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首页> 外文期刊>Journal of environmental sciences >Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies
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Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies

机译：光生物降解及生物降解对多种地表水体溶解有机质生物地循环的影响

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The objective of this research was to quantify the temporal variation of dissolved organic matter (DOM) in five distinct waterbodies in watersheds with diverse types of land use and land cover in the presence and absence of sunlight. The water bodies were an agricultural pond, a lake in a forested watershed, a man-made reservoir, an estuary, and a bay. Two sets of samples were prepared by dispensing unfiltered samples into filtered samples in 1:10 ratio (V/V). The first set was exposed to sunlight (10?hr per day for 30?days) for examining the combined effect of photo-biodegradation, while the second set was stored in dark for examining biodegradation alone. Spectroscopic measurements in tandem with multivariate statistics were used to interpret DOM lability and composition. The results suggest that the agricultural pond behaved differently compared to other study locations during degradation experiments due to the presence of higher amount of microbial humic-like and protein-like components derived from microbial/anthropogenic sources. For all samples, a larger decrease in dissolved organic carbon (DOC) concentration (10.12%?±?9.81% for photo-biodegradation and 6.65%?±?2.83% for biodegradation) and rapid transformation of DOM components (i.e., terrestrial humic-like components into microbial humic and protein-like components) were observed during photo-biodegradation experiments. Results suggest that sunlight facilitated DOM biodegradation, resulting in simpler recalcitrant molecules regardless of original composition. Overall, it was found that combined effects of light and bacteria are more efficient than bacterial effects alone in remineralizing and altering DOM, which highlights the crucial importance of sunlight in transforming aquatic DOM.
机译：该研究的目的是通过不同类型的土地利用和阳光下的土地使用和陆地覆盖，量化在流域中五种不同水资源同样的溶解有机物质（DOM）的时间变异。水体是农业池塘，一个森林分水岭，一个人造水库，河口和海湾。通过将未滤器的样品分配在1:10的比例（v / v）中将未滤器的样品分配到过滤的样品中来制备两组样品。第一组暴露于阳光（每天10℃，30？天），用于检查光生物降解的综合效果，而第二组储存在黑暗中以单独检查生物降解。使用多元统计数据串联的光谱测量来解释DOM损伤和组成。结果表明，由于存在较高量的微生物腐殖液和蛋白质的组分，与衍生自微生物/人为源的蛋白质样组分的存在相比，农业池在降解实验期间与其他研究位置相比不同。对于所有样品，溶解的有机碳（DOC）浓度的较大减少（10.12％？±±9.81％，用于光生物降解，生物降解的6.65％？±2.83％）和DOM组分的快速转换（即，陆地腐殖质 - 在光生物降解实验期间观察到在光纤生物降解实验期间观察到微生物腐殖液和蛋白质组分的组分。结果表明，阳光促进了DOM生物降解，导致乙醛分子更简单，无论原始组合物如何。总的来说，发现光和细菌的组合效果比单独的细菌效应更有效，并改变DOM，这突出了阳光在转化水生DOM中的重要性。

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