC concentrations in water samples and understand (a) the drivers of trends in DOC concentration, and (b) the implication(s) of changes in DOC for forested catchments.