The effect of severe drought on the dissolved organic carbon (DOC) concentration and flux from British rivers
The effect of severe drought on the dissolved organic carbon (DOC) concentration and flux from British rivers
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DOI：
10.1016/j.jhydrol.2008.07.051
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发表时间：
2008-11-15
影响因子：
6.4
通讯作者：
Burt, T. P.
中科院分区：
文献类型：
--
作者：
Worrall, F.;Burt, T. P.
严重干旱对溶解有机碳（DOC）产生的生物地球化学影响可能解释了整个北半球亚北方流域DOC通量和浓度普遍增加的现象。它将DOC增加的模式和程度与严重干旱的模式和程度进行了比较。它还考虑了可获得的DOC记录期间两次最严重干旱的影响，并包括来自97个站点的DOC记录。本研究导出了五种不同的干旱严重程度指数，并将其与每次严重干旱后4年期间观测到的DOC增加进行了比较。结果表明，干旱指数与DOC浓度和通量的变化趋势没有明显的相关性。在经历严重干旱的地区，甚至在泥炭覆盖的集水区，观察到DOC的通量和浓度都在下降。通过方差分析和多元线性回归分析，没有发现严重干旱后DOC增加的一致性或显著性模式。这项研究并不排除干旱在引起观测到的DOC增加中的作用，但它表明干旱在DOC中的作用仅限于某些单独的集水区或一些泥炭覆盖的源头。(C) 2008 Elsevier B.V.版权所有
The effect of severe drought on the biogeochemistry of dissolved organic carbon (DOC) production has been proposed as a possible explanation of the widespread observed increase in the flux and concentration of DOC in sub-boreal catchments across the northern hemisphere. It compares the pattern and extent of DOC increases to the pattern and extent of severe droughts. It also considers the effect of the two most severe droughts during the period of the available DOC records and includes DOC records from 97 sites. This study derives five different drought severity indices and compares these to the observed increase in DOC over the 4-year period after each severe drought. The results show no visual correlation between drought indices and trends in either DOC concentration or flux. Decreasing DOC fluxes and concentrations were observed in the areas that had experienced severe droughts, even in peat-covered catchments. Using analysis of variance (ANOVA) and multiple linear regressions, no consistent or significant pattern of DOC increase after severe drought could be distinguished. This study does not exclude a role for drought in causing the observed DOC increases, but it suggests that the role of drought in DOC is limited to some individual catchments or some peat-covered headwaters. (C) 2008 Elsevier B.V. All rights reserved.