The channel‐source hypothesis: Empirical evidence for in‐channel sourcing of dissolved organic carbon to explain hysteresis in a headwater mountain stream
The channel‐source hypothesis: Empirical evidence for in‐channel sourcing of dissolved organic carbon to explain hysteresis in a headwater mountain stream
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河道源假说：溶解有机碳在河道内的来源以解释源头山涧中的滞后现象的经验证据
DOI：
10.1002/hyp.14570
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发表时间：
2022
影响因子：
3.2
通讯作者：
Ward, Adam S.
中科院分区：
文献类型：
--
作者：
Wondzell, Steven M.;Ward, Adam S.
流域水文学家长期以来一直困惑于这样一个问题：流域如何能迅速产生风暴流和溶质脉冲，以应对风暴事件？概念模型将集水区视为由离散的源区组成，这些源区在独特的时间尺度上产生流量，并具有独特的化学特性，这些模型已被用来解释所观察到的流量和水化学变化。令人惊讶的是，这些概念模型通常不把河道作为潜在的源区之一。在这里，我们提出了渠道源假说，其中流本身应被视为一个潜在的源，具有与其他贡献领域相同的严格性。我们提出这一点是出于科学使用这个词的精神：一个假设不是一个被证明的想法，而是一个临时的假设，作为进一步研究的基础。我们建议，该通道应被视为溶解有机碳（DOC）的潜在来源。河道储存了大量的有机物，河流生态学家长期以来一直在研究河流的碳循环。从这些研究中，我们知道，淋溶和分解可以从颗粒有机碳（POC）中产生DOC。此外，POC储存在通道“死区”-低流速区域-可以随着流速增加而激活，从而在风暴期间释放累积的DOC。所有的集水区都是不同的;没有理由认为在每个集水区、每个风暴中，渠道来源总是重要的。因此，渠道来源假说并不能取代现有的概念模型。相反，它增加了另一个潜在的机制，可以解释DOC动态观察流。通道源假说有重大影响的集水区研究检查来源的DOC在流水或使用DOC作为示踪剂，以确定的位置，和比例的贡献，不同的源区径流生成。
Catchment hydrologists have long puzzled over the question: How can catchments rapidly generate storm flows and pulses of solutes in response to storm events? Conceptual models viewing catchments as composed of discrete source areas generating flow at unique time scales and with unique chemical characteristics have been used to explain the observed changes in flow and water chemistry. Surprisingly, those conceptual models usually do not treat the stream channel as one of the potential source areas. Here, we propose thechannel‐source hypothesisin which the stream itself should be considered as a potential source with the same rigour as other contributing areas. We pose this in the spirit of the scientific use of the word: a hypothesis is not a proven idea but rather a provisional supposition serving as the basis for further study. We suggest that the channel should be considered as a potential source for dissolved organic carbon (DOC). Channels store substantial amounts of organic matter, and stream ecologists have long studied stream carbon cycling. From those studies, we know that leaching and decomposition can generate DOC from particulate organic carbon (POC). Further, POC is stored in channel ‘dead‐zones’—regions of low flow velocity ‐ that can be activated as flow velocity increases, thus releasing accumulated DOC during storms. All catchments are different; there is no reason to assume that channel sources are always important, in every catchment, in every storm. Thus, the channel‐source hypothesis does not replace existing conceptual models. Instead, it adds another potential mechanism that may explain DOC dynamics observed in streams. The channel‐source hypothesis has substantial implications for catchment studies examining sources of DOC in stream water or using DOC as a tracer to determine the locations of, and proportional contributions of, different source areas for streamflow generation.
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陡峭森林流域中局部和非局部因素对土壤含水量的影响
影响因子：
5.4
作者：
Jarecke, Karla M.;Bladon, Kevin D.;Wondzell, Steven M.
通讯作者：
Wondzell, Steven M.
影响因子：
4
作者：
Buffam, I;Galloway, JN;McGlathery, KJ
通讯作者：
McGlathery, KJ
影响因子：
3.7
作者：
Argerich, Alba;Haggerty, Roy;Thomas, Christoph K.
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Thomas, Christoph K.
用于物理和化学分析的地表水和床质样品的收集和处理方法
DOI：
--
发表时间：
1990
期刊：
影响因子：
--
作者：
J. Ward;C. Harr
通讯作者：
C. Harr
影响因子：
4.8
作者：
Hotchkiss, Erin R.;Hall, Robert O., Jr.
通讯作者：
Hall, Robert O., Jr.