Carbon Deposition and Fluxes by Attached Aquatic Microbiota

这项研究评估了附着在水中的微生物群落 （附着生物）调节（1）沉积有机物的速率 从高地地区进口的碳或由 水生植物和藻类在这些地区，（2）保留 或有机碳的损失率。 微生物群实现了这一点 通过密集分解的组合调节， 溶解的有机碳转化为二氧化碳和甲烷， 微生物生物量的显著部分不分解。 高代谢和生长的结果，从密集的回收利用， 社区内的营养物质。 该研究计划将 在重复实验条件下研究自然群落 条件：（1）代谢和社区碳保留， 分解为CO2和甲烷。 （二） 对磷和氮的营养限制的抗性， 对碳损失的影响。 (3)不同类型的影响 溶解有机化合物对代谢循环和碳 损失 (4)大气侧微尺度通量的测定 这些附着群落中的营养物质。 %%% 湿地/沿岸的和洪泛平原水陆交界区 湖泊和河流生态系统被认为是 有机碳沉积区。 有机碳储量 相对于以CO2形式的代谢碳的演变， 甲烷之所以重要，是因为这些“温室气体” 对全球气候变化评估至关重要。***//

This research evaluates how attached aquatic microflora (periphyton) regulate (1) the rates of deposition of organic carbon that is imported from upland areas or synthesized by aquatic plants and algae in these regions , and (2) the retention or loss rates of organic carbon. The microbiota accomplish this regulation by a combination of intensive decomposition of dissolved organic carbon to CO2 and methane and by burying a significant portion of microbial biomass that does not decompose. High metabolism and growth results from intensive recycling of nutrients within the communities. The research program will examine natural communities under replicated experimental conditions for: (1) Metabolic and community carbon retention and decomposition to CO2 and methane in response to substratum. (2) Resistance to nutrient limitations of phosphorus and nitrogen and the effects on carbon losses. (3) Effects of different types of dissolved organic compounds on metabolic recycling and carbon losses. (4) Determination of lateral microscale fluxes of nutrients within these attached communities. %%% Wetland/ littoral and floodplain land-water interface regions of lake and river ecosystems are being recognized as major depositional areas for organic carbon. Organic carbon storage versus evolution of metabolized carbon in the form of CO2 and methane is important because these 'greenhouse' gases are critical to global climate change evaluations. ***//