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Dissolved organic carbon in eastern Canadian lakes: Novel patterns and relationships with regional and global factors.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.scitotenv.2020.138400
Md Noim Imtiazy 1 , Andrew M Paterson 2 , Scott N Higgins 3 , Huaxia Yao 2 , Suzanne Couture 4 , Jeff J Hudson 1
Affiliation  

Long-term patterns in dissolved organic carbon (DOC) concentrations in 49 eastern Canadian lakes from four sites were re-examined with a ~ 35-year (~1980-2015) dataset. The study sites were Dorset (number of lakes, n = 8), Experimental Lakes Area (ELA, n = 4), Kejimkujik (n = 26) and Yarmouth (n = 11). Lake DOC patterns were synchronous within each site. However, comparisons of DOC patterns across sites showed that they were synchronous only between the Kejimkujik and Yarmouth locations. Hence, these two sites were pooled into a single Nova Scotia site (NS). Increases in DOC concentration were evident in Dorset, Ontario from 1988 (r2 = 0.78, p < 0.001) and NS from 2000 (r2 = 0.43, p = 0.006). DOC at the ELA in northwestern Ontario had a different pattern compared to the other sites, i.e., DOC had increased earlier (1983-2000), and then, unlike Dorset and NS, neither an increase nor decrease was detected between 2001 and 2015 (p = 0.78). Precipitation and sulfur deposition explained the greatest variance in DOC patterns at the Dorset and NS sites (i.e., precipitation: 21-49% and sulfur deposition: 24-54%). Precipitation was the most important driver of DOC at the ELA. Our results indicate that all the sites have gone through a process of increasing DOC, but at different times. The stabilizing pattern at the ELA since 2001 may suggest that DOC concentrations in ELA lakes have reached, or are approaching a new equilibrium, a phenomenon that was not observed at the other sites. Also, the increase in DOC was not always associated with declining sulfur deposition (e.g., ELA). Therefore, we conclude that there was considerable variation in DOC patterns across this large geographic region of Canada and potential drivers of these patterns were not consistent across these diverse sites.

中文翻译:

加拿大东部湖泊中溶解的有机碳:新颖的模式以及与区域和全球因素的关系。

用〜35年(〜1980-2015)数据集重新检查了来自四个地点的加拿大东部49个湖泊中溶解有机碳(DOC)浓度的长期模式。研究地点为多塞特郡(湖泊数量,n = 8),实验湖泊区(ELA,n = 4),凯吉姆库吉克(n = 26)和雅茅斯(n = 11)。Lake DOC模式在每个站点内都是同步的。但是,跨站点的DOC模式比较显示,它们仅在Kejimkujik和Yarmouth位置之间是同步的。因此,这两个站点合并为一个新斯科舍站点(NS)。1988年以来,安大略省多塞特郡(DOC = 0.78,p <0.001)明显增加了DOC的浓度,而2000年以来又出现了NS(r2 = 0.43,p = 0.006)的NS明显增加。与其他站点相比,安大略省西北部ELA的DOC模式有所不同,即DOC的增长较早(1983-2000年),然后,与多塞特郡(Dorset)和北卡罗来纳州(NS)不同,在2001年至2015年期间未发现上升或下降(p = 0.78)。降水和硫沉积解释了多塞特郡和NS地点DOC模式的最大变化(即降水:21-49%,硫沉积:24-54%)。降水是ELA中DOC的最重要驱动力。我们的结果表明,所有站点都经历了增加DOC的过程,但时间有所不同。自2001年以来ELA的稳定模式可能表明ELA湖泊中的DOC浓度已达到或接近新的平衡,这一现象在其他地点未曾观察到。同样,DOC的增加并不总是与硫沉积的下降有关(例如ELA)。因此,
更新日期:2020-04-08
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